The amp you need really depends on what you want to do with you system. If you know your not going to expand your system or add any more speakers or subs then you can go with a mono amp. However, I like to go with multi-channel amps. This gives me mo...
2-channel amps are designed for two speakers and 4-channel amps for 4 speakers. You can usually bridge a 2-channel to one and a 4-channel to two channels. This will half the impedance of whatever the speakers are.
amps are described by their number of "channels"...if you have a "two channel" amp, you can run one set (two) of speakers. If you want to run 4 speakers, you need a four channel amp or two two channel amps, then an additional one channel amp for your...