Dedicated 20 amp circuit. 10/2 or 10/3?

I would run a sub-panel near your equipment with plenty of amps to the sub-panel. If you have high powered amps run them on their own circuits which could be up to 20 amps each. Most likely you can power all your other equipment on one 15 amp circuit.  The amperage draw by your amps will definitely increase based on volume level.  The other equipment will remain fairy consistant regardless. I ran a 100 Amp sub-panel with Two 15 Amp circuits with 12/2 wire and one 15 amp circuit for the tube preamp, streamer, TV and modem/router.  I used to see the voltage slowly drop from 121 to 118-117 when the amps were driven hard.  Now it stays pegged at 121 regardless.  

Ok. I installed my dedicated 20 amp circuit using 10awg romex. All is good!

I will install 3 more dedicated circuits for subs and accessories next. 

Now your next dilemma is what to use for outlets...

ozzy

+1 ozzy

As my system has improved, I was forced to recognize that my dedicated 10/3 runs sounded worse than a shared, daisy chained 12/3 run. My advice to all, do it right the first time and buy something like Hidden Treasure or at least get cryo'ed romex from vhaudio, even then I would probably recommend 12/3 if possible. The 10ga sounded better in terms of dynamics and low bass, but the 12ga sounded much better in the mids thru the treble. You could build a couple DIY power cables with 12/3 and 10/3 and listen for yourself before you have the work done. I wish I had.