High quality in-wall UL-C2 rated 10-gauge A/C wiring ?

The Audience wire is interesting, but I would actually just use cryo'd 10awg Romex myself.  VH Audio sells cryo'd 10-2 Romex for 2.99/foot, or $469 for a 250 foot roll.  The Romex will meet code for running inside walls and through attic areas.  Other wire may or may not (and might have to be run in conduit).  Some people have said they get better results with 8awg THHN, but that is going to be stranded and also needs to be run completely in a conduit.  The Romes is solid core, which is better in my opinion (even if it doesn't quite have the current cabability of 8 awg).

@ieales - I disagree.  I did testing with a double-run of 14awg romex (that's 2x14awg which makes an 11awg total).  The result was just not as good as a standard 12awg or 10awg romex.  The smaller 14awg just cannot respond to on-demand current as well as the larger awg romex.

@jea48 - interesting read, but the problem I had did not relate to ground loop buzz / voltage inducement. I believe now it had to do with the voltage in the tiny 14awg wire being restricted by the high dielectric constant on the insulation (something I have definitely found on small gauge wires). On a larger 10/12awg conductor, there is less percentage of voltage restriction with more area/mass of conductor. My result of 2x14awg romex was weak bass/midbass punch. A single 12awg gave much better impact/sound.

As far as the 2x14awg romex test was concerned:
1. Take two 50 foot lengths of 14awg romex.
2. Take the two black hot leads of both cables and connect them to the same 15A/20A circuit breaker.
3. Take the two white neutral leads and connect to neutral bar in sub-panel.
4. Take the two bare ground leads and connect to ground bar in sub-panel.
5. Run the two 14awg romex cables to outlet.
6. Connect the two black hot leads to hot connection on outlet.
7. Connect the two white neutral leads to neutral connection on outlet.
8. Connect the two bare wire ground to outlet ground.

So, essentially, I am doubling the size of the wiring from circuit breaker to outlet. This is the same thing that happens inside larger power cords.

Yeah, seriously.  I have experienced this same exact thing in power cord conductors (which transfer the same 60hz A/C).

Yup, I totally know that it's not to code.  My point was that 14awg is really not enough to supply good current to audio equipment.  The on-demand current draws are just restricted by the small 14awg wire along with the high dielectric insulation (this is not anything like foamed polyethelyne or teflon found on many good power cords).  While ieales seems to think that 14awg is perfectly okay for 20 amps of current (and it may be for general purposes, but highly not recommended!!!), is it definitely not acceptable for the fast current draws required by audio equipment for good sound.  You guys can laugh at me all you want, I really don't care because I know what works and what doesn't.