Got my D1 on Tuesday of this past week...and got my RMA # this morning.   First impressions...aside from its good looks - sounded no better out of the box than my Fiio D3 via toslink. I ran redbook and 24/96 flac tracks for comparison and could not isolate any real differences in sound...

Quote: Not sure if this applies to your device, but according to the FAQ on the Audioengine website:   Can I connect the D1 DAC to a USB hub? Although D1 may work just fine when connected to most USB hubs, this is not recommended as the data rate may not be fast enough for...

Just ordered a D1 from Crutchfield. Look around, there is currently a $20 off $100+ purchase coupon floating around the net - YMMV. Got mine for $149 and free ship.   As an experiment, I'm looking to run this via optical out of a Netgear NeoTV 550 media player which supports FLAC/WAVE...