tomd51 said:
So Chris, not to hijack panicphan6's thread, but would you suggest damping materials with any speaker you see that currently doesn't have much of this or only if you found it lacking or exhibiting behavior you didn't particularly care for?
The only reason I ask is I noticed looking at my Boston Acoustic VR3s via the rear port that there doesn't seem to be much damping material/insulation, but I do like how they sound for pretty much everything. I'd considered putting some damping material in earlier, but was concerned about negatively affecting the sound.
What do you think? -TD
Most speakers will benefit from the modifications. Especially lower cost speakers as being discussed here. The exceptions to this are few, and usually limited to very expensive speakers. If I was to speculate, I think that some speaker companies(such as Infinity) purposely leave a degree of resonance audibility as a way to entice you to the higher end speakers that they offer.
I recommend adding a mass damping material to the wall internal surfaces to prevent a slow energy decay(ringing) and using a very effective acoustic damping material internally to prevent resonances/reflections related to the internal volume dimension(s).
For the mass loaded damping, you can use Peel N' Seal available from Lowe's Home Improvement for about $14 for 25 feet x 6". However, the material is rather thin, and you will need multiple layers. The layers should be built up to at least equal total thickness of 1/3 the wall thickness, for optimum performance/damping. For the acoustic damping material, use a premium grade acoustic foam such as Auralex, in 2-3" thicknesses in the entire internal surface(s), or alternatively use 6-8 lb./ft^3 density fiberglass or mineral wool. However, these last materials are usually only available at industrial/commercial insulation dealers, and only in large bundles. I will gladly sell the mineral wool material to anyone who needs it for cost(it's around $0.35/ft^2) plus shipping. The material will be cut down to smaller sizes than the original 2'x4' size boards, though, in order to make shipping practical.
-Chris