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That is true. The problem is that raising the input beyond 4 volt severely distorts. This should not happen. As it is, you can't use the last 7 dB or so of the system dynamic range.
I ran my dashboard measurement and all was well. Then I noticed as I was documenting the output in photoshop that it was showing garbage data being captured. It was a sequence of sqarewaves at 750 Hz.
Besides the software issue, we have the self-oscillation or whatever it was that caused the unit to spin its wheels capturing garbage. Imagine monitoring that and having it go to your speaker at high volume. Not good. Not good at all.
Sounds more like an actual hardware problem to me, and semiconductor rather than electrolytic. I would take a closer look at the controller's digital power supply. If voltages all check out, then things don't look good.
Thanks amirm, would you have the frequency response of the microphone inputs for the max sampling frequency (192 kHz) please as you did for Scarlett 2i2 here?
I'd like to know whether I could plug an ultrasound mic to it. In the manual, it is only said "+0 -0.1 dB, 20 Hz/20 kHz". This is also what they say for the Scarlett 2i2 ("20-20kHz ± 0.15dB") however, the latter has a pretty good frequency response in high frequencies when sampled at 192 kHz according to your other review , so I'm hoping this would be the same for the 18i8.