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I need help deciding between getting 3 Halo A21 two channel amps for my theater system or saving space and getting 1 Halo A51 five channel amp. I have one A21 already and can get 2 more used ones for about 2,800 or I can get a new A51 for about the same money and turn around and sell my current A21 for a net out lay of about 1400. Any opinions out there?