Even more puzzling. If the problem is decoding the DD or DTS from the Blu-rays in the 5007, set the PS3 to decode them and output PCM rather than the original bitstream(the listening mode would then be multi-channel in, rather than DD or DTS). You said above that it was "worse" on bitstream from the PS3, but is it any problem at all with PCM output?

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Enjoy the music, not the equipment.