Luis, I'm sure that your comments are well-intentioned, but those factors that you describe simply don't exist. Competently designed amps operated within their power limits are transparent. There would have to be major measurable differences in frequency response or distortion for such audible differences to exist. Such measurable differences don't exist and any audible differences claimed disappear when the listener is forced to trust only his ears in a blind listening test.

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Enjoy the music, not the equipment.