Other wise, probably behind the radio. If your subs are dual 4 ohm voice coil, and you wired them in parallel positive to positive, negative to negative that reduces the final impedance to 2 ohms. Any ideas as to what could be wrong? I had this same system installed on a gmc sierra and was able to control the bass through the factory radio bass controls but nor sure why it doesnt control it on the jeep? Can you add subs to a factory radio?
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How to hook up an amp and sub to a stock stereo.
Detach the power cable from the battery and attach your amp's power wire to the power cable for your vehicle; leave it unattached. HI i have the same with my sub at home. Applez ArniVidar Reply 5 years ago on Introduction.