hey guys...
i need to cap the bass off the 6X9 on the back shelf...
what size capacitor should i be using....???
help

What frequency do you want it cut off at?

I've posted your question here:

http://www.caraudioaustralia.com/ubbcgi/ultimatebb.cgi?ubb=get_topic&f=7&t=003268#000002

You'll need to sign up to post on that forum, but trust me..it's WELL worth it. 1000's of car audio freaks who KNOW their stuff!

I'll get you an answer asap after you tell me what frequency you want it cut off at.

What do people with a 12" Sealed JBL sub cap it at???..
They are the standard 6x9 in a TJ Advance...
I'm a beginner, so i don't exactly know what frequency is what..
Thanks for your help so far

Good question. lol ;)

If you log onto CAA, you can ask that question on the thread I made.

If it helps, I have my rear 6x9's (and front splits) cutting off anything below 80Hz, and my subs handling frequencies upto 100Hz. That combo gives mine the best overall result.

If you want to build your own simple high or low pass filters, this will help:

http://www.loudspeakers101.com/CrosFrm3.htm