On Wed, 2019-08-21 at 09:55 -0400, Max Kelley wrote:
> We use a Focusrite Scarlett 18i20, it works great! Can support 4
> stereo balanced playout channels... Or is it five? Regardless, we're
> using four. The other nice thing is that it's completely compatible
> with the USB sound protocol or whatever for all of its controls, so
> they're all accessible in alsamixer or what have you.
Curious: how much headroom do you get with those? This has been the big
downside of most USB audio devices I've tested, including those with
balanced I/O: they max out at around 0 dBm. This is largely due to the
limitations of the USB power connection (+5 vdc @ 100 mA max), whereas
a true 'pro' balanced output requires a bipolar +/-15 vdc power supply
to achieve the accustomed headroom of around +20 dBm.
Cheers!
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