Speaker cable advice

I have Clear Day double shotguns in 2 systems,  if my memory serves me correctly Paul mentioned to me that he thought that the cables were better suited with tube amplification.

I also have a REGA ISIS Valve cdp/DAC. REGA OSIRIS integrated amp and new HARBETH 30.2 XD’s.

With the new HARBETHs, my upgrade path that worked for me just as you asked (warmer, more presence …) was to upgrade from an all NORDOST FREY cables loom to CARDAS CLEAR XLR ICs first.

The CARDAS CLEAR Speaker cables were the next to follow in good form but the largest impact was from the ICs.

The last piece in progress will be CARDAS CLEAR BEYOND power cables (demoed but not bought yet)

FWIW.

Aftermarket cables for headphones is an easy way to test silver vs copper cables. I've done it before and there is a difference.

The difference is slight, but it exists. If you wish to test it on your system..ask a dealer to loan you a cable to try out/swap between what you're already using.

The sound signature of a cable depends on more than just its conductor. 

Aftermarket cables for headphones is an easy way to test silver vs copper cables. I've done it before and there is a difference.

I think you’re a bit out of your depth here.  Silver cables can sound like copper and vice versa — all depends on the overall implementation.  Hearing a difference between a couple headphone cables is not proof of anything.  In any event, overgeneralizing and telling someone to just avoid silver cables is misleading and could cause the OP to ignore some outstanding options, which would be a shame.