A newb here, but my home audio knowledge is... intermediate. I just moved into a new place, and the living room is pre-wired for a 5.1 system out of the ceiling. It's obvious the previous owner installed this, and seemed to do a good job, so I'd like to use as much of it as possible. I know it's a long shot, but I'd even like to use the existing holes in the ceiling. There's pictures below, but some measurements I managed to get are about 1 3/4" square, from the center of the holes. I guess what I really need are ceiling brackets, as I'm confident that I'd be able to put together a fairly moderate system. If not, this site is in my bookmarks. Any help with this would be greatly appreciated.