Hello.
I know this type of thing has been spoken about but I really haven't a clue. I had BL8000s which would have a slight hiss or sshhh noise. Today I upgraded to BL9s and the hiss is so loud that just listening on low volumes the noise is really loud. I'm using genuine B&O cables. Could it be my Beosound 9000 or is something else? People who come over notice immediately.