PDA

View Full Version : What is Aquaplas



tweeter
09-15-2009, 02:20 AM
What is aquaplas and what are the benefits?
Why are woofers aquaplased in the front or the rear?

Thanks.

yggdrasil
09-15-2009, 04:18 AM
http://audioheritage.org/vbulletin/showthread.php?t=14236

lgvenable
11-03-2009, 08:40 PM
From the top of my head, without searching for any old posts I participated in....which is where all answers lay.

Aquaplas is an acoustic treatment for JBL speaker cones. I guess I see it's main function in improving the tonal qualities of the cone; while damping resonance. While others will speak to the acoustic function more authoritatively; I can speak to the composition > since part of my career as an industrial chemist was spent designing pigments and applied coatings of one type or another.

Aquaplas is made essentially with silica and clay; more than likely with some type of bulking agent. It may also contain a set of secondary pigments to aid in the bulking structure. No doubt the clay(s) used might be to give both structure and rheological characteristics, allowing the proper viscosity for the fluid to allow spray application.

It would also have a binder (of which I never tried to analyze), some surfactants in it for wetting; and to maintain suspension of the clays/minerals; as well as an anti-settling agent.

It is available as a thickened paste. (What I always referred to as "bag bottom paste viscosity" > since it is trowel-able. I got the sample from Blanchford Chemical (sp?). However, the materials available to the user are very thick. I'm sure JBL's version is covered under an NDA, and hence is not available; unless you took the thickened suspension and cut it to get the correct rheological characteristics to spray.

Too bad in doing that you mess up the pigment volume concentration and the way it consolidates. Then again, JBL and their supplier already knew that.:D

Larry

Mr. Widget
11-04-2009, 08:24 AM
What is aquaplas and what are the benefits?http://www.blachford.ca/products/index2.html

It is used to dampen resonances as well as to add mass to woofer cones. For compression driver diaphragms it is sprayed on very lightly to reduce the inherent resonances.



Why are woofers aquaplased in the front or the rear?I think it is a matter of aesthetics. The aquaplas coating has been applied on the front and colored white or gray for various JBLs and even tinted green for the drivers they sold to Heathkit.

Typically these days they put it on the back of the cone to conceal it. For some cones it is only applied to the outer portion of the cone near the surround.


Widget

ROSSO
11-04-2009, 07:07 PM
... (http://www.blachford.ca/products/index2.html)and even tinted green for the drivers they sold to Heathkit...Widget I would concur with everything except the Heathkit tint part - I have two pair of Heathkit LE-14A's and those babys are spray painted green over the Aquaplas - cone, frame - everthing but the Lans-a-loy surround.

Mr. Widget
11-04-2009, 10:16 PM
I would concur with everything except the Heathkit tint part - I have two pair of Heathkit LE-14A's and those babys are spray painted green over the Aquaplas - cone, frame - everthing but the Lans-a-loy surround.I see that they did paint the frames green, but I'd be surprised if they painted the cones after they were aquaplased. I bet they used tinted aquaplas since painting them would add a step in the manufacturing process. They certainly didn't paint the finished woofers... the dustcaps are the normal black color. Here are eBay picks of LE14As and 123As


Widget