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Thread: C38 fiberglass insulation recommendations

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    C38 fiberglass insulation recommendations

    Has anyone found a good substitute insulation for the older JBL speaker cabinets?
    I know Wrap-Go used to sell the now discontinued 1” thick fiberglass wool insulation.

    From what I’ve read, it seems that was a great insulation to use in these cabinets - better than synthetic cotton fill insulation.

    Any help would be greatly appreciated — Thank you!

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    Senior Member BMWCCA's Avatar
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    I've just used pieces of normal yellow fiberglas insulation from the building supply store. Sometimes I have to buy it with the craft paper on one side, and just rip it off. Seems to be exactly what was already in my C35 and C37 from JBL.
    ". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers

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    Quote Originally Posted by BMWCCA View Post
    I've just used pieces of normal yellow fiberglas insulation from the building supply store. Sometimes I have to buy it with the craft paper on one side, and just rip it off. Seems to be exactly what was already in my C35 and C37 from JBL.
    Thank you so much for your response! I’ve been trying to figure this one out for a while. I had read somewhere that the factory original insulation was the wrap-go fiberglass insulation which measure 1” thick with a specific r value. The closest I’ve been able to find had been able to find was a 1.5” fiberglass wool with a lesser d rating.

    Does the fiberglass wool do a better job than the synthetic stuff?

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