im going to buy one of those subs off of ebay for a 10" rockford fosgate 600-1200 wat sub. Question is, is that a good sub and is my mono 700 watt jl amp good enough?

 

What subwoofer?

What amplifier?

I'd need more details so I could comment on this for you.

 

never mind im not buying that sub anyway. when i went to the store the t1 600-1200 watt punch rockford fosgate sub the new guy told me 180 brand new. Its like a 350-450 dollar sub. So i ran home to get cash, by the time i get back to the store the boss is there and he said 315 is the cheapest he'll go. Sux for me!

 

Get an IDMAX 10" for that price ... it will stomp anything Rockford can make.

 

Rockford subs suck.

my opinion
unless of course you hit the power series which are out the *** expensive.