Dealing with a power amp that need 20A connection

I contacted ARC service and asked a question about this amp over two weeks ago, but no response yet.
Most of time, it is more responsive and sometimes more detailed response I get from online forum than the manufacture's customer service. 
So far so good at moderate volume (9 o'clock position).

@ ihcho

Did you read page 2 of the 150M owner manual?

Either ARC had a lawyer write it, or ARC just stopped some guy off the street to write it.

Quote from page 2.

The AC power source for the amplifier should be capable of supplying 15 ampere for 100 or 120 volt units,

Yeah, really? 15 amperes..... I wonder how many layman read that as a 15 convenience outlet circuit meets that statement?
I can tell you how the majority of electricians would read it. The equipment manufacturer says his piece of equipment needs a 120Vac 20 amp circuit.

Here’s the thing though. Technically ARC meets UL, and NEMA safety standards. It is also in compliance with NEC electrical code. The continuous (repeat continuous) FLA of the amplifier is not greater than 12 amperes. That complies with NEC, UL, and NEMA, electrical safety standards for a 15 circuit.

And then in the next paragraph it says;

For the very best performance on domestic 100 or 120 volt circuits the 150M should be connected to its own AC power circuit branch protected by a 20 amp breaker.

its own AC power circuit branch protected by a 20 amp breaker.

Normally it would be worded, 20 amp branch circuit. Per NEC the overcurrent protection device, breaker in this case, determines the size of the branch circuit.
For a 20 amp branch circuit the bare minimum branch circuit conductor, wire, size is number 12awg. You can go with a bigger size, but not smaller than #12awg.

So why all the dancing around the branch circuit size ARC recommends for the amplifier? The vast majority of homes in the US convenience outlet circuits are 15 amp. (15 amp breaker, #14awg wiring). Living rooms, bed rooms, dens.
Jim

I also have read that statement: 

For the very best performance on domestic 100 or 120 volt circuits the 150M should be connected to its own AC power circuit branch protected by a 20 amp breaker.

That's why I thought about having a dedicated 20A circuit for this amp.
However, so far it seems to be fine with 10awg 15A power cord.  

As I said before, doing it the 'right' way would be the safest course, and probably give you a better outcome overall, but, I think running it with an adapter is fine as long as you don't push it.
Even if you do, the breaker should kick in, and then you'll know how far you can go.
B

Jim, I'm curious to hear your thoughts on pig-tailed vs. daisy-chained wiring of outlets, if you have the time. Not necessarily per audio requirements, but in general.
TIA