If I may ask (because I'm installing two 12" subs myself) what did you do for electrical upgrade to handle these? Did you get a new alternator? Do you have a cap or separate battery? Thanks!
Sorry for the late response but I've been on vacation and the wife would not let me touch the computer! lol...in regards to the speakers, the alternator I have installed works perfectly fine with the set up. I do not have a cap or separate battery either. I did just install a 1100W amp to run my interior speakers and I noticed the amp meter for inside the car rises quite a bit when the music is up loud. I will definitely look into either installing another alternator or putting in a capacitor.