I've never heard of that, but it sounds like a very good idea. I've heard of using lead shot, but that's almost too heavy, and far more expensive than sand or graded stone. My cousin had some small speakers on stands, and I pointed out the tops were open to fill them. He was perplexed, why would you? But I piqued it curiosity and he filled them with dry sand and was amazed at the better bass. In fact, while I had heard of filling stands, I really was not prepared for the difference it made!
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