Shivas

I stand by my original opinion here. I doubt making a small jump in amplifier power, even 200w, will do much of anything for him. The max SPL between a 600w and 800w amplifier is barely audible. Probably ~2 db-ish. A new amplifier should be low on your priority list. New Project: 2003 Pathfinder

so then here... another possibility... What 2 subs could i buy to go along with my usb600d amp... after you mention those, we will talk about the proper box for them... if i dont buy an amp... i will have 500 for 2 subs and a box... =D

and is there any custom box building places online that you can order a special box from? ... or is there a pre-made box that would work for the subs, that sumone, will recommend?

well, sh*t... who do i listen to? ... a lot are saying the amp is good... and you, are saying opposite... ... ...

I'm using the same amp, I told you that.  Do the math, though.  If the amp will pass no more than 20 amperes, and the car voltage is 14.4 at it's best, and the amp has a 90% efficiency............then 20 X 14.4 X 90% = 260 watts maximum.  I like the amp and think it's good value, but math doesn't lie.

hmm.. That must have been in another thread. Listen to Stevdart. I have no experience with the amp and was simply speaking generically regarding power. Looks like it is time for a new amp. Sorry for the confusion, I wasn't aware that the USAc amp was that overrated. (sorry!) That said, what I did say regarding the box construction still stands. It is at least as important as the amplifier selection, imo. New Project: 2003 Pathfinder

so sh*t... how am i going to buy 2 subs, an amp, and a custom box? ... with 500 bucks...

Build your own box. Buy that JBL, looks like a good amp. Those Shivas are a good price. Should be around $500 for the whole thing. New Project: 2003 Pathfinder

how big should the shiva box be? ... like dimension wise... not liters and cubic feet... like what would the length... hight... and depth be?