Recommendation for a replacement speaker cable

+1 on the Kimber Kable 12 TC.  I also have the biwire version.  Love the sound, and seems very resistant to noise.   I have them mixed up with all my power and interconnect cables, but never seem to pick up any interference.

AQ Type 8 has served me well for years...very high quality copper solid core and relatively inexpensive.

"" Solution: small diameter solid core strands, individually insulated, twisted, within exterior jacket "  I know a couple of electrical engineers that tried this and seemed pleased with results. Problem is with real life practical solutions there is no fancy set of $$$ name tags you can spout to prove your golden ear critical listening creds with. You were seeking an answer and these guys are seeking peer reviews and accolades.

  It's a funny world. I have people stop in to listen to what I am doing lately pretty often and there are some who look at my 12g zip cord and tell me fancy cables would work better. OK I say, bring your fancy cables here and lets have a listen. They come back but somehow the cables never come with them.

I enjoyed Canare 4S11 in my system for years. Then I decided to pull out my old Goertz Alpha Core MI-2 Veracity speaker cables. As a long term Canare user I can tell you the Alpha Core improved the sonics across the board. A search here on Alpha Core will attest to their performance. They cost in the $150-$300 range new, now sold by the Cable Company.

Alpha Core Goertz | Speaker Cables, Adapters | The Cable Company

The only thing to be aware of is that they are such low inductance that they have been known to, in rare cases, cause some amps to oscillate, and back in the day were sold with a simple Zobel network to prevent it.

Kimber 8TC is an undisputed "great cable, excellent value" proposition.