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Acoustastuff vs. Fibreglass .....

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  • Acoustastuff vs. Fibreglass .....

    For ~ 1/2 cu. ft. sealed ? Thoughts ?

  • #2
    Fiberglass and Acouta Stuf do the same type of thing but require different densities to create the same result. In TL work Fiberglass density needs to be about 70% of that of Acousta Stuf for the same effects (per George Asperger's work years ago).
    Paul

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    • #3
      So for a sealed cabinet ......
      The end result ( Fc, Qt ) would be equal with either .
      I.E.... If stuffed until Qt ~ 0.7 then Fc would be the same with either ?

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      • #4
        I like the sound of lower Q sealed speakers. It's simple to make the box larger, unless you just want smaller boxes. There are trade-offs, but I find the larger boxes have advantages. The f3 may be higher, but the deeper bass is stronger.

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        • #5
          I have the boxes and drivers .....
          I am using the classic 0.707 Qt
          ( since my driver / box combo is apropos )
          Want ideas for optimum stuffing material .

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          • #6
            I like fiberglass for it's well documented adsorption characteristics. In sealed cabinets the small airborne fibers are not issue. I like acoustastuff in ported cabinets and part of layered stuffing.
            John H

            Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

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            • #7
              Yea .... The fibers are no problem .... Don't even make me itch ( Knock on wood )
              Acoustistuff does seem more available in practicle amounts .

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              • #8
                Type 700 rigid board fiberglass is one of the best damping materials. For instance:

                Absorption Coefficient measured against solid wall

                Hz ________125_ 250_ 500_ 1000_ 2000_ 4000

                1” Type 700_ .17_ .33__ .64__ .83__ .90___ .92

                1” Foam___ .07_ .12__ .28___.60__ .93___ .83


                The fiberglass used for wall insulation should be avoided.
                www.billfitzmaurice.com
                www.billfitzmaurice.info/forum

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                • #9
                  Suspended ceiling fiberglass panels are a good source of rigid fiberglass. The white finished surface peels off easily, you don't have to buy a large qty. I've scrounged beat up open box panels at Menard's for cheap.

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                  • #10
                    I also use ceiling tiles to line the interior of the box. Easy to work with, affordable and minimal itching.

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                    • #11
                      Originally posted by djg View Post
                      Suspended ceiling fiberglass panels are a good source of rigid fiberglass.
                      A source of thicker pieces is commercial construction sites.It's the preferred insulation material for commercial buildings, and you can usually get scraps they've tossed for free, plenty to fill a speaker or two. HVAC supply stores sell thicker sheets too, usually but not always aluminum foil faced.

                      www.billfitzmaurice.com
                      www.billfitzmaurice.info/forum

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                      • #12
                        ATS Acoustics has it too:

                        https://www.atsacoustics.com/cat--Fi...ards--106.html

                        I used the recycled cotton sheets to fill my sealed subwoofer cabs.
                        Francis

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