On Wed, 23 Sep 2015, Al Peterson wrote:
Do we know if those output lines are *true* balanced/differential, and
not just that resistor trick (Impedance balanced send,
http://www.soundonsound.com/sos/oct13/articles/qanda-1013-4.htm)?
I did not test for that, alas.
I'd believe that USB power may not be enough to deliver a nice stout +4,
so while ten dB down on a balanced output doesn't smell right, it makes
some sense.
USB power is single-ended +5v. An opamp-based circuit capable of
rail-to-rail operation should clip at about +7 dBu.
Has anyone had success with Henry Engineering's "USB Matchbox II"? At $550
MSRP it's a bit steep, but Hank's been getting it right for decades now.
That unit too is USB-powered, so it should have the same issue.
Rob
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