ive been doing some online browsing for subs and it seems that a lot of people have posted bad remarks on a lot of jbl subs. some of these problems consist on them not working after a little over a year and problems concering their amp? does anybody out there know of such problems because i am very interested on getting the pb12 as ive heard its a really good sub but after a year its not. also, are ther any subs you recommend under $500 that will give me good tight bass and what other subs should i check out? any help is appreciated, thanks p.s. do you know of any sites with the best bargains?