Is this a decent sub? it looks alot like a maw 15. http://cgi.ebay.com/MMATS-PRO-AUDIO-15-3-0-SUBWOOFER-USED-1000-WATTS-BEST_W0QQitemZ290274660486QQcmdZViewItemQQptZCar_Subwoofers_Enclosures?hash=item290274660486&_trksid=p3286.c0.m14&_trkparms=72%3A1234%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318