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Thread: Best accustic insulation?

  1. #1
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    Best accustic insulation?

    OK, so I finishing up a pair of 15 inch 3/ways that I had a cabnet-maker construct.

    What is the best insulation to use on the inside of the box?


    Should I just use plain pink home insulation or is there something better?

    By-the-way, exactly what does this stuff do; prevent the box from vibrating or is there some other purpose?

    Thx...

  2. #2
    Senior Member Rusnzha's Avatar
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    http://www.partsexpress.com/pe/showd...ewRand=5792917

    I've had good luck with acoustastuff from Parts Express. You need about a pound/2 cubic feet. It tightens up the bass giving it more impact while reducing boominess. If you put some in your midrange compartment, this can have a similar effect on the low end. The stuff has the same effect as adding volume or using a bigger box.

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    It looks like this stuff is packed into the open cavity of the box rather than just placed along the walls of the box; right?

    Wow; my boxes are 7 cubic feet each - so that would take two bags of this stuff at $35 each.

    Is this worth it for large boxes or just for smaller bookshelf-type systems?



    Thx...

  4. #4
    Senior Member sourceoneaudio's Avatar
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    I use Dacron (pillow stuffing) or Jute. Jute is the underlying material used under carpet in the automotive industry.

    Using both of these and not fiber glass keeps the glass particles of out the air you breath. (in ported applications)
    Jeff-S1A

  5. #5
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    Insulation - boo!

    Yeh, I hate the idea of breathing pink insulation too. The stuff makes me itchy thinking about it. I suppose you could place a screen over the baffle ports; right?

    Where can you buy dacron pillow stuffing; Martha Stuart's place; Sears, Bed Bath Beyond? Is this stuff placed in the box cavity too or just used on the inside walls of the box?

    Thx...

  6. #6
    Senior Member Valentin's Avatar
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    fiber glass semi rigid board 3lb/foot density (48kg/m) or mineral wool
    1 o 2 inch thick

    that's the best cost effectiveness and you can find it all over the world.

    density is very important the normal home insulation does not have the correct density

    visit http://www.bobgolds.com/AbsorptionCoefficients.htm

    you will find different manufacturers and models numbers

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    Senior Member Hoerninger's Avatar
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    Closed box: fill the whole volume.
    Bass reflex: attach to the walls only.

    Lamb's wool by VISATON (Art.No. 5069) might be an alternativ, which I prefer.
    ____________
    Peter

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    Val:

    Ok, I think I saw this hard board insulation at the Depo. It was very dense and was being sold in 8' x 4' pieces for about $20 per sheet. It was pink in color, I beleive.

    Is this the stuff you are recommending?

    Thx..

  9. #9
    Senior Member Valentin's Avatar
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    if its the Owens corning it must be model 703 made of fiber glass not foam it is usually yellow normaly sold in 2 by 4 foot sheets

  10. #10
    Administrator Robh3606's Avatar
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    I use a combination of 3/4 inch fiberglass ceiling tiles and batting. Works for me. Just use a long sleeve shirt and scissors to cut it up. The tiles are about 2'X4' are inexpensive and are easy to cut to size and install.

    Rob

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by robertbartsch View Post
    What is the best insulation to use on the inside of the box?
    I am not a fan pink or yellow house insulation as it is so miserable to work with and it will usually over dampen the box anyway as it is so thick. I have found dacron batting to have limited damping ability... even using a ton of the stuff.

    I like Wrap-On fiberglass batting. It is shed resistant and has excellent acoustic properties.

    http://www.audioheritage.org/vbullet...94&postcount=7


    Widget

  12. #12
    Senior Member Valentin's Avatar
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    Smile

    sorry to disagree

    but the celling tiles plus home insulation don't compare in the amount of absorption done by the 3pcf density fiberglass or mineral wool with the same thickness

    tiles work for you ok they do absorb

    but it is not the best solution when absorption is too be taken into account

    Robert i am sure you could find this type of material near you

  13. #13
    Senior Member Valentin's Avatar
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    the semi rigid fiberglass board is very easy to work with you only need a cutter

    easier than mineral wool sine fiberglass boards have a resin that makes them stiffer and easier to cut and preserve their dimensions once cut and stay in place in the box

    it cuts with help of a ruler in easy fashion you will find different thickness 1 ,2 ,3 or 4 inch

    normally only 1 inch is used

    there is also a product made by johns mansville cald linacoustic which has a slite neopren covering that makes it resistant to air flow with out sacrifing too much

  14. #14
    Administrator Robh3606's Avatar
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    sorry to disagree

    but the celling tiles plus home insulation don't compare in the amount of absorption done by the 3pcf density fiberglass or mineral wool with the same thickness
    I think it's the same stuff

    http://www.allnoisecontrol.com/produ...es_ANC1010.cfm


    Rob

  15. #15
    Senior Member Valentin's Avatar
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    there are many types of celiling tiles not all af the comply

    in the one posted the NRC are very good indeed for 1 inch and 11/2 inch

    good data it is 6pcf density glass fiber with a backing

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