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RE: I'm a little confused

Posted by Jim_E (A) on November 10, 2009 at 09:39:21

In Reply to: I'm a little confused posted by Peter Gunn on November 9, 2009 at 21:28:10:

Peter,
If we could all step back from entrenched positions for a minute and be objective, I believe that we aren't that far apart.

Wood is a really a complex material. In an engineering it would be described as anelastic; in that that it doesn't have the normal stress-strain response characteristics of most materials. Almost all wood species have a Young's moduli in the tangential and radial direction of the growth rings that is less than 10% of the lateral direction. Thus, one unique property of wood is that it will tend to redirect vibration within itself.

MDF as a glued up collection of fibers which behaves as a more traditional material (i.e. elastic)

A frame ("plate") of any material will flex and have vibration modes when excited. The real differences in materials are in the degree of flexure (displacement) and how quickly the vibration dampens out. Both these characteristics are directly responsible for the audible frame responses.

Mass is actually very important. The frame is being driven by a Mylar (or ribbon) displacement forces. The more mass the frame has, the less frame vibration displacement there will be.

The rigidity of the frame affects the frequency of the vibration modes. Most of the high energy signals in music are the bass frequencies. A very rigid frame could achieve it's first bending mode well above the bass frequencies, and thus offer much reduced frame responses.

The Dynamat material is viscoelastic, and provides increased damping in bending. It should be fully beneficial in terms of vibration reduction for bending modes when installed on any material. The benefit would be reduced for very rigid frames that have very little bending displacements.

regards,
Jim

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