The Pinnacle OC HT 1 in-ceiling speaker ($349 for one, $999 for a three-pack) uses a slot locking mounting system that attaches to a ring you screw into the ceiling. Also shown was the QP 2, a speaker designed for use with projection screens, an unusual design with neodymium magnets mounted on the outside ($999/each, black or white). Why we didn't photograph that will always be a mystery to us.