The Fez wrote: > 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. ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=99599 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
