Regarding adding capacitance. In an automotive system you have a closed DC system that can benefit from capacitance being a buffer to short bursts that would cause sag in the whole system. For an amplifier plugged into a wall socket the sag is something that would generally occur after the power supply inside the amplifier. And you want lots of capacitance as part of this power supply in order to play the dynamics properly. I am not suggesting you dismantle your receiver and add capacitance to the power supply as the power supply needs to be designed as a system to deal with this extra available energy.
I still don't have those 4 EP600s all up and running. Now that summer holidays are out of the way I think it is time.
