Hey guys, i just bought 2 MTX MZS1204's, single voice coil at 4 ohms, 300 Watts rms each. I read that the correct amp for these subs with be the MTX Mono amp MXA6001? Which is 300 watts at 4 ohms and 600 watts at 2 ohms. I was wondering if someone could explain the difference between 2 and 4 ohms, and if it would be ok to run those 2 subs in series for the 600 watts at 2 ohms. would i be getting the real 600 watts? thanks