I bought a used jl audio 500/ 1 without the manual, how do I wire 1 sub up to this? Do the tweeters hook in to this amp, also and where? Simple for a simple mind. Thanks

+ speaker lead to + terminal and - speaaker wire to - terminal. They have 2 sets of leads for ease of using 2 subs, but both neg and pos leads are simply hooked together inside the amp. It's just a convience thing.

The 500/1 is a mono amp for subs. Your tweeters will go to your full range amp.

Download the manual here.
http://mobile.jlaudio.com/products_amps.php?amp_id=252

if your tying to hook tweeters to this amp you bought the wrong amp???????

with that amp..I hope you have some good subs, cuz its gonna hit!