good or anus? any upgrade from the old xt-4000D?
http://cgi.ebay.com/XT-4000DEv2-RE-AUDIO-4000W-MONO-BLOCK-CAR-SUB-AMPLIFIER_W0QQitemZ360160573974QQcmdZViewItemQQptZCar_Amplifiers?hash=item53db3e3a16&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1234%7C240%3A1318%7C301%3A1%7C293%3A2%7C294%3A50
http://cgi.ebay.com/XT-4000DEv2-RE-AUDIO-4000W-MONO-BLOCK-CAR-SUB-AMPLIFIER_W0QQitemZ360160573974QQcmdZViewItemQQptZCar_Amplifiers?hash=item53db3e3a16&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1234%7C240%3A1318%7C301%3A1%7C293%3A2%7C294%3A50