I know this is an old thread, but i Just installed a 20 amp dedicated line for my system, and installed a Cardas 4181 outlet. I was completely amazed and satisfied with the overall result.I am running Sugden MPA-4 mono blocks, and have a Saturn Audio 103 Power conditioner. At any given time i have 119-120 volts coming out of the wall, 1 have a solid 124Volts coming out of the Saturn feeding all of my gear. I highly recommend this upgrade, the results were way bigger than i had anticipated.