Are Hifonics amps any good? I plan on buying a Hifonics amp to power my two alpine 15" type R's. The amp is 1500 watts RMS @1ohm. The subs are 750 watts RMS a piece. So that matches up good. what exactly does the 1 0hm mean? The subs are 4 ohm dual voice-coil. So tell me your advice.