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Thread: What is Aquaplas

  1. #16
    Senior Member edgewound's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Hello rwwear

    Exactly! I certainly don't know. I doubt they do. You need to match the moving mass assuming the rest of the kit is "correct" minus the coating. Even if you did it would be trial and error to figure out an application process that will give you an even coat like the original which was also sprayed on. Here is a picture of a 129H cone kit front and back.

    Hey Edgewound

    Have you ever tried adding mass to an aftermarket kit using a spray on instead of say a mass ring??

    Rob

    Yes. Actually more accurate moving mass than factory cones.


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    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  2. #17
    Administrator Robh3606's Avatar
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    Yes. Actually more accurate moving mass than factory cones.
    Great thanks! How long did it take you to get the spray application correct??

    Rob
    "I could be arguing in my spare time"

  3. #18
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    Acording to the JBL specs the 2245 got a Mms of 185g.
    When I had the aftermarket from speaker exchange,
    the mass of all moving parts was 120g.
    That wont work out to a Mms of 185g.
    The airload on the cone isnt that heavy.
    Coating was also nothing on the cone.
    Instead of aquaplas I put some epoxy on the back of the cone.
    My goal was to get it as rigid it could be.
    Worked out pretty good in terms of rigid but doing some messeruments
    it turned out I added a little to much.
    The Fs was at 21Hz, the Qts at 0.33 and the Mms was 300g when I remember right.
    It is a damn good sounding 18" with a foam surround, not really a JBL 2245 though.

    I'd do it again, taking less epoxy. 50g was to much, maybe half as much and some
    more liquid typ to get a thinner coating.
    Wasnt looking to take that much but the used epoxy was thick,
    I coudn't cover all areas so I ended up taking to much.
    A friend of mine did the calculations, he coated his cones with some metall coating
    out of the car equipment stuff. Don't know how his 2245 worked out or if he finished.

    Call me blashemer, shake your head, I hope the numbers or my fail my help somebody.
    looking for a JBL 2346 horn

  4. #19
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    Quote Originally Posted by rogerjulien View Post
    Acording to the JBL specs the 2245 got a Mms of 185g.
    When I had the aftermarket from speaker exchange,
    the mass of all moving parts was 120g.
    That wont work out to a Mms of 185g.
    The airload on the cone isnt that heavy.
    Coating was also nothing on the cone.
    Instead of aquaplas I put some epoxy on the back of the cone.
    My goal was to get it as rigid it could be.
    Worked out pretty good in terms of rigid but doing some messeruments
    it turned out I added a little to much.
    The Fs was at 21Hz, the Qts at 0.33 and the Mms was 300g when I remember right.
    It is a damn good sounding 18" with a foam surround, not really a JBL 2245 though.

    I'd do it again, taking less epoxy. 50g was to much, maybe half as much and some
    more liquid typ to get a thinner coating.
    Wasnt looking to take that much but the used epoxy was thick,
    I coudn't cover all areas so I ended up taking to much.
    A friend of mine did the calculations, he coated his cones with some metall coating
    out of the car equipment stuff. Don't know how his 2245 worked out or if he finished.

    Call me blashemer, shake your head, I hope the numbers or my fail my help somebody.
    Hi,

    If you look at FaitalPRO spec sheets ( for 18" woofers ) they spec the moving mass ( Mms ) as well as the static mass ( Mmd ).

    Quick subtraction shows that the airload for a typical 18" to be in the 22 - 25 gram range ( for the given Sd ).

    185g - 120g - 25g = 40 grams ( so you really weren't that far off )

    I kinda doubt that the 300g ( Mms ) figure that you derived ( from ?? software ) was actually accurate.

    There's a thread or two around here about Mms inaccuracies being derived from all the Dayton DATS products ( as well as S+L's WT2 ) .


  5. #20
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    Quote Originally Posted by Mr. Widget View Post
    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
    Strange...the LE14a that are in my L99 have the aquaplas on the front of the cones.

  6. #21
    Senior Member edgewound's Avatar
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    Quote Originally Posted by short_circutz2 View Post
    Strange...the LE14a that are in my L99 have the aquaplas on the front of the cones.
    Its actually on both sides.
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  7. #22
    Senior Member edgewound's Avatar
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    Quote Originally Posted by Robh3606 View Post
    Great thanks! How long did it take you to get the spray application correct??

    Rob
    Application took some times to get the viscosity right. Getting the amount right to apply takes practice. It can take a few applications to get it right. My target is within 5% of Engineering Standard. Production variance from the factory seems to be 20%.
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  8. #23
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    I kinda doubt that the 300g ( Mms ) figure that you derived ( from ?? software ) was actually accurate.
    The used software was ARTA.
    Maybe the added mass, 97,6g, was not enough.

    Gonna do some testing later this year.
    looking for a JBL 2346 horn

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