Edge Coating

[fatmarley]

Did the surrounds on some Beyma 5P200Fe last night. They have a dip around 1000hz and also a peak in the impedance around that point. The peak in the impedance is now reduced to almost flat after adding Anita's Tacky Glue to the surround, but I haven't measured the frequency response yet...

 

[cph2000]

What about this stuff:
Speaker Foam Guard Cone Edge Sealer, Cloth Surrounds, Foam Surrunds, MI-1291FG

Or this:
Tacky Speaker Surround Dampener and Adhesive

 

[hollowboy]

I have treated many, many drivers, using more “doping” than you would use on a surround, surround, measuring them before and after, and unless you really work at it (like 10 coats on a 12” woofer) any T/S parameter changes are less than the factory variation in parameters and the differences that one gets with changes in the weather (mostly air pressure & temperature).

dave

Stuff like this is gold.

Actual measurements that essentially say "dude, don't worry so much".

Imgur: The magic of the Internet

 

[HeadShake]

YouTube

Liquid silicone rubber?

This sounds like an alternative and based on the video is used for the same purpose?

 

[Juhazi]

Remember, that all "treatments" don't make the driver better!

 

[Nissep]

I am unsure if the solvent in plastidip aerosol can is harmful to cone/surround, if it is not then it could have potential as a damping compound. Since it is in aerosol form. https://www.prodip.eu/plasti-dip-safety-data-sheet/PRODIP_PlastiDip_Aerosole_SDS_EN.pdf

 

[oon_the_kid]

Did the surrounds on some Beyma 5P200Fe last night. They have a dip around 1000hz and also a peak in the impedance around that point. The peak in the impedance is now reduced to almost flat after adding Anita's Tacky Glue to the surround, but I haven't measured the frequency response yet...

Hi,

Interested in your results, you managed to do the measurements yet?

Oon

 

[ScottG]

There are hard coat coatings, and flexible soft coat coatings.

Modgepodge is the former, and Aleene's Original Tacky Glue is the latter.


This one has both applied, but the Tacky Glue for the surround/cone edge is the most beneficial:

From Dan:

audio blog: Large Driver Cone Treatement

 

[planet10]

There are hard coat coatings...Modgepodge is the former

It still remains flexible thou.

Things like laquer can get quite hard and stiff.

dave

 

[Boden]

11 pages of discussion and not a single measurement? And now for the real thing:
David Ralph's Speaker Pages - Projects
Or this: SBacoustics + slit cone (poor man's revelator)?

 

[oon_the_kid]

It gets hard but remains flexible.

Does modgepodge treatment work on metal cones as well? I was thinking of applying to my aluminium cone driver with a more coats in the middle, less coats at the side?

Oon

 

[planet10]

I have done exactly that with Al cones that tend to have annoying ring. It works.

the toobs Mk 1

Depending on the driver some experimentation will be needed. On a typical Al cone, the modpodeg is removable (isoproponol and lots of q-tips).

dave

 

[ScottG]

11 pages of discussion and not a single measurement?

..someone didn't look at the link provided just 2 posts above this comment.

Also, if you look through Dan's blog, you'll find other measurements there pertaining to this.

 

[oon_the_kid]

I have done exactly that with Al cones that tend to have annoying ring. It works.

the toobs Mk 1

Depending on the driver some experimentation will be needed. On a typical Al cone, the modpodeg is removable (isoproponol and lots of q-tips).

dave

Hi Dave,

Thanks for the info. Do I have to dilute the Modge podge or could I use it as it is?

How many coats did you typically need to use?


Oon

 

[planet10]

I would dilute it at least a little bit. How much depends on the consistency of the bottle you get. Unlike paper cones you don’t have to worry about warping them if you thin it too much.

Many coats of thinned is better then fewer thick coats.

dave

 

[Boden]

@Scott: indeed a bit to rush. Where in his blog does Dan describe the procedure? I only managed to find the measurements.

 

[ScottG]

..and Aleene's Original Tacky Glue is the latter.

Correction: it's the Flexible Stretchable from Aleene's:

Aleene’s Original Glues - Aleenes Flexible Stretchable Fabric Glue

The Mod Podge was the "Hard Coat" variety.

 

[ScottG]

@Scott: indeed a bit to rush. Where in his blog does Dan describe the procedure? I only managed to find the measurements.

He makes a few comments on application with some of the blogs comments under the graphs, also he comments further when asked in the Q&A of the link I provided.

Altogether it's Aleene's on the surround with a few coatings: presumably a thin coat and then let it dry, repeat that process until you get the desired result. He also mentioned using some yellow glue in the cone-surround transition at one point (same application process). I believe he also tried Aleene's on the whole cone in one of the experiments.

Same basic thing for the Modpodge.. though only on the cone surface (and maybe the dustcap???), but it took much longer between dry-cycles for application.

Totally an experimental thing, and results will depend greatly on the driver. Note that some manufacturer's do the surround coating for some of their drivers (..and they usually cost more than other similar drivers because of the labor: application + dry-time + application + dry-time, etc..).

 

[xrk971]

My W5-2143 has the wet look on the edge of the surround and cone and surround and frame. It is a smooth driver that is not too expensive for how good it is. The tacky wet look rubber collects dust, lint, and sawdust pretty badly . I just discovered that a microfiber cloth moistened with water removes the lint from the wet look pretty good. Be careful not to get the paper cone wet though.

 

[b_force]

Interesting thread,

My first thought was to use liquid rubber or liquid latex.
I have used these to repair rubber surrounds and it stays very flexible.