[Anthony]

I have 2 dedicated. 1 15 amp, and 1 20 amp (single plug). In my case, I'm close to the breaker panel, so grounding isn't a problem.

you may be surprised how little many HT components draw. Power amps being the noticable exception. You may find all those dedicated lines are unnecessary. Do you have an equipment list? If you need lots of plugs throughout the room, they can be on the same few circuits. One 20 amp circuit is good for 2400 Watts sustained. If you have/need more than that then of course, you need extra circuits.

Just trying to save you some money and headaches

 

[Anthony]

Oh, and if they all tie in at the same sub panel or main panel, you should be fine on grounding. Ground loops are usually a problem between external signal and power or power circuits that are on separate sub-panels.