Frequently Asked Audio Questions - Updated 18th Aug 2016
Posted: Sat Nov 09, 2013 7:17 am
For your convenience, I have arranged a listing of some of the more commonly asked questions regarding the Blackmagic Camera's audio functionality.
If you can't find the answer below, before you post a question, give the Search function a try, if for no other reason than to refine the scope of your question. Most of the time you'll find your question has already been answered. Reading other responses will also serve as good "research" for your own question.
If you can't find your answer via search, then no problem, post away! But if you're too lazy to search, then don't be surprised if your post doesn't get too many replies!
Finally... PLEASE use your full name when posting. The idea of this rule, which has existed since the creation of these forums, is that users who can be clearly identified will be more respectful than those who remain anonymous.
Happy Shooting!
P.S. There's a great thread here where Johannes Hoffmann chats about affordable and reasonable audio solutions for the BMCC.
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Please be aware that this thread is not associated with or endorsed by Blackmagic Design.
If you notice a mistake or something that's out-dated please let me know.
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GENERAL ADVICE:
READ THE MANUAL:
The manauls for all of Blackmagic's products are actually REALLY detailed, and REALLY easy to read. We highly recommend checking them out as a first point of call.
PHANTOM POWER:
It is standard practice to always plug in your XLR cable before switching phantom power on. Phantom power can also take quite a while to discharge after switching phantom power off on URSA Mini. Please be aware that you should wait a few minutes when switching off phantom power before plugging in any other microphones or XLR audio equipment.
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BLACKMAGIC URSA MINI:
Can I record decent audio on the Blackmagic Ursa Mini?
Yes - you can hear some tests here.
What audio inputs does the Blackmagic Ursa Mini have?
The Ursa Mini has 2 x XLR analog switchable between mic and line levels with Phantom power support.
What audio outputs does the Blackmagic Ursa have?
The Ursa has a 1/4” jack output for headphone monitoring.
There is also embedded stereo audio on the 12G-SDI output. The 12G-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Ursa Mini?
You can monitor levels on the touch screen.
Does the Blackmagic Ursa Mini come with a microphone?
Yes, the Ursa comes with an Integrated Stereo microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Ursa Mini have an Internal Speaker?
Yes, the Ursa Mini has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Ursa?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. When recording to Compressed RAW CinemaDNG, Uncompressed 48kHz 24bit audio is included in a standalone WAV file.
Does the Blackmagic Ursa Mini provide Phantom Power?
Yes, Phantom Power can be activated via the touch screen individually for both XLR inputs.
Does the Blackmagic Ursa Mini support external timecode?
Yes, the camera features a BNC Timecode/Reference Input.
Can I adjust the audio levels on the camera while recording?
Yes - it has physical knobs, but you can also adjust the gain via the touch screen.
How is the quality of the headphone output on the camera?
Much better than previous cameras - it's much less noisy. However, it's also very delayed from the picture, so it's very hard to monitor while you're shooting. It's great for calibration and confidence checking, and also playback.
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BLACKMAGIC URSA:
Can I record decent audio on the Blackmagic Ursa?
Yes - the Ursa records high quality audio.
What audio inputs does the Blackmagic Ursa have?
The Ursa has 2 x XLR analog switchable between mic and line levels with Phantom power support.
What audio outputs does the Blackmagic Ursa have?
The Ursa has a 1/4” jack output for headphone monitoring.
There is also embedded stereo audio on the 12G-SDI output. The 12G-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Ursa?
There is a massive audio meter on the right side of the camera. You can also monitor the audio via the touch screen.
Does the Blackmagic Ursa come with a microphone?
Yes, the Ursa comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Ursa have an Internal Speaker?
Yes, the Ursa has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Ursa?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. When recording to Compressed RAW CinemaDNG, Uncompressed 48kHz 24bit audio is included in a standalone WAV file.
Does the Blackmagic Ursa provide Phantom Power?
Yes, Phantom Power support was enabled in the 1.9.9 firmware release.
Does the Blackmagic Ursa support external timecode?
Yes, the camera features a BNC timecode in and timeout out as well as a Reference Input.
Can I adjust the audio levels on the camera while recording?
Yes.
How is the quality of the headphone output on the camera?
We have not personally tested the Ursa. If you have, let us know!
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BLACKMAGIC STUDIO CAMERA:
Can I record decent audio on the Blackmagic Studio Camera?
We haven't tested the Blackmagic Studio Camera. If you have, let us know!
What audio inputs does the Blackmagic Studio Camera have?
The Studio Camera has 2 x XLR analog switchable between mic and line levels with Phantom power support.
What audio outputs does the Blackmagic Studio Camera have?
The Studio Camera a Aviation headphone (Fixed Wing Plugs) output for talkback and audio monitoring.
There is also embedded stereo audio on the 3G-SDI output. The 3G-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Studio Camera?
We believe there will be on-board audio meters in a future software update.
Does the Blackmagic Studio Camera come with a microphone?
Yes, the Studio Camera comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Studio Camera have an Internal Speaker?
Yes, the Studio Camera has an Integrated mono speaker which can be used for audio playback on the camera.
Does the Blackmagic Studio Camera provide Phantom Power?
Yes. Some users have reported problems with it, however this has been addressed in the 1.8 firmware release.
Can I adjust the audio levels on the camera while recording?
Yes.
Does the Blackmagic Studio Camera have overload protection?
No.
How is the quality of the headphone output on the camera?
We won't know for certain until we get more feedback from users.
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BLACKMAGIC POCKET CINEMA CAMERA:
What audio inputs does the Blackmagic Pocket Cinema Camera have?
The BMPCC has 1 x 3.5mm stereo audio plug. Unlike the BMCC this input is UNBALANCED.
What audio outputs does the Blackmagic Pocket Cinema Camera have?
The BMPCC has a 1 x 3.5mm stereo headphone output for monitoring. There is also embedded audio on the HDMI output, meaning you could monitor the audio using a third-party product.
How do I monitor levels on the Blackmagic Pocket Cinema Camera?
From firmware release version 1.9.3, you now have audio meters on camera. You can also monitor levels via the embedded audio coming off the HDMI port. The HDMI signal contains Stereo 48kHz 24bit audio.
What are some examples of third-party video monitors or viewfinders that allow you to monitor audio from an embedded HDMI signal?
You could try the Cineroid EVF4RVW, TVLogic VFM-056WP, Ikan MD7, Kinotehnik LCDVFe or Alphatron EVF-035W-3G. You can also use SDI only monitors with a HDMI to SDI adapter.
Does the Blackmagic Pocket Cinema Camera come with a microphone?
Yes, the BMPCC comes with an Integrated Stereo microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Pocket Cinema Camera have an Internal Speaker?
Yes, the BMPCC has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Pocket Cinema Camera?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files.
Does the Blackmagic Pocket Cinema Camera provide Plug-in Microphone Power?
Yes, the Blackmagic Pocket Cinema Camera supplies plug-in power of 2.5V on the Microphone Port when Channel 1 and 2 are set to "Mic" in the menu. This has been tested with the Tascam TM-2X by a community member.
What are some examples of a small shotgun microphone that works with the Blackmagic Pocket Cinema Camera?
It's worth having a look at the Q DSLR-Video Microphone Kit (AUD$110). It's battery powered, so it doesn't require additional plug-in or phantom power. The Sony ECM-CG50 (AUD$$220.00) and Sennheiser MKE 400 (AUD$189.00) are two other battery powered options.
Does the Blackmagic Pocket Cinema Camera support external timecode?
The only way to record timecode to the BMPCC is to connect your timecode generator signal to one of the two audio inputs on the camera. You can then use DaVinci Resolve (9.0.3 and above), Avid Media Composer or Adobe Premiere CC to translate the audio timecode data into an additional timecode track, which can be used for syncing purposes. Final Cut Pro users can use 3rd party plugins such as AuxTC reader.
Can I adjust the audio levels on the camera while recording?
Yes, you can - however there will be a noticeable clicking in the recorded audio, and is therefore not recommended.
How is the quality of the headphone output on the camera?
Fairly poor. Our recommendation would be to listen to the audio feed on the HDMI signal.
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BLACKMAGIC PRODUCTION 4K:
Can I record decent audio on the Blackmagic Production Camera 4K
We've been able to get "decent" audio from the BMP4K on the 1.6.1 firmware using an external pre-amp. The frequency response issue doesn't exist on this camera (like it does on the BMCC on firmware previous to 1.8). We recommend using the latest 1.9.9 firmware, which addresses majority of the major audio concerns (including on-camera meters).
An external pre-amp/mixer is a given if you want to get good audio, regardless of what camera you're using. I wouldn't connect a ME66 directly to an Alexa ever if I was being serious with the audio - so you shouldn't expect you can just connect a ME66 directly to a BMC. Having said that - it WORKS - and you could connect a microphone directly to the camera as a guide track.
If you're doing anything that requires CRITICAL audio - then I'd still strongly suggest using an external audio recorder, and just use the BMP4K audio as a guide track and timecode reference. Even then, I'd still recommend a good external pre-amp/mixer.
What audio inputs does the Blackmagic Production Camera 4K have?
The BMP4K has 2 x 1/4” BALANCED jacks for professional analog audio, switchable between mic and line levels.
The BALANCED part is extremely important, because if you use incorrect cabling with the camera, due to the way balanced audio works (see above), the signal might cancel itself out. Balanced audio works on the principle that two identical signals which are opposite polarities (often erroneously called "out of phase") will cancel each other out. The cables used in such systems are designed to carry two versions of the signal and manipulate the polarities of these signals to eliminate noise.
What audio outputs does the Blackmagic Production Camera 4K have?
The BMP4K has a 1 x 3.5mm stereo headphone output for monitoring. There is also embedded audio on the HD-SDI output, meaning you could use a product such as the Blackmagic Audio Monitor to monitor levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Production Camera 4K?
From firmware release 1.9, you can now via audio levels on camera. You can also connect a Thunderbolt computer to the BMP4K, and monitor audio levels using UltraScopes, which is a software package included with the camera. Alternatively, you could also connect a product such as the SmartScope Duo 4K (or 3rd party products) and monitor the audio levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
What are some examples of third-party video monitors or viewfinders that allow you to monitor audio from an embedded SDI signal?
You could try the Cineroid EVF4CSS, TVLogic VFM-056WP, Ikan MD7 or Alphatron EVF-035W-3G. You can also use HDMI only monitors with a SDI to HDMI adapter.
Does the Blackmagic Production Camera 4K come with a microphone?
Yes, the BMP4K comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Production Camera 4K have an Internal Speaker?
Yes, the BMP4K has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Production Camera 4K?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. Eventually when RAW is released in a future firmware update, it will record Uncompressed 48kHz 24bit audio included in a standalone WAV file.
Does the Blackmagic Production Camera 4K provide Phantom Power?
No, it does not.
Does the Blackmagic Production Camera 4K support external timecode?
The only way to record timecode to the BMP4K is to connect your timecode generator signal to one of the two audio inputs on the camera. You can then use DaVinci Resolve (9.0.3 and above), Avid Media Composer or Adobe Premiere CC to translate the audio timecode data into an additional timecode track, which can be used for syncing purposes. Final Cut Pro users can use 3rd party plugins such as AuxTC reader.
Can I adjust the audio levels on the camera while recording?
Yes, you can - however there will be a noticeable clicking in the recorded audio, and is therefore not recommended.
How is the quality of the headphone output on the camera?
Fairly poor. Our recommendation would be to listen to the audio feed on the HD-SDI signal.
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BLACKMAGIC CINEMA CAMERA EF & MFT:
Can I record decent audio on the Blackmagic Cinema Camera EF/MFT?
We've been able to get "usable" audio from the BMCC on both the 1.2.1 and 1.3 firmware using an external pre-amp. Unfortunately though with both firmware releases you need to do some post-processing to make it sound "right". The 1.8 firmware however fixes the DC offset and frequency attenuation issues. We recommend using the latest 1.9.9 firmware, which addresses majority of the major audio concerns (including on-camera meters).
An external pre-amp/mixer is a given if you want to get good audio, regardless of what camera you're using. I wouldn't connect a ME66 directly to an Alexa ever if I was being serious with the audio - so you shouldn't expect you can just connect a ME66 directly to a BMC.
If you're doing anything that requires CRITICAL audio - then I'd still strongly suggest using an external audio recorder, and just use the BMC audio as a guide track and timecode reference. Even then, you still need a good external pre-amp/mixer.
What audio inputs does the Blackmagic Cinema Camera EF/MFT have?
The BMCC has 2 x 1/4” BALANCED jacks for professional analog audio, switchable between mic and line levels.
The BALANCED part is extremely important, because if you use incorrect cabling with the camera, due to the way balanced audio works (see above), the signal might cancel itself out. Balanced audio works on the principle that two identical signals which are opposite polarities (often erroneously called "out of phase") will cancel each other out. The cables used in such systems are designed to carry two versions of the signal and manipulate the polarities of these signals to eliminate noise.
What audio outputs does the Blackmagic Cinema Camera EF/MFT have?
The BMCC has a 1 x 3.5mm stereo headphone output for monitoring. There is also embedded audio on the HD-SDI output, meaning you could use a product such as the Blackmagic Audio Monitor to monitor levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Cinema Camera EF/MFT?
From the 1.9.3 firmware release, you can now monitor audio levels on-camera. You can also connect a Thunderbolt computer to the BMCC, and monitor audio levels using UltraScopes, which is a software package included with the camera. Alternatively, you could also connect a product such as the SmartScope Duo 4K (or 3rd party products) and monitor the audio levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
What are some examples of third-party video monitors or viewfinders that allow you to monitor audio from an embedded SDI signal?
You could try the Cineroid EVF4CSS, TVLogic VFM-056WP, Ikan MD7 or Alphatron EVF-035W-3G. You can also use HDMI only monitors with a SDI to HDMI adapter.
Does the Blackmagic Cinema Camera EF/MFT come with a microphone?
Yes, the BMCC comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Cinema Camera EF/MFT have an Internal Speaker?
Yes, the BMCC has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Cinema Camera EF/MFT?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. When recording to RAW 2.5K CinemaDNG, Uncompressed 48kHz 24bit audio is included in a standalone WAV file.
Does the Blackmagic Cinema Camera EF/MFT provide Phantom Power?
No, it does not.
Does the Blackmagic Cinema Camera EF/MFT support external timecode?
The only way to record timecode to the BMCC is to connect your timecode generator signal to one of the two audio inputs on the camera. You can then use DaVinci Resolve (9.0.3 and above), Avid Media Composer or Adobe Premiere CC to translate the audio timecode data into an additional timecode track, which can be used for syncing purposes. Final Cut Pro users can use 3rd party plugins such as AuxTC reader.
Can I adjust the audio levels on the camera while recording?
Yes, you can - however there will be a noticeable clicking in the recorded audio, and is therefore not recommended.
How is the quality of the headphone output on the camera?
Fairly poor. Our recommendation would be to listen to the audio feed on the HD-SDI signal.
Can I use the MixPre-D with the BMCC?
Yes - refer to this thread.
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GENERAL INFORMATION:
What is a DC offset?
DC offset is an offsetting of a signal from zero. If you look on an audio waveform it would mean that the waveform in default view appears not to be centered on the 0.0 horizontal line. A sound that has DC offset will not be at its loudest possible volume when amplified or normalized. This is because the offset reduces the headroom between the peak level of the audio and the maximum possible level without clipping. This problem can possibly extend to the mix as a whole, since a sound with DC offset and a sound without DC offset will have DC offset when mixed.
What is Line Level?
Line level is the specified strength of an audio signal used to transmit analog sound between audio components such as CD and DVD players, TVs, audio amplifiers, and mixing consoles. As opposed to line level, there are weaker audio signals, such as those from microphones and instrument pickups, and stronger signals, such as those used to drive headphones and loudspeakers. The strength of these various signals depends on the output voltage of the source device, along with its output impedance.
A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. The nominal level and the reference voltage against which it is expressed depend on the line level being used. While the nominal levels themselves vary, only two reference voltages are common: decibel volts (dBV) for consumer applications, and decibels unloaded (dBu) for professional applications.
The most common nominal level for consumer audio equipment is −10 dBV, and the most common nominal level for professional equipment is +4 dBu (by convention, decibel values are written with an explicit sign symbol).
The Blackmagic Cinema Camera's expect professional +4 dBu signals. If you're trying to get a -10 dBV signal into the camera, one easy way would to just leave the camera as Mic Level and use an in-line XLR pad to reduce the signal. Not ideal, as the pre-amp on the BMC is not great, but it would be a cheap and quick fix. Alternatively, you could use a pre-amp on the camera to boost the signal by 11.79dB.
Essentially if you plug a -10dBV output into a +4dBu input the signal is coming in 11.79dB quieter than the gear was designed for... so you need to turn something up. However, in all cases connecting a -10dBv output to the input of +4dBU gear will increase the noise floor.
What does Balanced Audio mean?
Balanced audio is a method of interconnecting audio equipment using balanced lines. This type of connection is very important in sound recording and production because it allows for the use of long cables while reducing susceptibility to external noise.
Balanced audio cables use an extra line, and consist of a hot line (positive), cold line (negative) and earth. The audio signal is transmitted on both the hot and cold lines, but the voltage in the cold line is inverted (i.e. the polarity is changed) so it is negative when the hot signal is positive. These two signals are often referred to as being 180 degrees out of phase with each other but this is technically incorrect — the signals are not actually out of phase, they are opposite polarities, i.e. one signal is effectively flipped upside down rather than being delayed 180°. This confusion could be due to the fact that in a graphical representation of a sine wave (pictured below) the effect of changing polarity and changing the phase 180° looks the same. When the cable is plugged into an input (on a mixer or other equipment) the hot and cold signals are combined. Normally you would expect these two signals to cancel each other out, but at the input stage the inversion is reversed before being merged together, so they actually combine to form a stronger signal.
Along the length of the cable, noise can be introduced from external sources such as power cables, RF interference, etc. This noise will be identical on both hot and cold lines. This is known as a common mode signal - a signal which appears equally on both conductors of a two wire line. So the hot and cold lines carry two signals: A desirable audio signal which has an opposite voltage on each line, and unwanted noise which is the same on both lines. This is where the trick of balanced audio kicks in. At the input stage when the inverted audio signal is re-inverted to make both desirable audio signals the same, the unwanted noise is inverted. Voila - all the unwanted noise is cancelled out, leaving only the combined original signal.
What is Phantom Power?
Phantom power is a means of distributing a DC current through audio cables to provide power for microphones and other equipment. The supplied voltage is usually between 12 and 48 Volts, with 48V being the most common. Individual microphones draw as much current from this voltage as they need.
A balanced audio signal connected to a 3 pin XLR has the audio signal traveling on the two wires – usually connected to pin 2 (+ve) and pin 3 (-ve). Pin 1 is connected to the shield, which is earthed. The audio signal is an AC (alternating current), whereas phantom power is DC (direct current).
The DC phantom power is transmitted simultaneously on both pin 2 and 3, with the shield (pin 1) being the ground. Since the DC voltage on the ‘hot’ and ‘cold’ pins (2 & 3) is identical, it is seen by equipment as “common mode” noise and rejected, or ignored, by the equipment. If you put a volt meter on pins 1 & 2, or pins 1 & 3, you will see the 48v DC phantom power, but if you meter pins 2 & 3 (the audio carrying wires) you will see no voltage. The DC voltage can be harnessed however, and used to power microphones or other devices. In summary, audio signals transmit as AC current, whereas powered equipment requires DC current to operate. Phantom power is a clever way of using one cable to transmit both currents.
What is UltraScope?
Blackmagic UltraScope provides technically accurate waveform monitoring with a beautifully designed computer interface. Connect Blackmagic Cinema Camera to any compatible computer using Thunderbolt technology to display 6 live scope views on a single monitor. Use UltraScope on set or in any location for Parade, Waveform, Vectorscope and Histogram signal measurement. UltraScope includes picture view, audio level and phase monitoring. It is bundled for free with the camera.
Why does the juicedLink low-noise preamps use Mic Level instead of Line Level outputs?
Robert from juicedLink says:
What cable should I use to get from a H4N to the BMCC?
Discussed here.
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FIRMWARE NOTES:
What firmware release would you currently recommend using for best audio performance?
We'd always recommend using the latest firmware release. The 1.8 firmware release addressed the frequency response issue of previous firmware builds. The 1.9+ firmware releases added audio meters to all of the camera line. The 4.0 release for the Ursa Mini brings with it a whole heap of audio functionality improvements.
Information on the 1.1, 1.2 and 1.2.1 camera firmware release:
- This firmware release has slightly better frequency response when set to Line Level as opposed to Mic Level. In both cases however some lower frequency attenuation occurs. Luckily it seems the filtering is done after the analog-to-digital conversion and can easily be reconstructed without penalty in post production.
- This firmware release contains a DC Offset bug which must be fixed in post production.
- The DC Offset sadly penalises the best possible signal to noise ratio performance.
- The DC Offset varies depending on the levels set in the camera.
- MediaExpress version 3.1.2 incorrectly displays audio levels (about 5dB too high).
- When using Mic Level inputs - the "sweet spot" is between 20-30% gain level in the camera.
- If you're using a Mic-level preamp, such as a juicedLink low-noise pre-amp we'd recommend setting the camera to Mic Level 25%, and then adjust the pre-amp to -12dB.
- If you're using a mixer such as the Sound Devices 302, we'd recommend setting the camera to Mic Level 25%, and then apply -40dB XLR Attenuation using the 302 menu.
- If you're using a mixer such as the Sound Devices 552, we'd recommend setting the camera to Line Level 77%, and then outputting Line Level from the 552.
- The camera automatically switches from Mic Level to Line Level when "hot" signal is received. The camera must be restarted to reset this.
- The camera automatically shuts off the Audio Functionality when a "very hot" signal is received when in Line Level. The camera must be restarted to reset this.
Information on the 1.3, 1.3.1, 1.4, 1.4.1, 1.5 and 1.5.1 camera firmware release:
- This firmware release no longer contains the DC Offset Bug.
- MediaExpress, UltraScope and the camera itself now have uniform meter correlation.
- The camera no longer switches from Mic Level to Line Level when overloaded.
- The camera no longer switches off audio functionality when a Line Level Signal is overloaded.
- This firmware release sadly introduces a frequency response issue, where low frequency sounds are heavily attenuated in both Mic and Line Level (although Mic Level is far worse). Luckily it seems the filtering is done after the analog-to-digital conversion and can easily be reconstructed without penalty in post production.
- When using Mic Level inputs - the "sweet spot" is around 80% gain level in the camera, as digital attenuation occurs in the camera up until the 80% mark.
- When using Line Level inputs - the "sweet spot" seems to be 100% gain level in the camera.
Information on the 1.6.1 camera firmware release:
- This release doesn't seem to offer any audio benefits for BMCC and Pocket Camera users - however, as it offers "General stability improvements", we still recommend upgrading. This firmware release was primarily designed for the BMP4K - in which it address the frequency response issue - however it seems to introduce a storage delay/reverb effect on the headphone output of the BMP4K. We're still unsure whether this is a firmware or hardware glitch.
You can read more about testing out the 1.6.1 release here.
Information on the 1.8 camera firmware release:
- This release fixes the frequency response issue on the BMCC.
Information on the 1.9.3 camera firmware release:
- David Green has done some detailed tests which can be found here.
How do I fix the frequency response issue on a Mic Level input when using the 1.3/1.4/1.5 firmware?
Apply a 500Hz 15dB 24dB/oct and a 250Hz 15dB 24dB/oct Low Shelf to the audio. Please refer to
You can also use this example of an effect you could apply in Adobe Audition.
Thomas Bruegger has also kindly created an audio preset for Premiere.
How do I fix the frequency response issue on a Line Level input when using the 1.3/1.4/1.5 firmware?
Here's an example of an effect in Adobe Audition you can try.
Thomas Bruegger has also kindly created an audio preset for Premiere.
Can I plug a microphone directly into the camera when using the 1.3 firmware?
Yes, you can. You can listen to some examples here. Keep in mind that the camera does NOT supply Phantom Power, and is expecting a BALANCED audio signal.
How does Mic Level compare to Line Level on the 1.3 firmware?
You can listen to some examples here.
How does the frequency response compare between Mic Level & Line Level on the 1.3 firmware?
You can listen to some examples here.
Do all balanced cables and adapters work with the Blackmagic Cinema Camera?
No.
If you can't find the answer below, before you post a question, give the Search function a try, if for no other reason than to refine the scope of your question. Most of the time you'll find your question has already been answered. Reading other responses will also serve as good "research" for your own question.
If you can't find your answer via search, then no problem, post away! But if you're too lazy to search, then don't be surprised if your post doesn't get too many replies!
Finally... PLEASE use your full name when posting. The idea of this rule, which has existed since the creation of these forums, is that users who can be clearly identified will be more respectful than those who remain anonymous.
Happy Shooting!
P.S. There's a great thread here where Johannes Hoffmann chats about affordable and reasonable audio solutions for the BMCC.
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Please be aware that this thread is not associated with or endorsed by Blackmagic Design.
If you notice a mistake or something that's out-dated please let me know.
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GENERAL ADVICE:
READ THE MANUAL:
The manauls for all of Blackmagic's products are actually REALLY detailed, and REALLY easy to read. We highly recommend checking them out as a first point of call.
PHANTOM POWER:
It is standard practice to always plug in your XLR cable before switching phantom power on. Phantom power can also take quite a while to discharge after switching phantom power off on URSA Mini. Please be aware that you should wait a few minutes when switching off phantom power before plugging in any other microphones or XLR audio equipment.
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BLACKMAGIC URSA MINI:
Can I record decent audio on the Blackmagic Ursa Mini?
Yes - you can hear some tests here.
What audio inputs does the Blackmagic Ursa Mini have?
The Ursa Mini has 2 x XLR analog switchable between mic and line levels with Phantom power support.
What audio outputs does the Blackmagic Ursa have?
The Ursa has a 1/4” jack output for headphone monitoring.
There is also embedded stereo audio on the 12G-SDI output. The 12G-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Ursa Mini?
You can monitor levels on the touch screen.
Does the Blackmagic Ursa Mini come with a microphone?
Yes, the Ursa comes with an Integrated Stereo microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Ursa Mini have an Internal Speaker?
Yes, the Ursa Mini has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Ursa?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. When recording to Compressed RAW CinemaDNG, Uncompressed 48kHz 24bit audio is included in a standalone WAV file.
Does the Blackmagic Ursa Mini provide Phantom Power?
Yes, Phantom Power can be activated via the touch screen individually for both XLR inputs.
Does the Blackmagic Ursa Mini support external timecode?
Yes, the camera features a BNC Timecode/Reference Input.
Can I adjust the audio levels on the camera while recording?
Yes - it has physical knobs, but you can also adjust the gain via the touch screen.
How is the quality of the headphone output on the camera?
Much better than previous cameras - it's much less noisy. However, it's also very delayed from the picture, so it's very hard to monitor while you're shooting. It's great for calibration and confidence checking, and also playback.
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BLACKMAGIC URSA:
Can I record decent audio on the Blackmagic Ursa?
Yes - the Ursa records high quality audio.
What audio inputs does the Blackmagic Ursa have?
The Ursa has 2 x XLR analog switchable between mic and line levels with Phantom power support.
What audio outputs does the Blackmagic Ursa have?
The Ursa has a 1/4” jack output for headphone monitoring.
There is also embedded stereo audio on the 12G-SDI output. The 12G-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Ursa?
There is a massive audio meter on the right side of the camera. You can also monitor the audio via the touch screen.
Does the Blackmagic Ursa come with a microphone?
Yes, the Ursa comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Ursa have an Internal Speaker?
Yes, the Ursa has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Ursa?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. When recording to Compressed RAW CinemaDNG, Uncompressed 48kHz 24bit audio is included in a standalone WAV file.
Does the Blackmagic Ursa provide Phantom Power?
Yes, Phantom Power support was enabled in the 1.9.9 firmware release.
Does the Blackmagic Ursa support external timecode?
Yes, the camera features a BNC timecode in and timeout out as well as a Reference Input.
Can I adjust the audio levels on the camera while recording?
Yes.
How is the quality of the headphone output on the camera?
We have not personally tested the Ursa. If you have, let us know!
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BLACKMAGIC STUDIO CAMERA:
Can I record decent audio on the Blackmagic Studio Camera?
We haven't tested the Blackmagic Studio Camera. If you have, let us know!
What audio inputs does the Blackmagic Studio Camera have?
The Studio Camera has 2 x XLR analog switchable between mic and line levels with Phantom power support.
What audio outputs does the Blackmagic Studio Camera have?
The Studio Camera a Aviation headphone (Fixed Wing Plugs) output for talkback and audio monitoring.
There is also embedded stereo audio on the 3G-SDI output. The 3G-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Studio Camera?
We believe there will be on-board audio meters in a future software update.
Does the Blackmagic Studio Camera come with a microphone?
Yes, the Studio Camera comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Studio Camera have an Internal Speaker?
Yes, the Studio Camera has an Integrated mono speaker which can be used for audio playback on the camera.
Does the Blackmagic Studio Camera provide Phantom Power?
Yes. Some users have reported problems with it, however this has been addressed in the 1.8 firmware release.
Can I adjust the audio levels on the camera while recording?
Yes.
Does the Blackmagic Studio Camera have overload protection?
No.
How is the quality of the headphone output on the camera?
We won't know for certain until we get more feedback from users.
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BLACKMAGIC POCKET CINEMA CAMERA:
What audio inputs does the Blackmagic Pocket Cinema Camera have?
The BMPCC has 1 x 3.5mm stereo audio plug. Unlike the BMCC this input is UNBALANCED.
What audio outputs does the Blackmagic Pocket Cinema Camera have?
The BMPCC has a 1 x 3.5mm stereo headphone output for monitoring. There is also embedded audio on the HDMI output, meaning you could monitor the audio using a third-party product.
How do I monitor levels on the Blackmagic Pocket Cinema Camera?
From firmware release version 1.9.3, you now have audio meters on camera. You can also monitor levels via the embedded audio coming off the HDMI port. The HDMI signal contains Stereo 48kHz 24bit audio.
What are some examples of third-party video monitors or viewfinders that allow you to monitor audio from an embedded HDMI signal?
You could try the Cineroid EVF4RVW, TVLogic VFM-056WP, Ikan MD7, Kinotehnik LCDVFe or Alphatron EVF-035W-3G. You can also use SDI only monitors with a HDMI to SDI adapter.
Does the Blackmagic Pocket Cinema Camera come with a microphone?
Yes, the BMPCC comes with an Integrated Stereo microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Pocket Cinema Camera have an Internal Speaker?
Yes, the BMPCC has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Pocket Cinema Camera?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files.
Does the Blackmagic Pocket Cinema Camera provide Plug-in Microphone Power?
Yes, the Blackmagic Pocket Cinema Camera supplies plug-in power of 2.5V on the Microphone Port when Channel 1 and 2 are set to "Mic" in the menu. This has been tested with the Tascam TM-2X by a community member.
What are some examples of a small shotgun microphone that works with the Blackmagic Pocket Cinema Camera?
It's worth having a look at the Q DSLR-Video Microphone Kit (AUD$110). It's battery powered, so it doesn't require additional plug-in or phantom power. The Sony ECM-CG50 (AUD$$220.00) and Sennheiser MKE 400 (AUD$189.00) are two other battery powered options.
Does the Blackmagic Pocket Cinema Camera support external timecode?
The only way to record timecode to the BMPCC is to connect your timecode generator signal to one of the two audio inputs on the camera. You can then use DaVinci Resolve (9.0.3 and above), Avid Media Composer or Adobe Premiere CC to translate the audio timecode data into an additional timecode track, which can be used for syncing purposes. Final Cut Pro users can use 3rd party plugins such as AuxTC reader.
Can I adjust the audio levels on the camera while recording?
Yes, you can - however there will be a noticeable clicking in the recorded audio, and is therefore not recommended.
How is the quality of the headphone output on the camera?
Fairly poor. Our recommendation would be to listen to the audio feed on the HDMI signal.
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BLACKMAGIC PRODUCTION 4K:
Can I record decent audio on the Blackmagic Production Camera 4K
We've been able to get "decent" audio from the BMP4K on the 1.6.1 firmware using an external pre-amp. The frequency response issue doesn't exist on this camera (like it does on the BMCC on firmware previous to 1.8). We recommend using the latest 1.9.9 firmware, which addresses majority of the major audio concerns (including on-camera meters).
An external pre-amp/mixer is a given if you want to get good audio, regardless of what camera you're using. I wouldn't connect a ME66 directly to an Alexa ever if I was being serious with the audio - so you shouldn't expect you can just connect a ME66 directly to a BMC. Having said that - it WORKS - and you could connect a microphone directly to the camera as a guide track.
If you're doing anything that requires CRITICAL audio - then I'd still strongly suggest using an external audio recorder, and just use the BMP4K audio as a guide track and timecode reference. Even then, I'd still recommend a good external pre-amp/mixer.
What audio inputs does the Blackmagic Production Camera 4K have?
The BMP4K has 2 x 1/4” BALANCED jacks for professional analog audio, switchable between mic and line levels.
The BALANCED part is extremely important, because if you use incorrect cabling with the camera, due to the way balanced audio works (see above), the signal might cancel itself out. Balanced audio works on the principle that two identical signals which are opposite polarities (often erroneously called "out of phase") will cancel each other out. The cables used in such systems are designed to carry two versions of the signal and manipulate the polarities of these signals to eliminate noise.
What audio outputs does the Blackmagic Production Camera 4K have?
The BMP4K has a 1 x 3.5mm stereo headphone output for monitoring. There is also embedded audio on the HD-SDI output, meaning you could use a product such as the Blackmagic Audio Monitor to monitor levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Production Camera 4K?
From firmware release 1.9, you can now via audio levels on camera. You can also connect a Thunderbolt computer to the BMP4K, and monitor audio levels using UltraScopes, which is a software package included with the camera. Alternatively, you could also connect a product such as the SmartScope Duo 4K (or 3rd party products) and monitor the audio levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
What are some examples of third-party video monitors or viewfinders that allow you to monitor audio from an embedded SDI signal?
You could try the Cineroid EVF4CSS, TVLogic VFM-056WP, Ikan MD7 or Alphatron EVF-035W-3G. You can also use HDMI only monitors with a SDI to HDMI adapter.
Does the Blackmagic Production Camera 4K come with a microphone?
Yes, the BMP4K comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Production Camera 4K have an Internal Speaker?
Yes, the BMP4K has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Production Camera 4K?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. Eventually when RAW is released in a future firmware update, it will record Uncompressed 48kHz 24bit audio included in a standalone WAV file.
Does the Blackmagic Production Camera 4K provide Phantom Power?
No, it does not.
Does the Blackmagic Production Camera 4K support external timecode?
The only way to record timecode to the BMP4K is to connect your timecode generator signal to one of the two audio inputs on the camera. You can then use DaVinci Resolve (9.0.3 and above), Avid Media Composer or Adobe Premiere CC to translate the audio timecode data into an additional timecode track, which can be used for syncing purposes. Final Cut Pro users can use 3rd party plugins such as AuxTC reader.
Can I adjust the audio levels on the camera while recording?
Yes, you can - however there will be a noticeable clicking in the recorded audio, and is therefore not recommended.
How is the quality of the headphone output on the camera?
Fairly poor. Our recommendation would be to listen to the audio feed on the HD-SDI signal.
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BLACKMAGIC CINEMA CAMERA EF & MFT:
Can I record decent audio on the Blackmagic Cinema Camera EF/MFT?
We've been able to get "usable" audio from the BMCC on both the 1.2.1 and 1.3 firmware using an external pre-amp. Unfortunately though with both firmware releases you need to do some post-processing to make it sound "right". The 1.8 firmware however fixes the DC offset and frequency attenuation issues. We recommend using the latest 1.9.9 firmware, which addresses majority of the major audio concerns (including on-camera meters).
An external pre-amp/mixer is a given if you want to get good audio, regardless of what camera you're using. I wouldn't connect a ME66 directly to an Alexa ever if I was being serious with the audio - so you shouldn't expect you can just connect a ME66 directly to a BMC.
If you're doing anything that requires CRITICAL audio - then I'd still strongly suggest using an external audio recorder, and just use the BMC audio as a guide track and timecode reference. Even then, you still need a good external pre-amp/mixer.
What audio inputs does the Blackmagic Cinema Camera EF/MFT have?
The BMCC has 2 x 1/4” BALANCED jacks for professional analog audio, switchable between mic and line levels.
The BALANCED part is extremely important, because if you use incorrect cabling with the camera, due to the way balanced audio works (see above), the signal might cancel itself out. Balanced audio works on the principle that two identical signals which are opposite polarities (often erroneously called "out of phase") will cancel each other out. The cables used in such systems are designed to carry two versions of the signal and manipulate the polarities of these signals to eliminate noise.
What audio outputs does the Blackmagic Cinema Camera EF/MFT have?
The BMCC has a 1 x 3.5mm stereo headphone output for monitoring. There is also embedded audio on the HD-SDI output, meaning you could use a product such as the Blackmagic Audio Monitor to monitor levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
How do I monitor levels on the Blackmagic Cinema Camera EF/MFT?
From the 1.9.3 firmware release, you can now monitor audio levels on-camera. You can also connect a Thunderbolt computer to the BMCC, and monitor audio levels using UltraScopes, which is a software package included with the camera. Alternatively, you could also connect a product such as the SmartScope Duo 4K (or 3rd party products) and monitor the audio levels coming off the HD-SDI signal. The HD-SDI signal is 48kHz 24bit.
What are some examples of third-party video monitors or viewfinders that allow you to monitor audio from an embedded SDI signal?
You could try the Cineroid EVF4CSS, TVLogic VFM-056WP, Ikan MD7 or Alphatron EVF-035W-3G. You can also use HDMI only monitors with a SDI to HDMI adapter.
Does the Blackmagic Cinema Camera EF/MFT come with a microphone?
Yes, the BMCC comes with an Integrated mono microphone that can be used as a VERY ROUGH guide track. The quality of this microphone is fairly low due to the fact it's internal to the camera.
Does the Blackmagic Cinema Camera EF/MFT have an Internal Speaker?
Yes, the BMCC has an Integrated mono speaker which can be used for audio playback on the camera.
What format is the audio recorded to on the Blackmagic Cinema Camera EF/MFT?
When recording to ProRes or DNxHD, Uncompressed 48kHz 24bit audio is embedded into the ProRes or DNxHD files. When recording to RAW 2.5K CinemaDNG, Uncompressed 48kHz 24bit audio is included in a standalone WAV file.
Does the Blackmagic Cinema Camera EF/MFT provide Phantom Power?
No, it does not.
Does the Blackmagic Cinema Camera EF/MFT support external timecode?
The only way to record timecode to the BMCC is to connect your timecode generator signal to one of the two audio inputs on the camera. You can then use DaVinci Resolve (9.0.3 and above), Avid Media Composer or Adobe Premiere CC to translate the audio timecode data into an additional timecode track, which can be used for syncing purposes. Final Cut Pro users can use 3rd party plugins such as AuxTC reader.
Can I adjust the audio levels on the camera while recording?
Yes, you can - however there will be a noticeable clicking in the recorded audio, and is therefore not recommended.
How is the quality of the headphone output on the camera?
Fairly poor. Our recommendation would be to listen to the audio feed on the HD-SDI signal.
Can I use the MixPre-D with the BMCC?
Yes - refer to this thread.
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GENERAL INFORMATION:
What is a DC offset?
DC offset is an offsetting of a signal from zero. If you look on an audio waveform it would mean that the waveform in default view appears not to be centered on the 0.0 horizontal line. A sound that has DC offset will not be at its loudest possible volume when amplified or normalized. This is because the offset reduces the headroom between the peak level of the audio and the maximum possible level without clipping. This problem can possibly extend to the mix as a whole, since a sound with DC offset and a sound without DC offset will have DC offset when mixed.
What is Line Level?
Line level is the specified strength of an audio signal used to transmit analog sound between audio components such as CD and DVD players, TVs, audio amplifiers, and mixing consoles. As opposed to line level, there are weaker audio signals, such as those from microphones and instrument pickups, and stronger signals, such as those used to drive headphones and loudspeakers. The strength of these various signals depends on the output voltage of the source device, along with its output impedance.
A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. The nominal level and the reference voltage against which it is expressed depend on the line level being used. While the nominal levels themselves vary, only two reference voltages are common: decibel volts (dBV) for consumer applications, and decibels unloaded (dBu) for professional applications.
The most common nominal level for consumer audio equipment is −10 dBV, and the most common nominal level for professional equipment is +4 dBu (by convention, decibel values are written with an explicit sign symbol).
The Blackmagic Cinema Camera's expect professional +4 dBu signals. If you're trying to get a -10 dBV signal into the camera, one easy way would to just leave the camera as Mic Level and use an in-line XLR pad to reduce the signal. Not ideal, as the pre-amp on the BMC is not great, but it would be a cheap and quick fix. Alternatively, you could use a pre-amp on the camera to boost the signal by 11.79dB.
Essentially if you plug a -10dBV output into a +4dBu input the signal is coming in 11.79dB quieter than the gear was designed for... so you need to turn something up. However, in all cases connecting a -10dBv output to the input of +4dBU gear will increase the noise floor.
What does Balanced Audio mean?
Balanced audio is a method of interconnecting audio equipment using balanced lines. This type of connection is very important in sound recording and production because it allows for the use of long cables while reducing susceptibility to external noise.
Balanced audio cables use an extra line, and consist of a hot line (positive), cold line (negative) and earth. The audio signal is transmitted on both the hot and cold lines, but the voltage in the cold line is inverted (i.e. the polarity is changed) so it is negative when the hot signal is positive. These two signals are often referred to as being 180 degrees out of phase with each other but this is technically incorrect — the signals are not actually out of phase, they are opposite polarities, i.e. one signal is effectively flipped upside down rather than being delayed 180°. This confusion could be due to the fact that in a graphical representation of a sine wave (pictured below) the effect of changing polarity and changing the phase 180° looks the same. When the cable is plugged into an input (on a mixer or other equipment) the hot and cold signals are combined. Normally you would expect these two signals to cancel each other out, but at the input stage the inversion is reversed before being merged together, so they actually combine to form a stronger signal.
Along the length of the cable, noise can be introduced from external sources such as power cables, RF interference, etc. This noise will be identical on both hot and cold lines. This is known as a common mode signal - a signal which appears equally on both conductors of a two wire line. So the hot and cold lines carry two signals: A desirable audio signal which has an opposite voltage on each line, and unwanted noise which is the same on both lines. This is where the trick of balanced audio kicks in. At the input stage when the inverted audio signal is re-inverted to make both desirable audio signals the same, the unwanted noise is inverted. Voila - all the unwanted noise is cancelled out, leaving only the combined original signal.
What is Phantom Power?
Phantom power is a means of distributing a DC current through audio cables to provide power for microphones and other equipment. The supplied voltage is usually between 12 and 48 Volts, with 48V being the most common. Individual microphones draw as much current from this voltage as they need.
A balanced audio signal connected to a 3 pin XLR has the audio signal traveling on the two wires – usually connected to pin 2 (+ve) and pin 3 (-ve). Pin 1 is connected to the shield, which is earthed. The audio signal is an AC (alternating current), whereas phantom power is DC (direct current).
The DC phantom power is transmitted simultaneously on both pin 2 and 3, with the shield (pin 1) being the ground. Since the DC voltage on the ‘hot’ and ‘cold’ pins (2 & 3) is identical, it is seen by equipment as “common mode” noise and rejected, or ignored, by the equipment. If you put a volt meter on pins 1 & 2, or pins 1 & 3, you will see the 48v DC phantom power, but if you meter pins 2 & 3 (the audio carrying wires) you will see no voltage. The DC voltage can be harnessed however, and used to power microphones or other devices. In summary, audio signals transmit as AC current, whereas powered equipment requires DC current to operate. Phantom power is a clever way of using one cable to transmit both currents.
What is UltraScope?
Blackmagic UltraScope provides technically accurate waveform monitoring with a beautifully designed computer interface. Connect Blackmagic Cinema Camera to any compatible computer using Thunderbolt technology to display 6 live scope views on a single monitor. Use UltraScope on set or in any location for Parade, Waveform, Vectorscope and Histogram signal measurement. UltraScope includes picture view, audio level and phase monitoring. It is bundled for free with the camera.
Why does the juicedLink low-noise preamps use Mic Level instead of Line Level outputs?
Robert from juicedLink says:
From the principle of the the noise figure of cascaded amplifiers, a properly designed a low noise preamplifier will set the noise figure of the entire system. In this case, from a signal to noise perspective, there's no benefit for going in to a recorder LINE level. The recorder at LINE is just going to engage an input attenuator, and then subsequently go through the same signal chain as the MIC input.
The where there is a benefit for running line level, has nothing to do with signal to noise in the recording device. If there's any electromagnetic interference they can be picked up on a long cable run, it's relative affect will be smaller on a line level signal than a MIC level signal. But, for the purposes of a camera preamplifier like a juicedLink, the exposure that you have to electromagnetic susceptibility is quite small, since your cable run is only about 6 inches.
Regarding the camera results at LINE level, my little videos were more focused on an applications guide for users of a juicedLink, so I didn't really cover that. But if I recall correctly, the LINE sensitivity in 1.2 was off the scale (required 100% gain in the camera for a reference test tone from and ENG mixer like the MixPre). So, the SNR in MIC was actually better than in LINE (from what I tested). The sensitivity of 1.3 in LINE was within range, but I don't recall the cal gain level in the camera.
What cable should I use to get from a H4N to the BMCC?
Discussed here.
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FIRMWARE NOTES:
What firmware release would you currently recommend using for best audio performance?
We'd always recommend using the latest firmware release. The 1.8 firmware release addressed the frequency response issue of previous firmware builds. The 1.9+ firmware releases added audio meters to all of the camera line. The 4.0 release for the Ursa Mini brings with it a whole heap of audio functionality improvements.
Information on the 1.1, 1.2 and 1.2.1 camera firmware release:
- This firmware release has slightly better frequency response when set to Line Level as opposed to Mic Level. In both cases however some lower frequency attenuation occurs. Luckily it seems the filtering is done after the analog-to-digital conversion and can easily be reconstructed without penalty in post production.
- This firmware release contains a DC Offset bug which must be fixed in post production.
- The DC Offset sadly penalises the best possible signal to noise ratio performance.
- The DC Offset varies depending on the levels set in the camera.
- MediaExpress version 3.1.2 incorrectly displays audio levels (about 5dB too high).
- When using Mic Level inputs - the "sweet spot" is between 20-30% gain level in the camera.
- If you're using a Mic-level preamp, such as a juicedLink low-noise pre-amp we'd recommend setting the camera to Mic Level 25%, and then adjust the pre-amp to -12dB.
- If you're using a mixer such as the Sound Devices 302, we'd recommend setting the camera to Mic Level 25%, and then apply -40dB XLR Attenuation using the 302 menu.
- If you're using a mixer such as the Sound Devices 552, we'd recommend setting the camera to Line Level 77%, and then outputting Line Level from the 552.
- The camera automatically switches from Mic Level to Line Level when "hot" signal is received. The camera must be restarted to reset this.
- The camera automatically shuts off the Audio Functionality when a "very hot" signal is received when in Line Level. The camera must be restarted to reset this.
Information on the 1.3, 1.3.1, 1.4, 1.4.1, 1.5 and 1.5.1 camera firmware release:
- This firmware release no longer contains the DC Offset Bug.
- MediaExpress, UltraScope and the camera itself now have uniform meter correlation.
- The camera no longer switches from Mic Level to Line Level when overloaded.
- The camera no longer switches off audio functionality when a Line Level Signal is overloaded.
- This firmware release sadly introduces a frequency response issue, where low frequency sounds are heavily attenuated in both Mic and Line Level (although Mic Level is far worse). Luckily it seems the filtering is done after the analog-to-digital conversion and can easily be reconstructed without penalty in post production.
- When using Mic Level inputs - the "sweet spot" is around 80% gain level in the camera, as digital attenuation occurs in the camera up until the 80% mark.
- When using Line Level inputs - the "sweet spot" seems to be 100% gain level in the camera.
Information on the 1.6.1 camera firmware release:
- This release doesn't seem to offer any audio benefits for BMCC and Pocket Camera users - however, as it offers "General stability improvements", we still recommend upgrading. This firmware release was primarily designed for the BMP4K - in which it address the frequency response issue - however it seems to introduce a storage delay/reverb effect on the headphone output of the BMP4K. We're still unsure whether this is a firmware or hardware glitch.
You can read more about testing out the 1.6.1 release here.
Information on the 1.8 camera firmware release:
- This release fixes the frequency response issue on the BMCC.
Information on the 1.9.3 camera firmware release:
- David Green has done some detailed tests which can be found here.
How do I fix the frequency response issue on a Mic Level input when using the 1.3/1.4/1.5 firmware?
Apply a 500Hz 15dB 24dB/oct and a 250Hz 15dB 24dB/oct Low Shelf to the audio. Please refer to
for further information.
You can also use this example of an effect you could apply in Adobe Audition.
Thomas Bruegger has also kindly created an audio preset for Premiere.
How do I fix the frequency response issue on a Line Level input when using the 1.3/1.4/1.5 firmware?
Here's an example of an effect in Adobe Audition you can try.
Thomas Bruegger has also kindly created an audio preset for Premiere.
Can I plug a microphone directly into the camera when using the 1.3 firmware?
Yes, you can. You can listen to some examples here. Keep in mind that the camera does NOT supply Phantom Power, and is expecting a BALANCED audio signal.
How does Mic Level compare to Line Level on the 1.3 firmware?
You can listen to some examples here.
How does the frequency response compare between Mic Level & Line Level on the 1.3 firmware?
You can listen to some examples here.
Do all balanced cables and adapters work with the Blackmagic Cinema Camera?
No.