Unless your big on bass notes and SPL no need for crazy power upgrades etc. Most of those upgrades are to maintain voltage, not because there's a power supply bottleneck. I run everything stock and had about 2kw using 4awg from the battery and a/b power supplies in the amps. Never had dimming issues or anything. Voltage stays around 14.0 to 13.8 in the rear. Hope that helps.For the alternator idea, firstly im not going to be running more than 1800 watts rms, not two kw, next the audio shop who is building my box who has a world championship told me personally that all i would need is a battery since the owner has 3400 watts rms and hes had much experience, id trust that unless you can show me otherwise, and id appreciate if you did.
Dimming is usually indicative of poor grounding. Music is so dynamic and most people "rock out" at around 110decibels. You won't be pulling much at those levels.
