Looking for a speaker cable with a relaxed sound.

Depending on your price range (and contradicting the posts above),
Wireworld Platinum Eclipse 7 speaker cables are the most relaxed, least bright cables I've ever heard and they're all silver. 
That model is at least 50% off of original prices, if not greater.

So you’ve all this detail and spent a bunch extracting it. Now you want to dull it back down a little? Try this experiment. Romex 14/2. The white one from Lowes/Depot. Use only the black and white wires.

Depends on your budget...there are some good choices
I would try ’Sorvelis’...their entry setup....talking about relaxed...Schubert sonatas went from relaxed to ultra relaxed on my floor standers by BMC

Did you get those speakers? If so , what were you using before?

Sorry. Just get?