The trick is to sell the greenest sound system possible to green battery people like elon musk, Greenpeace and all the million green people in California and europe and everywhere where apartments are small with high rate of electricity. These people wants green electricity from their solar panels and local windmills. so connect a battery feeded by GREEN electricity and charge your green sound system. We need clean air, so adopt energy stockage where a small amount of electricity charge a powerful adapted battery and the simple green battery is more powerful that almost all conventional power supply. The new crunch 12 volts car amplifiers are completely linear. I just checked their specs and they perfectly follow the impedance by no voltage drop from 2 ohms to 8 ohms.
At 8 ohms the power is 100 watts rms, at 4 ohms it is 200 watts and at 2 ohms it is 400 watts. almost all amplifiers on the market are not linear, the voltage drop between 2 ohms up to 8 ohms, provoking huge idiosyncracies on the crossovers, drivers, timing, wiring and feed back system. Please avoid passive crossovers that are costly, power rubbing, also they are impossible to push to 48 decibels per octave slope. Conventional outdated amplifiers with unstable power delivery plugged to stereo speakers with non-perfected crossovers cost more and perform way less, annoying your guess and ruining the economy with costs and pollution.