I would say the Flow cable is very close to what the Hart would sound and look like. They look nearly identical, actually. The flow cable definitely brought a bit of warmth to the sound signature as opposed to the silver-plated OCC cable that I had on there. That cable was a bit too bright for the Sundara, but for some reason was a much better match for the HP-2. The periapt cable also sounded really good on the Sundara, but it sounded too good on the Elegia not to pair them together.
The Kennerton cable was also good on the Sundara, but when very technical passages would play I noticed some loss of detail and clarity. That cable was also single ended, so I am unsure if that had anything to do with it. It should be noted that the 3 cables that were under test last night are balanced.
In the intangibles area, All three wear very well, but the Flow was the one that won in that category. It’s dead quiet and so comfortable to wear you sometimes forget it’s there. The periapt, if anything, felt a bit heavy at times but was the best built cable of the three in my view. The perceived heaviness is certainly not a deal breaker for me, but was something I noticed. At some point I may end up getting another Periapt for the Sundara.
And, final and full disclosure, we are talking about my screwed up ears, here! But this is what I experienced. I hope this helps.