[ctviggen]

Joe:
When you run the dedicated AC line(s), use either 12 gauge or 10 gauge (preferred). Have the electrician use 12/3 or 10/3 which has 4 wires, hot, neutral and 2 ground wires. Have him use both ground wires from the receptacle back to your panel. This will help lower your ground impedance back to earth which in turn will lower the noise floor of your audio system.
Chris H.

I thought 12/3 or 10/3 had two hots (black and red), a neutral (white), and a single ground?  For instance, see here:

http://www.make-my-own-house.com/diagram-electrical-wiring.html

I think having two grounds is a violation of the NEC. 

[oneinthepipe]

I used 12/3 NM cable (I had a spool of wire laying around) for my dedicated circuits, but I didn't use the red wire, and I merely terminated the ends with separate wire nuts.  Even if the increased effective gauge of the ground wire resulted in some improvement, I would be concerned that a subsequent user would mistake the red wire for hot (which might be safer than mistaking a hot wire for neutral!).  I don't think that the local code permits multiple earth grounds, if the poster was suggesting an entirely separate ground.  I try to be very careful with electrical wiring.  Edison argued that AC was a killer, but Westinghouse prevailed.

[jeenie67]

...and related electrical thoughts.
     Hello again and a thought to the grounding of a systems electrical wiring. 10 AGW is the best you can use; it's cost over standard 12-3 is minimal. In my apartment I ran a separate feed line from the mains panel to a small circuit breaker box located in a closet near my system. The important issue here is the separate earth ground wire which is strapped to a 4' pipe sledge hammered into the ground directly below a window in my living room which attaches to the ground bus in the mini circuit breaker box. The hot and neutral wires are 12 AGW tapped off the main breaker panel. I have two breakers, one for the stereo and one for the TV and related components. Total cost, less than $50. Time expenditure, about two hours. Reliability, system electronic security, and sonic advantages, very high. Just wanted to pass this along. For a homeowner, having a separate mini electrics panel, breakers, and grounding is very cost effective with maximum return on the investment. Jeenie

[joeling39]

Thanks for the advice. Very informative.

1) The room will be on the first floor of a 2 storey house

2) I am quite keen on the double wall with insulation but it's not common in my part of the world (Malaysia)

3) I am quite keen to maximise the potential of my system by getting a proper electrical system / circuit in place. Some good info here. I will consult more knowlegeable persons on how to do it without breaking the law in my country

4) I will be using some room treatment but still not sure what types though.

Regards,
Joe Ling

[jeenie67]

....check out my DIY sound treatments in the development stages in the "acoustics" threads. I'll put the pic here for you too. Glad to help. I'm immobile with a foot injury so time spent giving ideas is .....just nice to do.   Jeenie.