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RE: "Well, I tried mass-loading" ...

and, surprisingly ... it produced worse buzzing of the spkr frame. :-((

Sure - it's against theory ... but that's how it turned out.

The U-frame each side which the drivers are bolted to was initally just made of 13x5mm steel flat - and I found it resonated when I fed a 130Hz signal into the mid/bass drivers. (Pretty peaky - the resonance was induced only between 125 and 135Hz.)

So I had a number of 13x5mm steel flat pieces cut ... and glued them to the U-frames using thin, double-sided foam tape. So this should've been damping the structure - as well as adding mass.

But the result was ... the spkr frame now buzzed from 100 to 140Hz. :-((

So I decided to get some U-frames made from 12x6 aluminium flat. The result is (despite the reduction in mass, using aluminium) ... there is no longer any vibration!

So I'm happy ... but surprised that theory didn't seem to work. :-((

Andy

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