HOW TO - Electrical System Design for 3 AMPLIFIER + DSP Car Audio System!

Is our alternator big enough? What size wire do we need to install our amplifiers? How do we connect everything and what wire distribution blocks are needed for the positive and ground wire connections? What fuses do we need? I'm currently working on installing a car audio system with 3 amplifiers, a DSP, 6 speakers, 4 subwoofers and more! How does it all get wired, and what wire gauge size is needed? Let's make a plan!