warmest speaker cables you've heard?

Cardas Golden Cross on used market.

@jasonbourne52 Wire is not a tone control - contrary to what the "golden ears" crowd claims!

Disagree 100%. With moderate hearing, some (not all) interconnect and speaker cabling absolutely CAN function as a passive tone control, grain & edge control, even to the degree it can ruin and collapse a sound stage when using poorly designed cabling. Matching up good cabling can be rewarding in lieu of rotating through various amps or tubes like some people do obsessively. A good cable synergy can be truly rewarding when you hit the target, particularly when 50% or more of the recordings out there are not that great. Or do like some of my colleagues have and finally caved after decades and pick up a preamp with tone controls. Not for me, decent cabling can do the trick too! Home Depot zip cord ain't gonna cut it.

wire/cabling is absolutely a tone control, whether we like it or not

questions are more or less, in what sense, and do we know how to employ the effect to the benefit of the system in how it produces the music

Vast majority of cables get the tone control rap because they are dealing with signal resonance primarily by means of tuning them to sound less bad. Always thought they were getting better by eliminating distortions, and that is part of what they do. But what they are left with, they try and tune to sound the way they want. That is why all the different cable brands tend to have the same sonic signature or House Sound. 

Never even dreamed the extent to which they all do this until I tried Townshend F1. Sorry, they are not warm. They are just... right.

If you want the best SCs available, the Silversmith Fideliums.
Believe a 4’ pair are $795.
I replaced $6K cables that are now junk relatively. Warm, I guess so. But if you want to hear everything the SR1as are capable, 30 day trial. You will not return.