Hi
I have mine connected using a cat6 HDMI extender (50 feet) and SPDIF for sound. It works fine. I dont think that composite is ok you, I use that for link, and it does not look good on my 7-55 (if I use BM5 on my link TV, then the main TV does not use the DVI output of BM5).
There is something about B&O.....