Is 4" the interior dimension? Whatever the answer, you're going to be surprised by how much lead shot you'll need. That's why you end up mixing it with sand. To give you an idea, I bought a 25lb bag and it was less volume than a softball. So decide how heavy you want your stands to be, buy that much lead and fill in the difference with sand. Practical hint: do his in an easy to clean environment.
speaker stand filler follow up
Am hoping some mathematician can assist me in figuring out how much filler I need. PMKably recommended midway usa for lead shot, and they have it! Now I need to determine what guage to buy and how much. My spekaer stands are a triagular column - 20 inches high and the triangles are 4 inches on each of the three sides. Any thoughts on how many pounds of shot I will need to fill these up? Thanks for the help.
Scott
Scott