H2 150W Rockford Audio Upgrade Kit
 

I recently purchased this product, followed all the instructions for installing in my 04 h2. I finis, tune it on and the sub is thumping even with the radio on its lowest setting and no other sound coming from the speakers. It seems it will not turn down or adjust with the vol of the radio, it stays at a constant. Any help????

Re: H2 150W Rockford Audio Upgrade Kit
 

Do you have a stock head unit??

Re: H2 150W Rockford Audio Upgrade Kit
 

Yes I do