JPS Labs Power AC IN-Wall Cable
https://www.enjoythemusic.com/magazine/equipment/1002/jpslab.htm
Summary
If your system is toward the lower end of the high end, or you're likely to move within the next few years, and the installation is relatively easy, I'd probably recommend just going with a standard wire dedicated line. For a hundred dollars, and an evening playing with an electric drill, a dedicated line is a true bargain.
On the other hand, if you've got some nice mid-to-top quality components, and if your life is pretty stable, and if the installation is not too complex, the $1000 to $1500 upgrade to the In-Wall is highly recommended. That's a lot of "ifs", but you could easily spend a lot more upgrading a single component. With the installation of the In-Wall you can improve your entire system, getting the best from every component--now, and when you upgrade them in the future. It is not a "jaw-dropping" improvement, but one that audiophiles with educated ears will easily appreciate. The path to the highest levels of music reproduction is not simple, and rarely inexpensive. The JPS Labs Power AC In-Wall cable definitely took me higher up the mountain and gave me a better view. And for the high rollers out there, building new homes with built-in home theaters and dedicated music rooms, this wire should be considered standard equipment. Don't think twice.