Looking for a speaker cable with a relaxed sound.

Start with Belden 8477...it is very cheap, and is extremely hi res, and if it suits your system, other cables may not even come close.

I agree that it's always good to start with something like Belden 10 gauge from Bluejeans and you may luck out.  It's great with some setups.  But if it isn't, I would consider looking into Purist.  IMO, they do a great job with speakers that lean towards the forward side, but definitely without loss of resolution.  

I can’t recommend this gentleman enough! Great quality cables and craftsmanship.https://www.schmittcustomaudiocables.com

Jump on Furutech ASAP!!!

As they say.  Junk in equals junk out.