Question on JBL 250ti Speakers

[bmg1956@earthli]

I'm the original owner of a pair of JBL 250's purchased about 25 years ago and upgraded to the ti version when the kit was released. I just removed one of the woofers to have the foam surround replaced and was curious if there is, these many years later, a better material than the classic yellow (fiberglass?) dampening material that the lines the interior of the cabinet? TIA to all for any help or direction.

 

[jcPanny]

Dampening material

Build quality, bracing and dampening material all effect cabinet resonance. Do a quick nuckle test on the JBLs and listen for a hallow, echo sound.
If you still want to upgrade, something like No-res foam would be an improvement over the fibergas.

http://www.gr-research.com/components/no_rez.shtm