I have this installed pushing two 8 NVX VCW84v3 wired up to a 4ohm impedance so Im pushing these subs below the 650watt RMS rating for sq purposes and at 4ohm for powerefficiency (stock alternator) and control (ported box) and this plays so so so clean, I was originally going to go with Skar amp but went with this for the better S/N. and have no regrets whatsoever. These x series amps if you compare have very high ratings and scale well from 4ohm to 1 ohm. something I would have had to go much higher on price to reach. And gives me the option to buy two more subs and put them in a sealed box @ 2ohms in the future.