so i just hooked up a new head unit in my car and also a subwoofer and amp and for what i know and what everybody else has seen its all hooked up right. when i play my music the subwoofer gives out everything the other speakers do. but no bass. I know for a fact the subwoofer works and i thought it was just the amp so i got another one. but its doing the same exact thing. I've tested all of the wires that are connected and they're all getting power. I don't know what could possibly be the problem. I even changed all of the fuses in the amp and everything. So anybody have any suggestions on what it could be?