BTW, I'm sure I contributed to this discussion saying that I heard hissing through my BL9s connected to the MKIV. Where are those posts?
I also remember that Moxxey. But I think we have run across a few posts on fairly the same subjects.
I spoke to my dealer today, who has replaced a previous dealer now shut down where I bought my BL 9's. Current dealer says: Previous dealer known for using unoriginal cables to save a few bucks, and this is a known issue with those cables.
So... not to fire up the old cable discussion again, but that was what he said. I myself was unaware that I probably have unoriginal cables, but I most certainly will swap them as new dealer meant that was all it took. Can not say of course if you might have some odd fellow connected to your speakers, but I will at least give it a shot to switch.