4 channel amps are fine to use. Think of it as 2 two channel amps. One thing however that I would advise is that you get a 4-channel that can be bridged. Right now I have a 4 channel amp with 2 channels bridged together powering my JL sub, and the other two channels powering my rear speakers. I have a good headunit that is powering the speakers in the front of the car. Let me know if you need to know anything else about this!!
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