This inert material - non-resonant and non-magnetic - has a dense consistency and angular particle size to prevent pockets of air from forming. Mass loading and dampening a speaker stand is an important and simple initial upgrade to your audio setup. Each bag weighs 3.50 lbs.
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Expensive, but worth itThis is pretty expensive filler, but easier to work with than others, don’t mess with sand or lead, and the likes. The performance stand can hold 3 bags per stand.