Weak Sub Output

My friend has a 12" audiobhan and a boss amp hooked up to his factory system. he's got a ford taurus and its impossible to add an aftermarket HU without building a new dash, but we hooked his sub and amp all up and the sub hits but not very hard at all. its a noticible difference from without it but its not exactly pounding.

So we took the signal cables and hooked them up to the subwoofer ouptputs on my head unit and the thing hits really hard. and it sounds great. so we're guessing that the problem in his car is weak output from the factory amp (he's got a JBL premium system).

If this assumption is correct, would something like this fix the problem?
Audiobahn AEQ-6Q

or, more inexpensively, because he's already overbudget and doesnt need an entire equalizer
PAC Turbo-1

any help or clarification would be great

[mike2002]

i know they do make dash kits for those ugly oval dashes, they cost more than a regular kit though....just a FYI

does the amp have a switch for low voltage inputs? alot do

yeah they only make a kit for the manual climate controls, he has digital. cant be replaced. and hes on low voltage, with the gains all the way up

I remember that damn football looking thing!!!

[mike2002]

i like the audio bahn unit because it has sub level control....

but it looks like you need to mount it somewhere, is it possible to mount it anywhere somewhat decently? id get one like that, there are TONS of eq's/preamps on ebay for like $40, some used

we were just at car tunes, they said that this is exactly right. i'll probably go with a cheaper one, 30 or 40 bones. i dont need anything great, just good.