You can leave the stock amp to drive the stock sub and any other speakers you do not replace.hi, i was hoping you would respond and i appreciate that you did. i am a full novice regarding this subject. maybe i wasn't clear on what i was asking. i would like to install a new amplifier to drive all new speakers in the car. I've read your thoughts on replacing the subwoofer. i am asking if the amp to the subwoofer would need to be replaced or if i can continue using it in my scenario. thank you for the help.
I was trying to describe that you will tap the new amp into the wiring for the old amp (well, your installer will).