dedicated line=holes in the drywall?

Poorly worded and unclear to the max. The wire has to get to the system somehow. If it doesn't go through sheetrock then it goes through floor. The usual procedure, what I did, is from the panel go either down under the floor or up into the attic. Mine was easier to go under. Had to drill a hole in a joist at one point but basically it hangs underneath. Then at the room drill or cut and slide the wire up the foot or so it needs to go to where you want it. Then from inside the room you cut your outlet box hole, and look or fish around until you find the wire.

I've done the same several times for cable, HDMI to overhead projector, and plumbing. Its all the same. Only different.

An electrician will know how to do this correctly. He will cut out a piece of drywall which will fit a duplex receptacle and box. Or he’ll use an existing space.

He will install new breakers in the service panel, attach the Romex and find the best route to run the cable.
He’ll pull the cable to the exact location and wire the hot, neutral, and ground to the receptacle box.
No pilot holes or extra cutting in the drywall involved. 

If the electrician knows what he is doing, he will know exactly where to cut the hole for the receptacle box. My house was built in 1921 and I had 2 separTe circuits installed in my living room and another installed upstairs on the second floor of my house. Only 3 holes were cut out for the receptacle box.


Now, if you have a friend do it who says “I have done this before”, run the other way and hire a licensed electrician. 

First time I had it done, it went through our crawl space and up into the audio room. No extra holes. Next time, the electrician came out, looked at the job (second floor room, panel in the basement) and couldn’t figure out how to do it without running outdoor conduit.

My point is, it depends entirely on the location of panel and audio gear and also the construction of your house. An electrician will be able to tell you, and many will come and give a free estimate, which I’d recommend.

I agree with the previous poster who said, don't have it done by an amateur. Use a licensed electrician only.

As a retired electrician I can say it depends. There are just way too many variables to make a simple yes or no answer. Attic access? Raised floor, or slab? A GOOD electrician will at least be able to do it with the least amount disruption, and holes, as possible.

What crn3371 said, +1.

It depends on where your start hole is and finish. If your going over 4ft....you will. Or Learn to spackle...

Another +1 for @crn3371 ’s post. As a homeowner who’s moved a lot, I’ve learned running power can be simple and nondestructive, or it can be a royal pain.

A reputable electrical contractor told me the only reasonable way to get grounded power into our 2nd story room here was to run lines outside in conduit from the basement breaker box to the 2nd floor. I decided against it. In another house, it was trivial to run lines through the crawl space to a first-floor room.

Good luck!