Audio-dg (AGD) DAC + SBT + EDO

[The Fez]

Hi Guys -- Had a SBT for years now. Really nice product. Just wondering
if anyone else has a Audio-gd DAC connected via USB. I have the EDO
installed, but the SBT doesn't recognise the DAC without a USB hub? I
was of the impression the AGD DAC'S can connect direct to the Touch. I'm
using the USB cable as supplied by AGD that came with the DAC..

Thanks for any thoughts...


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[JohnSwenson]

Post by The Fez
Hi Guys -- Had a SBT for years now. Really nice product. Just wondering
if anyone else has a Audio-gd DAC connected via USB. I have the EDO
installed, but the SBT doesn't recognise the DAC without a USB hub? I
was of the impression the AGD DAC'S can connect direct to the Touch. I'm
using the USB cable as supplied by AGD that came with the DAC..
Thanks for any thoughts...

There could be two issues, the USB power management in the Touch
strictly enforces the USB power management protocols, max current of
500mA and device has to run under 100mA until it requests higher
current. If a device doesn't meet this it won't work.

The other is a restriction in the USB hardware that prevents it from
properly working with a UAC1 asynchronous DAC. (UAC1 DACs only go up to
96KHz sample rate) Strangely enough the high speed mode of UAC2 works
fine. (UAC2 goes up to at least 192)

Using a hub with a UAC1 USB interface gets around the hardware
linitation of the Touch. In addition if the DAC pulls too much current a
powered hub can fix the situation.

John S.


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