You could get away with a 4-channel and put the tower speakers on 2 channels and the sub on the other 2 channels bridged. I prefer to put everything on separate amps so I would use a 2 channel amp for the tower speakers and either a mono amp or another 2 channel (bridged) amp for the sub. Just make sure that you get an amp/amps that have RMS wattage matched to the speakers. Also, make sure that you have the correct ohm loads for the amp and speakers.
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