Sound deadening material inside cabinets

[Sainicrew87]

I have some experience with sound deadening in car audio and how it helps keep the speaker reproducing sounds more accurately by reducing the resonance of the surrounding material the speaker is mounted to. In all my reading related to particle board over time it tends to expand from moisture cycles throughout the years thus making it resonate more. Would adding sound deadening to the baffle be beneficial in returning this resonance back toward baseline?

i have some leftover sound deadening material from when i did my car doors and trunk silver metallic face with black tarry rubber layer, would it be a good idea to use that? A few patches around the woofer and midranges possibly the tweeters in a klh model 5?

[Aadams]

20 hours ago, Sainicrew87 said:

In all my reading related to particle board over time it tends to expand from moisture cycles throughout the years thus making it resonate more.

Can you show images of how the baffle has been expanded from moisture cycles?

Aadams

[Sainicrew87]

Im not sure if its a very visually appreciable thing more so just theoretical thoughts from my woodworking days. I guess the more appreciable factor is seen when you drill into a new particle board vs some these very old speakers and they tend to be softer/easier to drill through/easily chip/break.

[Aadams]

If your KLH5s appear to have always been in a controlled temperate environment and show no evidence of swelling, my opinion is you don't have a problem.  Applying the deadening material you mention could deface the unit with no offsetting benefit. AR 12 inch are similar construction and very numerous, for example, and the issue you address has never been a concern that I can recall.  Others may a different opinion.