AMD, an amp or receiver doesn't care whether the information it's been given is music, speech, explosions, or whatever; if it amplifies one accurately, it'll do the same for the others.

I began to wonder if your receiver had developed a defect, but then I read your other thread. If the sound on movies is in fact "very good", that indicates that the DVD player, receiver and speakers aren't the problem. If the music isn't good, then that's because the music coming into the receiver isn't good.

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Enjoy the music, not the equipment.