I have 2 12.1 Infinity Perfect subs, single voice coil, they are rated 350w rms each with 1400 watts peak. The impedance is 4 ohms. My question is how much rms wattage should I be looking for to power both of them. 350 or somewhere in the 700 rms area? Also if someone could answer how amps have different ratings, such as 500w @ 4ohms or 750w @ 2 ohms. How do they get from 4 ohms to 2 ohms on a mono amp. Thanks in advance.

500 to 700 watts RMS at a 2 ohm load would be a good match and affordable. You can always use an amp with more power and just turn the gains down but this will cost you more money.

Look for a mono amp that is 2 ohm stable or a stereo amp that is 2 ohm stable bridged.

In general a sealed box will need more power to sound as loud as a ported box.....this may be something to consider when choosing an amp.

Hey loudti, here is what I had in mind. Rockford Fosgate T10001BD. It cranks out 750w@2 ohms or 1000w @ 1 ohms. It is 1 ohm stable. Is that a good choice. Thanks for the advice

It would be a great choice.....very efficient!