Atacama Atabites SMD-Z 7HD Inert Filler | USA Hifi
Improve sound quality by just filling speaker stands #DIY33 - YouTube
I recommend this (cast steel abrasive shot) for filling speaker stands. Basically 1mm cast iron spheres. Paid $60 for a 50# bag delivered and used most of it. Denser than sand, rock
Atacama Atabites Filler ad alta densità per Stand - PlayStereo