#6560, "RE: Recommend what size amp....." In response to Reply # 0
Size of the amplifier shouldn't matter too much. The Pioneer subs have a fairly high sensitivity rating, which means they will play more sound with a small amount of power, as compared to other subs.
With that in mind, you do not need to get a huge amplifier. If you do get a larger amplifier, remember to set the gain fairly low, as you don't want to blow the subs!