I can’t tell y’all how many times in the last 40 years of my career in A/V people have always missed the first fundamental. They pile up a stack of humming electronics and wonder why their performance is underwhelming. Think about power first. Add up the greedy electrical cravings of all the equipment - then spot it all an additional 25%. You need the available power to do what you want and give the amps a chance to breath. Keep in mind a 15amp a/c circuit has 1800 watts available and a 20amp has only 2,400 (both with 120volt US standard). And be sure to add up every bit on that circuit - be sure to include lamps, clocks, and chair warmers!
Two 1,000 watt per channel amps, preamp, tuner, DVD, computer, cable box, D/A, equalizers, monitors, and that neon lit beer sign with the dogs playing poker are going to suck dry a 15amp circuit. Your result will be a rather anemic.