AF, what you're considering is unnecessary. Your 3805 is very powerful and your use of the sub already has taken a significant load off the 3805's amps(incidentally, as was said, the soundstage isn't affected by any competently designed amp). It's highly likely that you're using only a small part of the capability of your 3805 now and there's no good reason to consider a duplicate amp which isn't significantly better. Don't waste your money.

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Enjoy the music, not the equipment.