Bobby, those who say that about separate amplifiers are ignoring the facts. If the amplifier in a receiver can drive the speakers with flat frequency response and inaudibly low noise and distortion, as is the case in the vast majority of setups, that's all that can possibly be accomplished. If a separate amplifier would happen to have slightly better measurable numbers, that would be meaningless in actual listening if the amplifier in the receiver is already supplying transparent amplification.

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Enjoy the music, not the equipment.