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RE: An update! ...

After the above post, I tried 2 different scenarios, to reduce audible 'buzzing':
1. glueing additional pieces of steel to the U-frame structure, to a. increase mass and b. provide damping.

2. making a 2nd set of U-frames out of aluminium. Obviously, these were lighter ... but aluminium is less stiff than steel (so has a lower 'Q').

Unfortunately, neither of these efforts was successful - I could still hear buzzing from the metal frames at certain frequencies ... even though I had to turn up the volume from my sig-gen, to achieve this.

So then I decided to try solid frames - same dimensions as the metal U-frames but made from birch ply. See here:






Success at last! :-)) I can still feel the wood supports vibrating - but this does not produce any audible buzzing.

The only problem is ... wifey doesn't like the wood colour - so I have to get the wood supports sprayed red, to match the bases. :-((

Andy

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