Normally amp for sub will have a bass boost at a fixed frequency. For example 18 db at 45hz. What happen if add a Eq that allow me to add more DB at a different HZ. Like the one from kenwood model KEC-202. The reason i aksked is because my current Set which consist of A sealed 15 JLW6 and Rockford fosgate 250, can hit loud but not tight and hard enough for my taste. I would like something that hit like is on a hatchback. I thought about taking the rear speaker so the bass can come through the holes. Any one with any experience with no rear speakes on the rear deck?
Also, my current high consist of a pair of rainbow profi vanodine (sp?). It sounds clear but lack of details. I was hoping that the EQ can help me on this. What do u guys think?

 

which car bro? if its a TL, takin' out the stock sub makes a noticeable improvement! I reccomend it

 

Bass boost is a tricky thing.

Each 3dB + requires 2x the power from the amp AT THAT FREQUENCY. At some point your amp will run out of power and start clipping, which means instead of playing gently-changing bass notes it will be playing DC battery-type voltage during bass peaks.

Ever take a 9V battery across a door speaker? It thrusts outward and stays there until you take the battery away. That's not music, that's wind. In some enclosures, that can cause the speaker to overtravel and blow through mechanical damage.

Regardless of which school of why-speakers-blow-up you subscribe to, you shouldn't turn that boost up too far. As a rule if you can't get your system to sound right without using EQ'ing, you have the wrong system (woofer, box, amp, or something).