[txrx232+AudCir]

I'm curious about using the spray-on material used in truck beds sprayed on the internal surfaces of speaker cabinets to reduce resonances. Does anyone have expeience with this or a similar technique?

[Danny Richie]

That material does almost nothing for resonance control.

[jtwrace]

I'm curious about using the spray-on material used in truck beds sprayed on the internal surfaces of speaker cabinets to reduce resonances. Does anyone have expeience with this or a similar technique?

If you're set on a diy method, this does work well when properly applied. 


https://www.acrytech.com/product/acoust-x-sound-damping-coating-1-gallon/

[Danny Richie]

If you're set on a diy method, this does work well when properly applied. 


https://www.acrytech.com/product/acoust-x-sound-damping-coating-1-gallon/

We stock and sell that product. It is a nice durable and easy to apply coating for the outside of a speaker. However, it does little to nothing for resonance control.

[jtwrace]

We stock and sell that product. It is a nice durable and easy to apply coating for the outside of a speaker. However, it does little to nothing for resonance control.

That's interesting, I've never heard you mention Acoust-X Sound Damping Coating which is specifically for the inside, I've only seen you mention DuraTex which this clearly isn't. 

[Norman Tracy]

jtwrace,

What is your personal experience upon which you base "this (Acoust-X Sound Damping Coating) does work well when properly applied"? Does it cure hard like a bed liner or softer so it can provide some limp mass damping effect?

Visiting the link I find no real details or measurements. Disappointing, for a manufacturer it is not that expensive to run tests with accelerometer data. There is one review that is for a PA speaker application. They do reiterate applying in a thick coat and then a second coat "if needed". Reading between the lines with my engineer's skeptic hat on if evaluating it I would expect to apply two thick coats to obtain some effect.

If Acoust-X Sound Damping Coating cures hard my experience is that is producing a simple mass loading effect and such avenues yield disappointing results in the context of high-end HiFi speakers. Its the compliance + mass in products like GR's No Rez and 3M's Damping Foil 2552 that achieve wider range panel damping.

[Danny Richie]

That's interesting, I've never heard you mention Acoust-X Sound Damping Coating which is specifically for the inside, I've only seen you mention DuraTex which this clearly isn't. 

Ah, I thought they linked to Duratex (from the same company).

Order some of it and find out if it works or not.

[FullRangeMan]

My unsolicited opinion is that over the years working on pro-audio and car speakers and on my home audio speakers, is that there is no One Size Fits All solution to Cabinet Resonance control.

Why the internal cabinet stuffing will shape directly the output sound the loudspeaker will emit, which is a personal taste according the preferences of each audiophile.

The best solution I found is to test and listen various types of internal stuffing.
As always IMO.

My personal preference is the cheap brown Car Hood blanket 15mm or 20mm(10mm dont works) in some areas of the enclosure - as behind the woofer- etc