Not necessary really, a pair of 20amp dedicated circuits are nice, but beyond that you need not go through much more trouble. For my subs I am drawing from a 30a breaker and pulling close to the max approx 4000watts if needed, but that is rare, that is why the internal caps on the amps and switching power supplies are there. you'd have to be running VERY high level sine waves for extended periods of time to even think about tripping breakers even at 20watts if they are dedicated. My setup is as follows:
1-20a dedicated line with APC power conditioner, which the denon4311, DCX2496, xbox360, directv box, router, modem, tv monitor, BD player, are all plugged into
1-20a dedicated outlet for the behringer EPX4000 and emotiva xpa-5
2-30a dedicated outlets for the pair of Labgruppen 14k's
Never even close to any issues and ALL are rack mounted right near my MLP
I simply took a sharpie and colored over the light displays. Dims it down real nice, whilst you can still see the response, just not blinding or distracting.