It matters, but not quite the way you think. No system really needs the extra amps. One 20A line is plenty. Going to 30 might be better but in terms of sound quality is really splitting hairs. Not only the breaker but the wire changes, and then outlets, and its just a whole lot easier to stick with the 20 and put your time and money into other things like power cords that make a whole lot more difference.
This from a guy who has wired his room several different ways and heard and knows whereof he speaks.
This from a guy who has wired his room several different ways and heard and knows whereof he speaks.