I recently bought a 2003 acura tl and i want to install my pioneer 3000ib head unit i had in my previous car along with my alpine subs and amp i kno how to do all that but i need to know if i can keep the stock sub working and if so how can i hook it up to the new aftermarket headunit thanks in advance

 

Follow the directions in this thread.

https://acurazine.com/forums/audio-video-electronics-navigation-22/keeping-factory-sub-when-adding-aftermarket-headunit-99-03-tl-326253/