whats wrong?

cstmar01
cstmar01 Posts: 4,424
edited March 2010 in Vintage Speakers
with the Passive radiators in this picture? It looks like they are bubbling or something? I've never seen that before on SDA's that I've seen online. Any ideas?

http://cgi.ebay.com/Polk-Audio-SDA-1B-Speaker_W0QQitemZ390172097530QQcmdZViewItemQQptZSpeakers_Subwoofers?hash=item5ad811bbfa
Post edited by cstmar01 on
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited March 2010
    A lot of them do that over time. The passives were covered in a thin foam like material, and over time they can start to separate from the cone, and bubble up like that one.

    As far as I know, there really isn't a fix for it, aside from replacing the PR's.
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    I guess I've never seen any others with this problem and thought it looked strange. thanks for the info.
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  • DaveHo
    DaveHo Posts: 3,536
    edited March 2010
    I've always wondered if they could be peeled off & re-applied with spray adhesive. Anyone try it?
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    good idea. didn't think of that myself, otherwise are PR for these hard to come by?
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  • DaveHo
    DaveHo Posts: 3,536
    edited March 2010
    The bubbles shouldn't affect the sound, but it sure is an eyesore. They pop up every now & then on eBay.

    Just had another idea. What about injecting some glue into the bubble with a glue syringe? You'd work it around while flattening out the bubble & the excess would come back out the small hole used to inject the glue. Too much glue would change the mass of the PR & affect the sound, but I don't think the amount of glue that would remain would affect anything.
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    well seeing this acution ended and no one bid, I sent them a request to see if I could buy them still. however I offered less than the OP which was 300.00 including shipping due to their condition. We'll see if they send me anything back.
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  • inspiredsports
    inspiredsports Posts: 5,501
    edited March 2010
    I have a decent pair of 12" SW120 passives here that work in SDA-1A, SDA-1B, SDA-1C and SDA-1 and I'll see if I can dig up the photos.

    The SW120 has the thin layer of foam that can bubble as in the for sale speakers above, but the SW121 used in the SDA-2B and SDA-2 is identical without the foam layer. I've compared both and the SW120 has a stiffer feel to it. Mine have no evidence of ever having the silver domed weights glued on the back of the white styro-foam. I don't know if that was different from year to year as is so common with many Polk parts.
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    inspiredsports wrote: »
    I have a decent pair of 12" SW120 passives here that work in SDA-1A, SDA-1B, SDA-1C, SDA-1 adn SDA-2 and I'll see if I can dig up the photos.

    sweetness. I really do hope they answer me back and didn't think I was Low balling. But they are beat up and I also asked if any of the woofers are frozen, so I hope they know what that means.
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  • Ricardo
    Ricardo Posts: 10,636
    edited March 2010
    In case he accepts, do you plan to have them shipped? That might not be a very good idea......no matter how cheap you get them.
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  • inspiredsports
    inspiredsports Posts: 5,501
    edited March 2010
    inspiredsports wrote: »
    I have a decent pair of 12" SW120 passives here that work in SDA-1A, SDA-1B, SDA-1C and SDA-1 and I'll see if I can dig up the photos.

    The SW120 has the thin layer of foam that can bubble as in the for sale speakers above, but the SW121 used in the SDA-2B and SDA-2 is identical without the foam layer. I've compared both and the SW120 has a stiffer feel to it. Mine have no evidence of ever having the silver domed weights glued on the back of the white styro-foam. I don't know if that was different from year to year as is so common with many Polk parts.

    I found them: http://www.polkaudio.com/forums/showthread.php?t=82691

    Last, based upon my successful 2008 upgrade of my 1986 SDA SRS 2's, the SDA-1B is more valuable than most think as it can be "TL'd" by simply replacing the 4.4uf cap for the top tweeter with a 5.8uf and then adding an RDO-198.
    VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
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    GIK panels
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    Ricardo wrote: »
    In case he accepts, do you plan to have them shipped? That might not be a very good idea......no matter how cheap you get them.

    Because I would have no other choice I would have to, so I would have to discuss how and whom they would be shipped with. They don't offer local pick up if I can remember from the add so I really wouldn't have a choice.
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited March 2010
    cstmar01 wrote: »
    Because I would have no other choice I would have to, so I would have to discuss how and whom they would be shipped with. They don't offer local pick up if I can remember from the add so I really wouldn't have a choice.

    The ad says, "$100 Flat Rate Shipping." I have no idea how they would be shipped but I would recommend having them crated.
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    thats what I was thinking. I was going to see if they would at least get them professionally packaged for me and crated to be shipped. If it gets to be too much in terms of cost I'll just say forget it. I also haven't heard anything back all day so its probably a no-go but we'll see.
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  • RuSsMaN
    RuSsMaN Posts: 17,986
    edited March 2010
    A local pair will show up for you, just be patient and keep your finger on the trigger.

    Cheers,
    Russ
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  • hearingimpared
    hearingimpared Posts: 21,136
    edited March 2010
    Russ is that bubbling a common problem with PRs? This is actually the first time I've anything like it without water involved.
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  • cstmar01
    cstmar01 Posts: 4,424
    edited March 2010
    RuSsMaN wrote: »
    A local pair will show up for you, just be patient and keep your finger on the trigger.

    Cheers,
    Russ

    Oh I will. I just thought maybe I could get these for a good deal, but then after thinking about it, it may not be such a good deal after all.
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  • jrgoswick
    jrgoswick Posts: 159
    edited March 2010
    If you get these shipped-USE FED EX and have the owner mark them as fragile. From experience, go ahead and get tweeters. My M12's were trashed after shipping(dinged corner, bad tweeters).
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