Jon Risch Wall Panels - A Dense Backplane? - Gary Jacobson

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Jon Risch Wall Panels - A Dense Backplane?

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G'Day,
In Jon's original notes and postings he suggested the use of a rockwool or high density fibreglass panel at the rear of the panel.
Jon later suggested the use of extra-thick fibreglass instead of the more expensive and harder-to-get rockwool.
Both of these materials are difficult to handle, and so I've gone down the path of using Polyester batts of slightly higher density.
To the point - to get a dense backplane - I've tried the following:
1. Start with a 1lb/cu.ft. polyester batt.
2. Use weldmesh (10 gauge). You call it 'hog wire' bent in the shape of a set of large 'jaws', like a large clam or sandwich maker.
3. Insert the necessary polyester batts in the 'jaws' and wire them shut at several points to get an even compression. This may require a lot of little pieces of wire to pull the two halves of the jaws together.
The final density can only be estimated, unless you weigh the whole apparatus, and subtract the weight of the wire, then re-calculate the volume. Compress by half - double the density - rough and ready.
Anyway, this is a cheap and very safe (no nasty fibres) way to get that bit of extra density at the rear of the panel and imporve the bass absorption.
The listening tests continue with all-polyester batts in the panels and tube traps. I will post some results on this in the next couple of months all being well.
Regards,
Gary Jacobson

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Topic - Jon Risch Wall Panels - A Dense Backplane? - Gary Jacobson 17:54:54 04/12/00 (0)

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