I'm currently running one cvr124 off a sony xm-1s amp. For Christmas I was gonna get a Kicker ZX400.1 amp to replace the sony xm 1-s. If I feel like it, In January or Febuary I might get another one to make it a pair. If I did so could I run another Kicker ZX400.1 to it and have a total of three amps in my car, my 4 channel speaker amp and the two 11ZX400.1's. Or would I need to get 1 1000 watt amp and run the subs off that. Also how much of a difference in sound would there be if I were to get a ported box for the both of em, to replace the one sealed I already have? I don't like sloppy bass but I listen to mostly dubstep, house, Drum and bass, electronica, and Nu disco so I need a lot of it! I appreciate all the help!