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I imagine blue tac would actually be quite good, it has a certain viscosity so would be a really good absorber.. sand is better than concrete both in isolating the sound source ( there isnt any thing 100 solid for sound waves to pass through) and the small particles deflect the waves as they move through the sand.
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'70s undergraduate speaker stands? Probably with the occasional scaffolding plank to brace across the speaker pair, damped by loading it with books?
Moserism
MrE
@dicki
20kg concrete blocks with blu tac to hold the speakers in place works well ?