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In Reply to: RE: Yes, I would say the bar (or several) has become unstuck. ... posted by ketchup on May 07, 2021 at 18:04:41
Yes - and as there were no mechanical fixings that I could see, I assumed Magnepan must've used glue, originally.
Screwing the bars down ... stopped them vibrating. :-))
Andy
Follow Ups:
I have some humps in the response of my 3.6 (80-90 Hz). I have located it to the two buttons on top of the bass driver holding the Mylar to the backplate. These can come lose, it is just a screw. Mine are still not buzzing but I have a PEQ cutting out the resonances right now. I am too lazy stripping them down right now.
The crossbars on the perforated sheet steel are glued and can come lose. My old Tympanis (-76/77) have them glued and screwed.
Interesting, Roger - the 'tuning buttons' on my IIIa and 2.5 bass panels are riveted on ( not screwed).
Andy
This is what they do:
The early Tympanis were just glue no buttons.
Edits: 05/08/21
What is the red goop in the tube ???
The red goop is most likely Loctite for the screws.
couple different kinds of loctite. FOUR, to be exact.
The RED, I think is the 'hardening' type and will be a real Btch to remove.
the purple is a softer type and meant for smaller screw......I'd use THAT one....
Too much is never enough
"... will be a real Btch to remove." The cure being worse than disease?
I'm not a Loctite removal expert, BUT the hardening stuff is tough.......And I think the Loctite literature calls out fasteners above a certain size. NOT 1/4" or whatever, for sure.
The non-hardening is best for this applicaiton IF IT IS Necessary at all....
Too much is never enough
It looks like Loctite 268.
https://www.henkel-adhesives.com/us/en/product/threadlockers/loctite_268.html
panels don't vibrate right out of the frames given the way those picture frame "u" staples fasten them down. But I guess it works!
Did a double take on those fingernails.
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