Aluminium profile as brace?

[Turbowatch2]

The problem with such raw bitumen products is that they emit some of the various, undefined ingredients over time. During this process the material hardenes and gets brittle. Anyone who owns some building with such a material on the roof knows from pinful experience, it does not live forever.

In a vented (!) enclosure this may only add a special smell to your livingroom, but in a closed one it may dissolve the drivers glue or the membrane suspension. Also, when it finaly gets hard, the desired elastic damping is gone. No good idea to go that cheap and dissolve your expensive drivers..

There are some more advanced products that keep their properties, also made for buildings or roofs and also quite cheap. If you like to experiment, Home Depot or OBI are a nice playgrounds.

 

[JanRSmit]

Depends on what one is trying to get across. If it is to make a point then yes selecting a few images is good. If you want to inform about something fairly complicated like the motion of a speaker cabinet then less so. To understand a speaker's mode shape including the motion of the drivers and internal bracing would require perhaps 3 or 4 images. Multiplied by 5 or so interesting modes. Plus their sound radiation patterns. Multiplied by ten or more parametric changes. Covering everything would require a lot of pictures and substantial effort (which I have done for internal reports in the past) or dumping a plot file for each build into a viewer with some notes on what is interesting.



The motivation is minimising my effort and getting a lot of information across efficiently (plus learning how to do stuff in the modern web based world).



Sharing the full results is the current short term objective. Sharing some software would be a longer term objective if interest develops. I opened a GitHub Pages account to create a website but that required opening a github software account first and then storing the website inside it which confused me a bit at first.



That would depend on what is trying to be achieved and why.



Setting aside the question of whether adding mass is a good, bad or unimportant one will usually require some structures to be effectively damped. Effective damping requires a significant damping force which is the product of the displacement and the loss modulus of the damping material. Compared to walls in rooms, computer casings, car doors,... the displacement of speaker cabinet wall is small suggesting it will need a material with a higher loss modulus to be effective. That is, a stiff lossy material rather than a soft lossy material.

I used a stiff lossy material between two layers of HPL. Very effective. The stuff is originally made to be placed in the glasfiber layers of boats bottom under the engine mounts. I Will look it up, manufactured in sweden.

 

[NareshBrd]

Try looking for rubber sheets as well, a variety of hardness, filler materials, and compositions are made.
Natural rubber is nor as durable as synthetic.

Automobile use parts are sold as cut pieces, and quite expensive, unless you know somebody who uses rolls of the material.
But that is more rugged than indoor grade material.

Best use what is easily available, if the sound is good, you may want to make more of the same design.