5000wrms

alright i plan on running 2 18" subs. i have them in my car (91 civic hatch) so its a tight space. they are already in the car there right behind the seats 2 boxes side by side. and the subs are facing me. do i need to switch the amp phase to 180* since they are right behind my head lol or keep it at 0? its pretty much a wall setup. the subs are just angled back a little bit. im not 100 percent sure about the phase setting yet.

haha i wanted 2 21" subs in my car. but only 2 18's would fit in my civic hatch lol good luck with the build should hit nice and lowww