If you are going to the trouble to add a dedicated circuit, go ahead and use 10 guage wire and a 30 amp breaker. You will never be sorry. On a 20 amp circuit with only one light and my system, when the four amps (2 dual monos; I run mains and subs on matching amps and preamps.), all occasionally draw power at the same time, and the light dims for an instant. My amps only have one chip per channel. It regulates the power supply. Occasionally, I believe, all four channels of transformer filling current fill a total of 16 giant caps, which causes the flicker. It does not happen now that I ran the 30 amp wiring. Remember, a 20 amp circuit is really only 15, because 75% is what triggers the breaker. If you look at extension cord packaging, the ratings for 14 guage and 12 guage are 13 (Legally rounded from 12.5) and 15 amps, or 75%. My amp transformers are 500 watts x 4. Add in a good sized power supply for the two preamps and the 25 pound cd player (big transformer), then say we have 2200 watts divided by 110 volts and we have a possible draw of 20 amps, one third more rhan a 20 amp circuit is designed for. The chips regulate cap filling, so it does not blow breakers at turn on.
Amplifier Starvation
Just had an electriction come by to give me an estimate on a dedicated 20 amp line to my music room. Because of the room's location, it creates a major installation PITA, and so I we decided to wait until my roof is replaced for a more direct and less invasive installation at that time. In the meantime, my fears were comfirmed. My room is wired with 14 gauge. I kinda knew this already, but now that it was confirmed today, it kinda bothers me a little more. Ha ha. I can't help but think how much fidelity is lost because of the bottle neck of the AC delivery to my power amp. I was hoping that he would tell me I was wrong and that the room was wired with 12 gauge and I could sleep a little better tonight. No dice. 😁 The elctrician told me that he felt that it wasn't such a big deal, and that as long as the equipment was receiving proper voltage, I should be just fine, even with the 14 gauge. He said I should be more concerned with the motor load in the house and any hash it creates on the line being more detrimental to the sound than the 14 gauge. Maybe with my class D arc ds450, it's not as big of a concern than someone with a big hunkering pass labs. Who knows. Still bummed I wasn't able to get instant gratification today. Anyone that has gone from 14 to 12 chime in? Is it really not worth agonizing over, as long as the circuit is dedicated already?