Lamb's wool is very good for the acoustic stuffing. Kimber recommended it to me as better than poly or fiberglass, etc. I have a source in Ohio for a good price, but I don't have the info. with me (it's at home - I'm "working" he-he). But I can let you know - if interested, email me: bobb@spacecom.com. I believe your theory regarding enhanced enclosure-loading is correct. Shawn Casey (no longer at Kimber) told me to stuff pretty firmly BEHIND the cone; fill up the enclosure, but not cram it in there. Then listen, compared to the empty box. Stuff some more, or some less, & re-try it. You tune it by ear.
Damping material for infinite baffle?
I'm restoring a pair loudspeakers that use a sealed box for the bass driver, and an open baffle for the mid and trebble drivers. I've already changed all the drivers (with factory parts) and repaired the crossovers. But now I'm stuck. What is the theory behind using damping material inside the sealed box? Should it be placed against the inside of the speaker walls to try and absorb the rear wave? Of should it "fill" the cabinet? It is my understanding that the former is the way to do it, the idea being to "fool" the speaker into behaving like it is in a larger box than it actually is. And how much should you use? And what material and thickness works best? (I think that the design calls for fiberglass batting R-19)....I am planing to present these speakers to the designer as a gift, so I don't want to consult with him about the correct way to do it! Too bad I have no idea what I'm doing! Help!.....Robert.