A few years ago voxphoto thought, "I'll just make a mold, and cast a heavy concrete tripod, then screw the speakers to that." He made the mold out of melamine-covered particle board. He then poured the sackcrete concrete into the mold, waited for them to harden, and then cracked the mold off. The finished stands are roughly 80 lbs. each, so its unlikely his speakers are going anywhere fast.