I bought a 5U last week and generally like the PQ and overall build quality. The unit makes a pulsing, low-level whining noise during playback. After turning the power off AUTO flashes for about 5 minutes, accompanied by another, quieter noise. The noises wouldnt really bother me with the stereo speakers on, but are definitely noticeable when just listening to TV speakers. Can other 5U users comment on their units and is this something that will get worse with time? I could probably send it back, but im sure that would be a major hassle.