So My battery is dying so I got a cap and now I'm sorry but my sub still dont sound like they should. I have a dual amp set up with my vented box, all legit and now it seems like they arnt getting enough power i have 2 12in mtx terminators 4ohm running on two dual-brand 400 watt amps with bridged one sub on each rms 175 on each amp and 400 peak. The subs limitations are 200 rms and 400 peak... so i dont see the problem they are all capped on a 500k micro farrad cap that is rated for them. Can anyone help me? Everyone i know has the exact same set up in almost identical cars and theres sounds so much better with deeper bass. I wired them right and the amps both at frequencies that sounded the bassiest with bass bost on and gain all the way up like wtf is up?