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Thread: Rockwool, yes or no

  1. #16
    Senior Member RMC's Avatar
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    Not sure if fixative hairspray would last as long or forever as spray paint though.

    Richard

  2. #17
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    I use wool for speaker projects. You can purchase it in "ropes" or roving, which are simply loose hair that has been wound but not woven into a long slender shape resembling a rope. They are very easily pulled apart to create quite the pile of fill. You want low bulk wool, not high. I purchase mine here:
    http://www.customwoolenmills.com/woo...lation_rovings
    They can advise based on what they have available. They ship to the States. The 5-7 pound bag would fill a normal-ish sized speaker cabinet. I think I've been using about a pound per cubic foot.

    Quite a bit more expensive than fiberglass, but a pleasure to use and highly effective, imo.

  3. #18
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    Oh...one more downside to Rockwool in a speaker...you can only work with it once. Once you get to the second handling, it will start falling apart (which in a speaker would mean it would blow out of the ports).

  4. #19
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    Quote Originally Posted by rusty jefferson View Post
    I use wool for speaker projects.....
    I probably should have said I use wool, as in from sheep, not Rockwool.

  5. #20
    Administrator Mr. Widget's Avatar
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    Madisound sells carded wool... very old school and very good. Not cheap though.


    Widget

  6. #21
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    I used that dense 703 compressed fibreglass in a pair of Augspurger monitors—contrary to what George Augspurger recommended. My (naive) thought was that the more completely the damping material absorbed the back-wave from the TAD drivers (which are crossed over at 800 Hz), the better.

    My mistake. The 703 fibreglass sucks up too much of the sound and deadens the sound of the speakers. With two inches of much lighter Dacron, the speakers sound more dynamic and lively.

    Just my experience.

  7. #22
    Senior Member RMC's Avatar
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    Hi dubkarma,

    If you look at JBL's Enclosure Guide, second page, Insulation section, they mention "If you must use dacron or felt instead of fiberglass, subtract its volume from the box (make the box bigger)."

    So Dacron, specially 2" thick, must reduce the effective box volume quite a bit, which may explain your "sound more dynamic and lively". Maybe LF bump (amplitude) caused by the smaller box than it seems?

    Regards,

    Richard

  8. #23
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    I finally found some of the OC 703 fiberglass. Tracked some down through a local insulation contractor instead of a direct supplier. He had to order it for me, but he does on occasion anyway. Knew exactly why since they have helped a couple local venues with their acoustical panels for live music etc.

    dubkarma, how much of the 703 did you use? This is probably why many of the designs call for only 3 walls to be lined.

  9. #24
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    My advice is to use Mundorf Angel hair. I used this I my JBL DD55000 Everest project I’ve just finished and it’s fantastic.

  10. #25
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    I'd prefer mermaid hair, felted in clear full moon nights, over this !

    Best regards!

  11. #26
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    Quote Originally Posted by Drugolf View Post
    I finally found some of the OC 703 fiberglass. Tracked some down through a local insulation contractor instead of a direct supplier. He had to order it for me, but he does on occasion anyway. Knew exactly why since they have helped a couple local venues with their acoustical panels for live music etc.

    dubkarma, how much of the 703 did you use? This is probably why many of the designs call for only 3 walls to be lined.
    I believe it was 2" thick panels. (Augspurger had recommended 2" of the regular pink fibreglass, but on all interior surfaces except the front baffle.)

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