Caps themselves are a drain on the battery/alternator, and they do not charge up instantly... They can take anywhere from 5 seconds to a minute depending on the size of the cap. Why is this a problem? How often do you have bass notes spaced very far apart? Almost never. If you have a HUGE system and want to add a cap to it, the most efficient way of doing it would be to buy a bunch of small (1/2 farad) caps and wire them all together in parallel so that they function like one capacitor when dischaging but all charge seperately and thus faster. Of course, that would be very expensive and take up a lot of space. If you have electrical power problems, your best bet is a high output alternator (or more) because the only thing that powers your system is the alternator when the car is running. The battery is just a reserve and a cap is just a band-aid. Caps will help, but they are not the only part of the solution.
And yes, I do have a cap. A 3 farad one. But I also have a 200 amp alternator and 1/0 gauge power, ground, and alternator wiring for everything. Running at 2300 watts, I only get slight dimming when I turn the system up all the way (too loud to be sitting inside of the car without hearing protection) and it is not moving. If the truck is moving and the alternator is not spinning at an idle speed, then I have no dimming problems whatsoever.
A 760 watt amp, assuming your alternator is functioning correctly and putting out 14.4 volts, will draw only 52 amps of current. I believe that if you have current draw of more than 60% of your alternator's output capacity, you will have problems. Even if you have the 95 amp alternator, you should be fine... I suggest you upgrade your wiring to a larger gauge, or possibly replace your alternator with a 130 amp (if you have the 95 amp) or even spring for the 200 amp. 760 watts does not need a cap by any means.
....check my post under the for sale section
