I’m attempting to use a Sparky with Dietpi to feed multiple USB DACs. The one DAC I have that is not USB powered (It has its own power supply) works fine on the USB 3.0 and USB 2.0 ports. However, my USB powered DACs (e.g., Dragonfly Black) only work on the USB 3.0 port.
When connected to the USB 2.0 ports, the Dragonfly DACs show up both in Roon and in ALSA mixer, but no sound comes out. Roon shows a lossless RAAT signal path, and the green LED on the Dragonfly even comes on, indicating that it is playing at 44.1. I’ve tried switching the audio settings in Dietpi from “usb dac” to “usb 1.1 dac” but that didn’t resolve the problem.