high to low

Hi, i recently bought a new car audio system (subwoofer, amp, and a high to low level converter). Although after adjusting the amp gain to the max the subwoofer barely moves and underperforms. I know the amp isnt the problem because its supposed to deliver 1900 rms in 2 ohm and my subwoofer is...

I'm having a problem with the LOC that I installed into the factory stereo. Regardless of which speaker I connect the LOC to I get the same problem...when I have the door open everything is ok, however, when I have the door closed, it seems like a signal gets sent to the sub amp and it produces...