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Thread: First Time JBL 128H Refoaming Help

  1. #16
    Senior Member RMC's Avatar
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    Here are the pics referred to in post 15. Sorry for the delay.

    Richard

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  2. #17
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    deteriorated foam 'goo' is not indicative of "scratchy" sound, but rather frozen/stiff cone movement which is silent. I would suggest there's an issue with geometry somehow. just sayin.

  3. #18
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    Earl's post # 12 raises an interesting question here.

    RE "To the best of my knowledge all JBL woofers with ceramic magnets, having a single back vent, sport this internal foam filter. If one looks through the back vent ( looking past the foilcal screen if present ) and doesn't see the internal filter, one should still assume bits of it are present ( until proven otherwise )."

    I took JBL's word as God's word so to speak regarding their own products on screen vs foam on/in back vent. But nevertheless suggested to OP in post # 11 to check under the screen to see if there's foam, just in case. The potential problem with "until proven otherwise" is that one MAY be cutting the dustcap legitimately (foam present) or not (no foam)?

    Earl's post also raises a concern for me with the 2205H having ceramic magnet. Not a blame nor his fault. I knew for the 2214H and corrected the foam issue. Simply wish the matter of screen/foam would be one OR the other as mentioned by JBL in the pic below, instead of one AND/OR the other Earl appears to refer to. The 2205H do have a foil cal and a screen, peace of mind I thought, up to this point with the above mention which may imply they could also have foam cancer. Better learning it "late" than never, however I don't have time these days to check "on site". Later will try. Regards,

    Richard

    P.S. The pic below is JBL data shown on a JBL related Web site here, so I assume copyright issues (if any, none indicated) aren't applicable in this context.

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  4. #19
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    Richard,

    Nice pic!

    I'd need to check but I think the ( noted ) screen was dedicated to JBL's M.I. drivers ( after around 1980 and the intro of ferrite magnets ).

    Previous to that time period all the alnico type drivers ( Home, Pro + M.I. ) used a plastic-like mesh screen over the internal vent ( "blow-hole" ).



    PS; Here's a shot of my adhoc vacuum attachment used for foam bit removal inside the dust-cap area ( one can see that suction can be adjusted by a fingering the open area where the two portion of attachments meet.



    From this thread over at AK

  5. #20
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    Hi Earl,

    Thanks for the input.

    I don't dispute your previous statement that ferrite magnet drivers may also have foam inside in addition to screen, since I don't really know, never opened the rear nor dustcap, all original. The point is simply it pisses me off that I might have to do another tedious foam rot removal job... Maybe I felt overly safe, secured or comfortable about it in view of JBL pic I posted here. Could be that cruel reality may catch-up with me.

    RE "I'd need to check but I think the ( noted ) screen was dedicated to JBL's M.I. drivers ( after around 1980 and the intro of ferrite magnets )."

    I'm a bit confused now with that statement since my 2205H are not M.I. driver but from sound reinforcement 2200 series and I purchased them new Aug 6, 1980 just checked invoice (been with me 6 years longer than wife! LOL). So mine not MI, have ferrite and 1980 but have a screen.

    Your adhoc vacuum attachment is pretty clever. Another proof that necessity is the mother of all inventions.

    If you want to try the large straw attachement extention to suck up foam rot let me know, I can send you a free long blue or black straw, as you wish, in the mail, they're easy to cut to proper length, modify the end of it or even make two of them. I kept various plastic ones (see pics).

    Probably would be shorter than what you use now. Just tape straw in corner of original vacuum attachment, like your computer attachment, and you keep the fingering adjustment for suction force. Plastic straws are out, not eco friendly, people throw them left and right polluting, getting banned everywhere now.

    Regards,

    Richard

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