In the past I would run a chain or heavy wire from the back side of the speaker box to the wall behind it.. That gave me 3 points of contact.. It was more for aiming the speaker at the sweet spot, and as I have never finalized the seating in my theater room (funding issues !) there has not been a permanent spot to aim at..
They weigh 57 lbs each, so with the laws of inertia in effect, not a lot of movement going on..
They play loud and very very clean.. Yes, you do have to drill pilot holes in the tops of them.. Many of my friends used to freak about that.. I've been doing this to my speakers since 1972, and never had a problem with a speaker falling, or coming apart at the seams, etc..
Again, I have photos, and will "TRY" to post them.. Soon..
