The subwoofer is 500w RMS and 1000w peak, it has a 2.5" voice coil and is dual 2ohm. it was a amazon subwoofer that is now out of stock. i have a 2.1 Cu Ft box ported and tuned to 42hz. i have a alpine mrv-m500. if i do keep this subwoofer or do the box with 6 8" subs in it i will use this amp. but if i buy the skar audio 15s i will get a better amplifier.