Looking for a speaker cable with a relaxed sound.

Maybe your room needs a little bit of attention. Do you have a reflection point that needs to be dealt with?

to cure the sizzles... look upstream

as a general rule of thumb ... copper soothes, silver sizzles

Triode Wire Labs 

I’m ready for the haters, but one of my favorite speaker cables that did pretty much everything right and, had a nice slightly warm sound to them is the Cardas Clear Reflection.

Hi Mike

I don't think that a system's sound need to be tweaked with cables. 
Also, to get there will be a long shot in the dark. Chances are low to get it right from the first attempt, if any.

The right way to go, is to use a cable that fits your system.
For that, I need the following data:
Your Amp's DF and the length of the required cables.

The calculated cable, will be a perfect match to your system and sound better than any other.