Very interesting, I was looking at them from a safety standpoint not cabinet movement from the drivers.
When I built my huge entertainment center years ago I made custom brackets that secured it to the wall so it would not tip over if we had a lil earthquake. I was worried about it being top heavy.
I remember just getting home from College when we had the last big one here in the bay area when the A's & Giants were in the world series and the minute I walked in the door the ground started shaking. The first thing our roommate went for was the TV that was about to tip over, so ever since then I'm a little cautious in that regard with big heavy items. And of course here in CA, all our water heaters are strapped for earthquakes.......
I never thought though that I might be creating my own mini earthquake with the bass cannon's lol
I was thinking more along the lines of just a flexible cable attached to the wall I build to keep them from toppling over if we get a lil tremor. I do not want them to damage my screen. I never thought with all that weight that they would move around, I just don't see enough in front of the speakers to cause enough backpressure to drive the speakers backwards but we will see once I fire those cannon's. One thing for certain, they will have straps for safety.