I don't understand the limitation Mark is talking about - or that he got from Outlaw advisers. I have Windows 7 desktop and Outlaw 2150 hooked up via USB. It has no trouble playing the highest res. files from HD tracks.
Is the presumed problem that the 2150 won't process a high res USB signal at all, or it won't process it to the level that the resolution of the file is capable of?
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Outlaw RR2150, Definitive BP8040 speakers (2), Behringer 9 band graphic equalizer. Music sources: CDs, ripped CDs, MP3, some FLAC via desktop computer; tablets via Bluetooth receiver on Outlaw amp.