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Tom,

Thanks. I was going to try some 10 gauge speaker wire from Amazon like:

https://www.amazon.com/InstallGear-Gaug ... 825&sr=8-5

Since I am operating in the dark, I assumed I would have to test several long lengths (30-40 ft.) of different speaker wire before installing the best and affordable one in the walls, so any recommendations are welcome.

My current speaker cables are 12 ft. MIT Music Hose from the 1980's.

I found an exciting product that serves the music in ways I never expected. Andrew Heliax plenum-rated micro-wave cable. It is a pain-in-ass to terminate, but WOW is the time and effort worth it!! I ran it under the floor of my living room (aka. music room) and installed SO-259 female UHF connectors to the floor with 8-inch pig-tails through the floor to hook up to my amps in a conventional manner.

The cable itself is terminated with PL-259 male UHF connectors and suspended from the floor joists with cable ties to "float" the runs from the wood flooring. One important issue is to make the cables the exact same length to better support stereo imaging.[/color]

That's a RF cable. RF signals are so small they get easily effected by EMI and other RF interferences. So, they need exceptional shielding. The outer copper tube is the shield.

Can we say, shielding of cables is extremely important in audio use ?

Exactly.

In the "old" days, power cords for CRT monitors used to come with Ferrite Beads.

I wonder if anyone tried Ferrite Beads on speaker cables.

If you were truly fanatical you could put six fifty Ohm coaxial cables in parallel to make a 8.33 Ohm transmission line to match your speaker impedance. For a 16 Ohm speaker only three fifty Ohm cables in parallel would be needed.

If you were truly fanatical you could put six fifty Ohm coaxial cables in parallel to make a 8.33 Ohm transmission line to match your speaker impedance. For a 16 Ohm speaker only three fifty Ohm cables in parallel would be needed.

Not much to be gained matching impedance at audio frequencies where the cable length is <<< less than a wavelength.... Wavelength of heliax at 30kHz is 8km, proportionally longer as you go down in frequency....

Roscoe