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If you think about it, the driver cone is by far the weakest link in the cabinet enclosure.
I've seen videos talking about Constrained Layer Damping (CLD) for use in speakers to help reduce cabinet resonance, often using a rubber/tar-like adhesive between two layers of plywood/MDF, etc. For example, using Sorbothane or Decidamp between the layers to absorb the motion instead of transfer it.How does that differ from situations like Mass-loading with products like Norez, Lizard Skin, and Dynamat, which also absord vibrations, but without a second rigid body on the opposite side.What about a cabinet that's walls are filled with sand/kitty litter?Are they fairly comparable, or are there situations when one or the other are preferable? Or is it more a choice among the compromises you're willing to make?
I built my 85 lb. speakers using CL and 1"+ walls. It was a lot of work. In hindsight I'd forgo the CL and use more internal bracing instead.
Finally occurred to me that I use CLD everyday: the ceiling/roof of the center section of our house is made up of SIP's (Structural Insulating Panels). The SIP's are simply styrofoam glued between two sheets of OSB (or could be plywood, even foundation grade plywood). Provides great strength, as a structural engineer had to prove it to myself, (our's span 16 feet across the roof) and superior insulation (no gaps due to studs). A whole house could be built of it in which case the house would thermally perform like a plywood refrigerator (super insulated). The styrofoam can be up to whatever thickness is available (12 inches last I knew) and the sheets are available up to 8 feet x 24 feet. Often SIP's are used in conjunction with post and beam framing. The concept was developed in the 30's by the forest service to conserve lumber (since the plywood/OSB is made up of left over/lower quality wood chips). Houses made of SIP's can be erected quickly. Cost is comparable with other methods of well insulated homes. The biggest challenge is careful preplanning and commitment of window/door openings. Another obstacle is running wiring, although "conduits" are cut/melted into the styrofoam at regular intervals but residential electricians unlike snaking wire through them. Several proprietary methods are used for joining the panels together.
I don't know that SIPs would be considered CLD. My rudimentary knowledge of CLD is that the constrained layer would be viscoelastic in nature. I question whether expanded polystyrene exhibits these properties.The whole concept is interesting to me. Enough so that if someone were willing to do the measurements of samples and draw conclusions, I'd be willing to make test samples................................ ..............................Any scientific types willing to jump in with me? I don't have the technical knowledge or apparatus for that portion.
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