you guys dont know mush do you its a 250amp ohio alt we dont need to all be steve meade and run 4 alt i still have use of ac and power stearing haha the alt runs at 15.3-15.5v daily it never drops under 11.8v with amps at .5ohm each on music reason why i have the 7 kinetik 2400s once the music stops it shots right back into the 15v mark we find it that it only takes one alt to power these systems if you have enuff batterys and the power to back it up this is also how my teammates do it and one can bassrace a 159.9db