New electrical wiring specifications

Pretty much like the others mentioned, I did three 10awg Romex, 20 amp breakers, same phase, combo of PorterPorts and Oyaide R1 receptacles,  new grounding rod.. I use one line exclusively for amps and subs, never use power conditioner with these, another for rest of system, this has power conditioner, third line is mostly excess for me, although running one of my streamers off it at present.

All else aside, make sure it's all done to code.

Don't forget to use two 9' copper earth ground rods wired in series with #6 solid core ground wire to the panel ground landing. 

Interestingly, the rods need to be 9' earth covered but not necessarily driven vertically. what you want is grounding to damp soil. If you are lucky and have an iron well casing that is the ideal earth ground.

HI All, 

I'm going to throw this out there as I'm at baffled with this issue. I too just completed a new home build with a dedicated audio room. The power is fed via underground conduit to the panel. I ran 3 #10 circuits all on the same phase to the room, 1 for my tube mono block amps, 1 for my subs and 1 for the rest of the equipment. The big disappointment is a nasty 60 cycle hum. It's not just limited to that room it's in every outlet in the house! I had a master electrician here 3 times now to no avail. We installed a second earth ground rod on the panel which he claimed should fix it, it did nothing. I also have a Seimens whole house surge protector but have the breaker turned off for it as when it's on the the hum doubles in volume.

At the suggestion from another user I bought the little red Amazon plug in circuit tester. It's showing me I have 7 milliamps going  to ground, Google says this is quite bad. I turned off the all the breakers and that didn't change anything it's still 7ma. It's so bad that when I turn the whole house surge on you can hear the toaster buzz!

At this point I have all three systems (different rooms) plugged into Emotive DC noise units just to be able to use them. Solid state amps can't be used at all that's how bad the buzz is. With the Emotive the buzz is still there just quieter. I know this can't be good long term for the equipment and definitely not for my nerves!

Any suggestions on a next step?

Thanks,

K 

Get a different electrician. 
Start turning off one circuit breaker at a time.