Maj, there's no apparent reason why any of that would be needed. The Crown amplifiers all spec at about 800 watts max into 4 ohms. That's all very well, but it's highly unlikely that you'll actually use more power at even brief peaks than your 3808 can supply. There's no good reason to expect better sound quality. Unused amplifier headroom is simply that: unused.

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Enjoy the music, not the equipment.