Oustanding range of veneers available

[tcpip]

BTW, I'm hoping to meet you at Delhi.

Indeed I am, sir. Day after tomorrow.

 

[Thad E Ginathom]

Re: 4mm veneer is fine for speaker building

Our western friends get rolls of paper-thin veneer...

And then they have to get the skill to use it. It is not as easy as people might think. A London colleague of mine used to do marquetry as a hobby. He used to collect veneer whenever he found a good source and had some lovely results, but he had to persevere beyond early nasty-mess attempts. Of course, speakers do not require intricate patterns (but it's an idea!) but still, getting that veneer done properly is still going to be a challenge.

Of course, some of our members are amazingly skilled, and will easily be up to that challenge.

 

[keith_correa]

<snip>it also, as a side benefit, help promote constrained layer damping by virtue of the layer of glue to join the two layers.<snip>

Not really. If this were to be termed CLD then plywood, by virtue of the above statement would already conform. But it does not.

 

[tcpip]

Not really. If this were to be termed CLD then plywood, by virtue of the above statement would already conform. But it does not.

Actually, a layer of ply on top of a layer of MDF will give some of the benefits of CLD. Adding layers of similar material just gives you a composite, not CLD. For constrained layers to work, the constraints come from dissimilarity between the layers. Therefore, plywood does not give you CLD benefits because all its layers are similar.

Of course, how much constraining a 4mm layer of plywood can give you is a separate matter, but in theory, it would give you some, small, amount of damping.

(OT alert)
One of the constrained-layer composites I've been eyeing for some time is a mixture of 25mm MDF stuck with Araldite to, say, 12mm glass. I have a feeling that for enclosure side-walls, this may be a fantastic combination to give me dead, non-resonant walls. There will need to be internal bracing of course, tightly fit between opposing side-walls to ensure a further constraining.
(END OT)

 

[keith_correa]

About CLD, I quote:

whereby a vibrating panel is constrained by a second panel of sufficiently high mechanical impedance. In this mode, the two panels, one vibrating, the other constraining, are joined by an adhesive viscoelastic damping layer. Energy is dissipated through tensional forces of sheer deformation. Intuitively, it might appear the thicker the adhesive damping layer, the more damping. In practice, however, the opposite holds true: the thinner the layer, the more effective constrained layer damping (CLD).