Dedicated audio circuit question about the breaker

Arc is safer.  Leave it alone. :)

Don't change inspected work. Your insurance may not pay up on a claim.

@ JMPHOTOGRAPHY, As the two post above said leave it alone. Ask the electrician, why the arc breaker was put in.

If you so much as look inside the panel you are doomed. Doomed I tell you. What state do you live in? I wouldn't come within two states if you even thought about looking inside a panel. This whole region of the known universe is threatened. The Tunguska event of 1908 flattened half the Russian taiga, and all because some peasant thought it would be okay to change a fuse without calling an electrician. 

Sorry, but I am just not as good at making up nonsense as some others. I try. But perseverance only goes so far when up against sheer talent.

You only have to look at MC's set-up to realize that he did look inside the panel. He's never been the same since. Heed the warnings.

Just leave the ARC fault breaker in it will have no affect on the amount of current to your receptacles. 

Like others have mentioned leave the breakers alone.   You can only go so far upstream in the quest for perfect power.   With all of the audio tweaks (good or snake oil) out there I have not heard of anyone marketing "audiophile" breakers (yet).

AFCI breakers are a PITA in certain situations.
There is great debate on the validity of "safer" vs standard breakers.  I will not engage in this debate.

OP, If you have no trip issues turning your system on and off then consider yourself lucky and leave well enough alone.  If you have trip issues then grab a beverage and prepare for a long and heated read in regards to AFCI breakers, NEC & consumer electronics.

If you have trip issues as this is a new house call the electrician and tell him or her to correct it.