I have monitored it both through headphones and through the speaker. Yes, sound out of headphones, not taking the natural built-in mic’s noise into account, is all fine and much much louder. I think I’ve tried all the obvious combinations of sound setup at this point. I even used the color bars sound signal as a reference and it sounds normal through the speaker if I don’t push the speaker’s loudness over 50%. If I do, it starts making noises again. But the color bars reference tone must be what, 440Hz at 0dB? If so, the speaker can reproduce low frequencies around 0dB alright. Then, my assumption is, it’s the high frequencies that it handles totally wrong. I’ve just got an idea. My brother has a sound tone generator. I’m willing to go extra mile and get to the bottom of things before I start tearing this mf down

I’ll put the speaker to test and, if anyone else is interested, will post the results. I need to think about the methodology first. I guess the good start is to reset the camera to its defaults and run the generator through the frequencies. I don’t want to mess with xlr inputs etc. I want to feed the tone into some reasonably good speakers, probably from my hi-fi sound system and then put the camera within, say, one meter of the sound source. I don’t have any professional sound level meter, though, and am not sure how precise this test can be. I think, I can check the frequencies with oscillograph but what about loudness? Well, I guess I as well can leave it to the Ursa Mini LCD’s audio meters.