nope, mdf has no damping properties, another urban myth. The property that describes the damping property of a material is the damping factor, Greek letter eta (n
). I have measured n
for lots of materials. Anything above 0.07 is said to be damping, anything above 0.1 is a good damper. Here are the results of some of the materials I have measured:
Russian 7 ply 0.040
just for the record (sorry
) here is a scan of an mdf panel, struck percussively, measured with an accelerometer, upper trace z axis (out of the panel) and x axis (along the panel)
© Cat's Squirrel 2010
The axis along the top is in seconds, you can see mdf rings for over half a second, when struck.
The reason that mdf is used as a platter material is that it is slightly better than rigid metal (Al, n
= 0.0043) and the reason it is used for loudspeakers cabinets is because it is very cheap and can be machined, not for its sonic qualities, which we all have to suffer.