Hi, sorry for this question as I am not a specialist in this area but is it possible to add 1000W -2000W ROCKFORD FOSGATE subwoofer sub to current set (I have original ROCKFORD FOSGATE 6CD changer with sub) , basically to make more punch in same time I don't want to change existing set, just to add more power to it. Should I change amplifier? I found one on ebay, can I add this one to existing set? http://cgi.ebay.com/two-alpine-type-r-1 ... otohosting