Help me pick some new or used speaker cables

Regarding the Zep show in 1969, the answer is yes.

Zavfino Prima MKII cables $700 a pair for 2.5 meters, 30 day return policy with 15% restocking fee, partially broken in so they only require about 100 hours of additional break in, direct to consumer so no dealer mark up, OCC copper, cryo treated, 9 AWG cable

Save your money on this snake oil and use a fairly heavy duty stranded lanp cord line. Never heard any differance between most cables (blind test - In AES test facilities)

The best High frequancy cables are from litz cables in new york. BUt thesse are designed to carry high frequancy signals with very low loss becasue they are power cables. Litzwire dot com is the company. 

But truely just a starnded heavy duty cable with half decent connectors and keep your length of cable down to a minumum. 

THe other thing to watch out for is balancing your impedance to your capacidence  with longer lines. Flat foil cables work very good other than going to a litz type of cable. Everybody should use the blind listening test for all audio choices, Just wasting your moeny otherwise.

Supra, Sword Excalibur - excellent cables for use with tube gear. I use them in 8' lengths w/jumpers too on my Audio Note, AN-e. Just my opinion...

Save your money on this snake oil and use a fairly heavy duty stranded lanp cord line. Never heard any differance between most cables

@stealthdeburgo  Well, you’re in the vast minority here.  Sorry you are apparently unable to hear differences in cables but great that you can get by with just cheap lamp cord.  You’ll likely find a much more captive audience over on Audio Science Review (ASR) for what you’re peddling.