Better Cables Blue Truth Interconnects (Silver+Copper) w/ETI "Bullet" RCA
(2) (1) 2 meter pair - $87 per pair
(1) 3 meter single ( I used it as my sub cable ) - $57
Here's their marketing pitch:
BLUE TRUTH: Our Flagship REFERENCE Audio Interconnect!
Silky-smooth audio using our advanced TFE (TeflonĀ®) insulation. This dual conductor twisted pair (38 individual 99.999% pure Silver coated copper conductors make up the 2 conductors) plus an equally pure Silver coated copper shield will put you in sonic heaven. The hybrid construction gives all of the benefits of silver (dynamic high frequencies) and all of the benefits of copper (deep, tight bass response).
Terminated with the AMAZING Eichmann (ETI) Bullet PlugĀ® RCAs
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I found an online dealer who has info on the RCA's
https://www.vhaudio.com/bullet-plugs.html <---link I think their price for a set of 4 connectors is $79 plus shipping , then there's cable needed and soldering to do and if you want to get fancy , adding techflex etc.