I just saw on here where you were talking about the jb2000. I've ended up with one on trade and really don't need it or don't know much about them at all. I just know my buddy checked it out and said far as he could tell the capacitors need replacing and a good cleaning was asking 300.00 for it as isYeah...a single new 3-500z goes for about $170...you could prolly turn around and sell that amp for $500....working JB 2000 are kinda rare......one in mint condition will fetch its original price of $850.