I have heard the Coppertone cables, they are as everyone is saying...superb cables at very reasonable prices.
There are a couple of rave reviews here: http://fairhedon.com/2019/01/16/black-cat-cable-coppertone-interconnects-and-speaker-cable%EF%BB%BF/
There are a couple of rave reviews here: http://fairhedon.com/2019/01/16/black-cat-cable-coppertone-interconnects-and-speaker-cable%EF%BB%BF/