I use the generic hub, it's in the pic I posted. In fact, I have tried two generic USB 2.0 4-port non-powered hubs, and they both worked. I chose the one in the pic because of smaller enclosure that is easy to open and close, and I will do some resoldering to get rid of as many connectors as possible. As for other dacs, it's a hit and miss, but remember that the important thing is not how much current the device really draws, but how much current it claims from the host. True, and it alsp depends on the cellular network strength. If the network coverage is great, the phone does less seeking. The weaker the coverage, the more hunting and the more noise.