Finding a specific cable

That type of cable has high capacitance. Not good for some amplifiers. You can craft similar from ordinary ribbon cable if you must have flat cables. Better performance can be obtained by using woven ribbon.

P L E A S E  read these before plunking down the DoReMi

Cables: Time is of the Essence, Part 1 – PS Audio

Cables: Time is of the Essence, Part 2 – PS Audio

Cables: Time is of the Essence, Part 3 – PS Audio

Cables: Speaker Cable Design, Part 1 – PS Audio

Cables: Speaker Cable Design, Part 2 – PS Audio

Unfortunately, I need a 40’ run for. my speaker cables or interconnects (one or the other). I’m looking for the best options.

Interconnects should take up most of the distance.

Many esoteric speaker cables have LC properties that can wreak havoc with some amplifiers, especially with longer lengths. Eight feet is more than enough length for most home systems.

Balanced only pay benefits is noisy environments. Improperly done, they can be worse that unbalanced.