RCA Interconnect recommendations

"Do you mean Quadlink or Hexlink instead?" 

I meant Quadlink!   My bad

"If so I can share first hand most of the older QL/HL 5C cables from Cardas are nowhere near what any of the next iterations past few decades of Clear, Reference, Reflection, Beyond series. Cardas periodically shares there are fake counterfeits and junk copy Hexlink out there too."

Yes, these Quadlinks are about 30 years old.  My dad bought them after he retired when he was working at a high end stereo store, so they are legit. 

"With cables, once you get to a certain point, it  Becomes the law of diminishing returns."

Totally agree.  Maybe people with great ears can continue to hear significant sound improvements up the price chain, but for me, with somewhat diminished hearing, I can't justify spending more than $200 to $300 on interconnects.  

Go,to Blue Cables spend $40 on interconnects and I bet you can hear the difference with 1000$ cables…

Here’s a pair of Acoustic Zen Matrix II interconnects for $300 that cost $920 new, and they should strike a nice balance as they’re very natural sounding and neither bright nor veiled. If they don’t work out for some reason you could easily sell them for little/no loss so very little risk.
https://www.usaudiomart.com/details/650160451-acoustic-zen-matrix-reference-ii/

If you’re looking new these Ice Age interconnects use high quality copper and are cryogenically treated and are well within your budget, and I believe they offer a good trial period.
https://iceageaudio.com/ice-age-audio-store/ols/products/pure-copper-interconnects/v/PR-CPP-RCA-3-FT

A couple months back I bought some real expensive cables from a well known cable company, he is a one man band and makes the cables does all that nitrogen thing breaks them in for a couple days.a one meter rca interconnect was 600$…this guy is very well known…wont mention the company dont want to get sued..lol

Did a blind test with lots of people they could not tell the difference between the $40 Blue Jean cables..

my system is Pass Labs pre and amps..Denafrips Dac and New Ontech Dac

‘Volti audio speakers they have a awesome midrange horn everything comes through..

the guy was very gracious and took them back, if you do buy expensive make sure there is a return policy

There is one you might consider.
Pure silver in Teflon ultra low capacitance and reasonably priced.
Both users and reviewers have given it high marks and several reviewers,
rather than keeping the review samples, kept them and bought them for themselves: https://silversolids.com/revbuysB.html
Stager Silver Solids - 30 day unconditional satisfaction guarantee.