running wire in walls/floor

Any good custom installer can do this for you. Ask some good shops in your new town (or better yet a friend in the new town) who they'd recommend. You should expect someone to come out and look at the house and give you a professional quality estimate on the work prior to beginning. Make sure you address how the wires will be terminated, if at all, and make sure the installer understands what you want. Don't pick the low bidder, pick the best bidder. Good luck.

Make sure they are licensed (if they have to be in your location, some areas low voltage installers don't need licenses like electricians), bonded, and insured.

I always wondered why when constructing a house or a sound room ABS piping can't be run in walls or between floor joists as a conduit for speaker cable, that way if you do think that speaker cables improve music reproduction and that upgrades can be had to make a difference you could simply tie the end of the new one to whatever was passed through and snake the new stuff in there. Am also wondering if the ABS would not add an extra level of insulation or at least RFI isolation to the cable. Just a thought.

I love your idea , Pbb