I just bought a woofer with an amp for my car and will be installing it soon. The amp i have has a Low-Pass Filter which means that my woofer will only be playing bass. This is great, but what i also want to do is remove the low frequencies from my regular car speakers, and only leave mid and high frequencies on them since they are on the doors and the bass on them makes their plastic elements make annoying vibration noises. I was searching for such a filter but didnt find one. Any link, directions or explanations would be greatly appreciated. Thanks!