Damping materials

[MT_bassbone]

I am working on a speaker build and the plans call for a combination of two 2mm thick sheets of alubutyl and 3mm hardboard (inner most layer) to be applied to inner walls of the boxes followed by 20mm of foam all over the inside. There is also a blanket of damping behind the tweeter in the upper part of the box. Would there be any measurable difference using the 3-layer foam product available at Parts Express?

https://www.parts-express.com/Sonic...ing-Material-w-PSA-18-x-24-260-535?quantity=1

I am guessing the answer is likely not much. Similar to the Baltic Birch vs MDF argument for cabinet materials. I am using BB for this build.

If there is a huge difference, educate me.

 

[CptKaos]

" If there is a huge difference, educate me."
dampening = making something wet
damping = vibration reduction

 

[MT_bassbone]

" If there is a huge difference, educate me."
dampening = making something wet
damping = vibration reduction

Good point CptKaos. Pardon my Montana public school education. LOL. I updated the post.

 

[a4eaudio]

Or not...

 

[NTK]

We do have a thread on this topic.

A comparison of the effectivity of various speaker damping materials

Have seen a lot of discussion about speaker damping and many applications seemed to be ad-hoc. Admittedly, even the use of damping for Directiva r1 was more of a guess than I was comfortable suggesting. Having acquired many different types of materials from different DIY projects, I felt it was...

www.audiosciencereview.com

 

[a4eaudio]

I am working on a speaker build and the plans call for a combination of two 2mm thick sheets of alubutyl and 3mm hardboard (inner most layer) to be applied to inner walls of the boxes followed by 20mm of foam all over the inside. There is also a blanket of damping behind the tweeter in the upper part of the box. Would there be any measurable difference using the 3-layer foam product available at Parts Express?...
...I am guessing the answer is likely not much. Similar to the Baltic Birch vs MDF argument for cabinet materials. I am using BB for this build.

There is probably very little difference. If it were me, I would use cheap butyl rubber sound deadening material by Amazonbasics and the 30mm Acousta Blue denim damping material from parts express.

Note that the butyl rubber and the hardboard called for in the plans reduce the volume of air in the cabinet, whereas open cell foam and the denim material doesn't. So not having the 3mm hardboard will give you a little more air volume in the cabinet, You can calculate the approximate difference and it is likely only a small % of the cabinet volume, unless it is a very small speaker.

 

[Fledermaus]

But, but, if you omit the [outer shell/butyl/thin hardboard] sandwich, you'll miss the constrained layer damping likely intended in the design - is it a great loss, I don't know.