I think I'd make a frame out of 2x4's (same dimensions as the base of your speakers) and attach the castors to them. I'd put marble on the top and stick the whole thing under the speakers. If I wasn't so lazy ...err busy; I'd do a diagram for you. A small wooden pull on the front of the frame would let you easily move the speakers.



Getting to 2,000 posts; one year at a time vp160/qs8/qs4/SVS 2000/m60/Monolith 3x200 amp