@emergingsoul
Thanks for the thread...
My Vandy's weigh 175lb each. I seldom move them, but some great sliders may change that.
Also - 3 ton? Is that melodrama or just a mistake?
1 metric ton = 2204 lbs. So, a pair of 520 lb. speakers weighs ~0.471 ton, not 3 ton. Still, I am glad that I am not installing them!