Ref My post below. Darn spell check, I meant to say there is an impedance mismatch.
I had the cables for several weeks before returning them. I used the cables quite a bit, probably put several hundred hours on them, they never got better. At that time, I did have to pay for shipping (both directions) and the refund took several weeks to obtain. I think that has been improved now by the seller.
So, as long as you can try them and return them if they don’t work with your equipment then go for it. Again, there are many positive reviews.
ozzy