Ray, whatever you read that said that, forget it. There's no way that an amp can affect the soundstage during the amplification process. Special sound processing modes, of course, can sometimes do that. There can be be pride of ownership in having expensive separates and they may have a longer service life, but there won't be any sound benefit except in the unlikely event that a receiver as powerful as your 3803 isn't powerful enough. No, you're not missing anything.

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Enjoy the music, not the equipment.