Right now I have an Acurus 100x3 running my three front klipsch's and they sound awesome. I don't quite see how one could say a receiver is more dynamic than another if they are playing the same frequencies. Maybe have different colored sounds and methods of calibration, but not more dynamic. This is of course if were talking about two equivalent models from two companies. When I paired my Klipsch's with my pioneer, the sound was bright and very accurate. The minute I got an amp the brightness went away and the soundstage widened significantly. Huge difference. My biggest concern now is a slight hum coming through my speakers but it is most likely a power problem coming from the receiver so I ordered a Power Conditioner. With most movies, most people are not going to notice a difference between amped and non-amped, because movies generally don't require much power from the receiver. It's music that you will notice a huge difference with.
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