Hi,
Was curious to what this $500 device was, just a quick correction, it
turns out it has its own built in power supply (115/230V 50 - 60Hz, 2W)
and cable that comes out of it.
Info gleaned from here but still $500 seems expensive for what it is:
http://www.bhphotovideo.com/c/product/628007-REG/Henry_Engineering_USB_MATCHBOX_II_USB_Matchbox_II.html
Wayne Merricks
The Voice Asia
On 23/09/15 15:17, Rob Landry wrote:
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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