I agree with Big A on this. 5 channel amps are extreamly flixible in usage. They typically have oversized power supplies so any channels left unused will be rerouted to the other channels.
I would recommend the Alpine PDX-5 class D amp over the infinity. Its much smaller and will run cooler than the infinity amps. A friend of mine had one of thier amps and it huge but I wasnt ompressed at all with its output. I was really soft on the bass dynamics. Poor damping factor for such a large amp.
If you dont mind spending some extra cash I highly recommend the JL HD 5/900 amp. I have one running in 3 channel mode driving 200 X 2 and 500 X 1 and it is an extreamly controlled amplifier. It has tons of dynamic headroom which in my opinion warrants its high price. This is one of the best amps out there.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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