How can i install a subwoofer even if the vehicle already has a stock sub?

Question

How can i install a subwoofer even if the vehicle already has a stock sub?

Answer 1

Just put it in. However you have to match the impedance of the subs. so if the existing is 4 Ohm, you need 4 Ohm to put in, or you can use large audio transformer for impedance matching with minimal loss. You also have to look at the frequency response, and the power output.