have the cable (20m) at M-Market KSTL to my loud speaker. get this - and it convinced me fully!
Laying went very easily, because the cable is very thin indeed. The sound quality is 1a, as there is nothing to criticize. The label (red + black) is consistently present with me.
And at M-Market are just 20m 22m)
Conclusion: class cable, Amazon price is OK and great quality!