We had a stinker of a room acoustically and spent a long time into the evening, setting up and trying to make the most of it.
Ran a sweep on the room and it was fine 170Hz up, pretty flat with a gentle roll off at the top. Below 170hz it was peaks and troughs with many phase changes, had a wide and deep dip at 50Hz and a large peak below that. We tried everything we could but Gordon's Linkwitz LX521 OB's just wouldn't work in the room, so he didn't show them in the end.

WTF Is this HiFi , Plug it in set the volume and listen