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Geoffkait: Along same lines I built 2 subwoofers using 4' long cement drain pipes, mounted 8" driver in flared bottom end with sealed top. Mounted the drain pipes on cones with downward firing woofer. Super tight!
geoffkait really brilliant! has to blow away a paper tube?
How thick was the wall?
Very thick. Each drain pipe weighed 160 lb.
I'm still looking for pic's it was a few years ago and I sold the stands with the Sonus Faber speakers I built them for.
The wall thickness of the clay liners is about 3/4" over all the stand is very dead when taped ( or hit with a hammer lol) and very heavy as the volume of sand and the clay liners are not light either.
For smaller speakers, Try using some water cooler stands (designed to hold the smaller porcelain water jugs). Cost is around $80 pr. and they work really well. When I had Synthesis two-ways (Conrad-Johnson), I put their steel tubed stands inside some 10 inch PVC sewer pipe and plugged the ends with wooden disks. Filled with bags of lead shot (kept in the bag) and filled the rest with sand. Sounded good to me...