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Old 11th January 2013, 09:02 AM   #1
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Default Damping material for acrylic WG

I'm not sure if this is the right forum for this, but I couldn't find a more appropriate one, so here goes:

I've got some acrylic waveguides for my C12 tweeters, and I'd like to use some kind of damping material on the back side of the waveguide. Any material scientist types that could point me in the right direction, or a forum that might have some expertise in this area? I have some concerns about adhesion to acrylic. And of course I'm thinking of something heavy duty like some kind of clay like substance. Pictures of the waveguide can be found here: Accuton C25-6-012 in a waveguide - Page 2

Thanks in advance for any pointers.

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Old 21st October 2016, 04:33 AM   #2
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Nice waveguides.
Not knowing about the properties of 100% silicone but aware
that it would add mass and most likely have some sort of damping effect(most likely shifting resonances downward, hopefully below passband), I would try using clear silicone caulk.

It could be smoothed onto the rear of the waveguide in whatever thickness with a small putty knife and not have the ugly look of putty or bitumen( both of which can degrade plastics).
I have made formed isolation pucks of 100% clear silicone and it does a very good job in that aspect.
Materials experts please feel free to shoot me down, but its just my experience.
JEREMY M_________________________________
I like it loud, BUT NOT TOO LOUD!.... Hey do you hear that high pitched ringing sound ?

Last edited by Top Shelf; 21st October 2016 at 04:37 AM.
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Old 21st October 2016, 07:19 AM   #3
frangus is offline frangus  Australia
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The waveguide is clear acrylic? I doubt you would gain much by damping it
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Old 22nd October 2016, 04:25 AM   #4
GM is offline GM  United States
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Yeah, even by itself it should be fine for tweeters, so once mounted to a baffle it's going to be very well damped. I would use a u-clamp or similar to further mass load the driver to the baffle though.

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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