Hello,I am completly new to setting up my own system and could use a little bit of help. I currently have a set of Alpine E type 10 inch subwoofers and I am a little unsure of what am to use with them. I have a polk audio pa880 and a pa660 which amp would be better to use for them? The pa880 is a mono amp that can hold two speaker at 4 ohms each. Would this make it a 2 ohm load or two 4 ohm loads? Each sub has an rms of 250 allowing me up to 750 watts am I right about this?