What sort of listening level do you typically play your movies at. I consider normal listening to be around 50db and I watch my movies around 75db to 80db. At levels I watch regular TV at I doubt you would notice a difference, but watching a bluray with lossless audio I would think there would be a noticeable difference given the reliance on the center channel of most current movies. Are you feeding the receiver bitstream or lpcm.
Can't remember DB level but blu Rays on Denon amp at volume usually set at -15
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I believe lpcm ( lossless)