2 seperate amps for sure..... that way you arent restriced to the same frequency... i would go with a 2-channel amp (that has around 300 rms) then i would go with a mono block or a 2-channel amp that pushes at least 1200 watts (600 per channel if its...
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...