I recently upgraded to a 200wpc x5 power amp. now my sub cant keep up when playing music at concert levels. does good at HT levels. I have a denon 3808ci receiver and infinity Kappa 8.1 mains kappa 7.1 rear I using a Veoldyne HGS-15x the amp is 1250-RMS 3000 peak watts my qustion is should I replace this sub with something eles or just add another sub Thanks Tim