The sub i am using is one of Pioneers very old models, the TS-W302C, which has great SQ. The box the sub fires into is 1.5^ft sealed and filled with wadding which in my opinion tightens up the bass and takes away the boominess. There are also two bracing blocks inside the box, one on either side of the sub. The sub is being powered by the Pro-Plus Nemesis @ 4ohms. The other amp was running front Kenwood components.