Not Helpful 2 Helpful Do subwoofers wear out cars faster? Disconnect the negative battery terminal. If you're using an after market head unit, go to an electronics store's stereo department and ask for a wiring harness from your car to the after market head unit. Where do you get lock nuts for the power and ground wires on my amp? How do I hook a subwoofer up to my car? Make sure the control wire from your deck to the amp is connected.
Get your capacitor as close to the amp as possible, and use the same ground as you did for the amp.
How do you connect a subwoofer to an amplifier?
If the sound increases with the increase in engine RPM then reduce gain of the amp to resolve the issue. Not a lot of people know, but most aftermarket radios have a way of wiring the rear speaker outputs to run a subwoofer. The balance on your radio may have gotten moved from center to right or left, or your speaker wire may have come disconnected. Article Info wikiHow is a wiki similar to Wikipedia, which means that many of our articles are written collaboratively. I cannot turn it up any higher than halfway without my amp going into protective mode.