
Mattias Murhagen wrote:Dmitry Shijan wrote:I can hear distortion with large headphones if i increase headphones volume to 56 and higher.
I can hear distortion with small plugs headphones if i increase headphones volume to 36 and higher.
The file peaks at 0dBFS True Peak, has an average of -10LKFS and consists mainly of a very low note. That's really a recipe for distortion on many playback systems - unless you turn things down. I would look into the actual schematic of this device to see how the signal flows to make sure you're not missing something.
I don't have this device nor your headphones but judging from what I can see and read here I think your expectations might be off or your testing method.
1. The actual headphones volume is very low when this parasitic noise appears.
2. If i use old MixPre as external headphones preamp and connect it to MixPre-3II line-out i can boost headphones volume really loud without any parasitic noise.
3. If i use old MixPre as external headphones preamp i can hear distortion noise only when headphones volume is boosted VERY high and orange clipping indicator shows headphones clipping.
4. My firewire sound card Echo Audiofire4 with internal headphones peramp produce clean sound without any parasitic noise layers.
5. Maybe it is due analog vs digital headphones amplification?
6. Maybe this is just how ugly digital headphones amplification works in MixPre3II?
7. Maybe it is some internal routing bug that needs to be fixed?
8. Maybe it is defected batch of all early MixPre3IIs? I don't know...
Hope SD tech support answer these questions when they back from holidays.
All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/