Isolated or dedicated lines for audio ?

Brainwater, It depends on what you want. Dedicated is usually just 12-2 with/ground or 10-2 w/grd romex. Use a good quality receptacle like Porter Ports, or a good quality 20 amp hosp grade duplex receptacle.

Dedicated circuit with an isolated ground is usually installed in metallic conduit, either EMT or MC flexible conduit. Conduit is used to help shield RF noise. In this case an isolated ground type receptacle is used. The receptacle equipment ground wire is an insulated wire.

One thing to consider in either case is the length of the branch circuit runs. Long runs tend to invite ground loop problems. If the runs are long sometimes the equipment ground wires will need to be tied together at the outlet rough-in boxes, that tends to mute the isolated insulated ground application.

Jim

thanks everyone , brent

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One more note. It is well worth it to buy the wiring and send it off to be double cryoed (www.cryogenicsinternational.com) before installing the wiring. It is a great improvement over non-cryoed wire. Since this is a one shot deal, you should do the cryoing since you will not want to re-do the wiring later.
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Keep one more thought in mind. The dedicated lines will take time to break in just as would any interconnect, spearker wire or power cord. A neat trick is to get the wire, get it cryoed and then terminate it with a male and female plugs and then run your refrigerator with the wire until you install the wiring (the longer on the refrigerator the better, 3-4 weeks would be great, longer would be better).
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Rgds,
Larry
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thanks larry

Cello, can you shed any light on this?

For wire, does flexing the wire after cryoing undue the effect? For example, it would be impossible to pull 10 ga solid core AC wire through EMT with bends without considerable flexing.