[JN] damping

Hans Hedal hans.hedal at post.cybercity.dk
Mon Jun 17 10:50:28 CDT 2019

Hans wrote:

> Steven S. wrote:
>> this guy ... talks about contrained layer damping later in the video.
>> https://www.youtube.com/watch?time_continue=2&v=EEh01PX-q9I
> Sony originally had a (now expired) patent on "Constrained layer 
> damped loudspeaker enclosure".
> Quote:
> "The front baffle board comprises an interior substrate, an exterior 
> substrate, and a constrained layer damping material sandwiched between 
> and bonded to the two substrates. The constrained layer damping 
> material comprises an energy absorbing thermoplastic alloy having a 
> very high material loss factor. The other walls of the enclosure also 
> comprise an interior substrate and an exterior substrate with a 
> constrained layer damping material sandwiched therebetween."
> [I believe "TECH INGREDIENTS" have read this patent (or similar) 
> before making the video.]
> The patent text (which could supplement the video) gives a description 
> of the problems, and how they were solved practically:
> https://patents.google.com/patent/US5949033

SONY and TECH INGREDIENTS both suggest making a constrained layer 
damping sandwich yourself.
But if it's possible to get soundproofing plywood with a built in sound 
absorption layer:



Couldn't something like this be used as a quick prefab solution instead?

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