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General speaker questions for audio and home theater.

RE: Mechanical buzz in JBL D123-question for speaker repair gurus

I tried holding the surround at virtually all points from underneath and above, but nothing changed the buzz. I also tried what I thought was a novel idea of using masking tape applied to the cone to pull on it in various ways while listening for a change in the buzz. Nothing changed it. Visually, everything looks dead mint, and no rub is remotely detectable. I also made a slim tool out of wire to press on the internal grill in case it was buzzing, to no avail.

With respect to removing the dustcap, I watched a youtube video of a tech sliding an exacto knife around the cap. Here's my question. Is there a flange or lip to these dust caps, or are they literally a section of a sphere with a sharp edge?

And I'm sure I'll catch heck for not disclosing the whole story, but I actually have two D123's, and they both exhibit the same buzz. Now I'm sure the first thing everyone will think is that it has to be something other than the speakers, and that's part of the reason why I didn't complicate things by mentioning it at the outset, but the speakers buzz with multiple amps and multiple guitars, and my other speakers, of which I have many, do not buzz with those same amps and guitars.

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  Kimber Kable  

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