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Thread: Diaphragm Damping Agents

  1. #31
    Senior Member richluvsound's Avatar
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    how ?

    Giskard ,
    how do you apply aquaplas ? Is it something a rookie could do ?

    Rich

  2. #32
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    Quote Originally Posted by richluvsound View Post
    Is it something a rookie could do ?
    Yes, just like any of this stuff, anyone can do it.
    Last edited by 4313B; 06-02-2007 at 05:31 PM. Reason: Added quote response was intended for as clarity.

  3. #33
    Administrator Robh3606's Avatar
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    With a paint brush. It spreads pretty easily and seems to cover well.

    Rob

  4. #34
    Senior Member richluvsound's Avatar
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    thanks

    Cheers Rob,

    I understand now..... anyone can do it !!!! I suppose its has to come through JBL ? It just so happens I aint too bad with the old paint brush !

    thanks for your kind reply

    Rich

  5. #35
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    Thanks Rob. Here's the one I got.
    Quote Originally Posted by richluvsound
    why are you so unkind. ?
    I guess I should have quoted the specific phrase I was responding to, which I've gone back and fixed.

    I'm the unkind individual that stood in line at the Post Office to send him his horns.

    I was thinking of doing a post on the process I use but it's too much work and I'd rather just get them done, shipped back and drop the subject once and for all. I've only got twenty more to do. My offer to do them all for everyone was a pretty dumb one. The real PITA is having to QC them with CLIO when I'm done with each one.

  6. #36
    Senior Member richluvsound's Avatar
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    My apologies

    Giskard,
    Indeed, that was a kind gesture. If your post office is anything like mine your deserve a silver star. I realise how much you do for people here on the forum. That is why I was asking about the process, not asking anyone , least of all you, to do it for me . I dont want people to do everything for me. I came here to learn to do this stuff for myself, and not from an armchair either.
    I wish I'd done an E.E degree when trying to get my head around some of this stuff but, alas, I chose painting and french de-constructionist philosophy along with all the other hyper-sensitves .

    Rich

  7. #37
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    Quote Originally Posted by richluvsound View Post
    If your post office is anything like mine your deserve a silver star.
    It's overrun.

  8. #38
    Senior Member Ian Mackenzie's Avatar
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    If you Clio them can you send with a certificate..signed JBL bad ass?

    Just kidding. But is the impediance changed from the stock dias in a way that the voltage drives need revision?

  9. #39
    Administrator Robh3606's Avatar
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    Hello Ian

    Here's what happened when I tried coating with sample I have on an a beat up 035ti. There were changes but I don't think they were significant enough to worry about. That said I didn't run them and look for differences in LEAP. The Red and Blue for THD are without. The Green and Orange are with. The first impedance plot is without and last is with. You can see the shift in the resonace peaks. There were not real changes to the impulse and step respones plots. There were changes on the FFT plots as far as harmonic content. There was what appeared to be a reduction in the magnitude of the higher order harmonics. I need to try to confirm this at a latter date. I don't know if it was real or not and if the measurement was valid.

    Giskard could you please post a before and after if you have them. I don't know if the aquaplas sample I have is the same exact material as the real deal you use. I added pigment to mine to make it black. I would love to see if our measurements show the same changes.

    Thanks

    Rob
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  10. #40
    Senior Member Ian Mackenzie's Avatar
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    Gee's Rob,

    look what happened. Did you trowl it on?

  11. #41
    Administrator Robh3606's Avatar
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    Gee's Rob,

    look what happened. Did you trowl it on?
    No I used a shovel and a back hoe.

    Rob
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  12. #42
    Senior Member Hoerninger's Avatar
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    Rob,

    thank you for sharing.
    Do you make waterfall plots as well?
    ___________
    Peter

  13. #43
    Administrator Robh3606's Avatar
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    Hello Peter

    I didn't but I can. I saved the MLS data files. I just went back to see what they look like but don't see that much of a change aside from the slight drop in level.

    Rob
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  14. #44
    Senior Member Hoerninger's Avatar
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    Rob,

    thank you for the pictures. Although I have not seen this kind of colored waterfall before (always sort of 3D in BW) these pictures seem to tell more than the frequency responses.
    Around 3 kHz and 4,5 kHz the waterfall of the damped cone is less red in comparison to the region of ca. 10 kHz. For me it indicates a quicker roll off (and a cleaner sound reproduction).
    [But I am no expert.]
    ___________
    Peter

  15. #45
    Administrator Robh3606's Avatar
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    Hello Peter

    [But I am no expert.]
    Well I am not either. I will take a look at them again. The second file with the Aquaplas is about 1db lower in amplitude. I have to go back and see if this is the cause or not. Easy enough to find out. Differences on the standard plot are difficult to see.

    Rob

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