I've run 2 Kenwood 12" 400wrms on a 9105d @ 2ohm. That's 900 watts total in a sealed box in the trunk of an '07 Impala. Sound was beautiful once I replaced all the factory with Kenwood 6.5 components and tweeters in front and 5 way 6x9's in the back. As good as the subs sound, its not enough...