I want to build a system utilizing 2 15" BTL's. What I need to know is what it's going to take to power these subwoofers properly. I've considered using a Rockford Fosgate 4000 Watt Amp, is that going to make the grade? I've heard that the BTL's need about 1500-2000 Watts RMS, so I have a good idea of what kind of amp I'm going to need. The real question is, if 4000 Watts is what I need to move them, what do I need for the charging system? The best high output altenator I've found is 180 Amps. I plan on upgrading all of the charging system wiring as well. Am I going to need to use multiple batteries in addition to my regular car battery and upgraded altenator? A lot of people seem like they get away without using secondary batteries but the Jeep Cherokee's stock alt is rated at around 70 amps. I have a good idea of what I need to do in the other aspects of the build, but I've got two BTL's on the way and I need to start ordering things. I know it will be worth all the headaches when it is done. Basically I've just gotten tired of friend's 1500 watt systems running dual 12" subs in their mom's ford taurus. It's a lot more costly to go big, but hey, you can't lose your hearing twice. Better make it worth it the first time.

Edited April 22, 200916 yr by dpalmitessa

Enough power to get them loud enough for you is good.

There is no "minimal" power requierment for a subwoofer.