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Acousta-Stuf Polyfill Speaker Cabinet Sound Damping Material 1 lb. Bag
I am trying to design a transmission line enclosure. How much is the speed of sound slowed by this filling. Does the percentage change with frequencies.
The speed of sound is not slowed, rather the stuffing absorbs the back wave. This is frequency dependent, and the longer the wave (lower the frequency) the more material is required. Generally TL's are stuffed from the rear of the driver to the terminus, the amount or density of this stuffing is determined by the end user.
Date published: 2014-12-11
If I have a sealed cabinet that is .53ft^3 how much of this should I use?
We recommend starting with a half pound per cubic foot of volume, this means you should start with about 1/4 of the bag. You can then add or remove stuffing to get the sound you want.
Date published: 2014-03-17
Hello How much Acousta stuff polyfill material do i need to fill two chambers of 2,5 cf volume each?
There is no right or wrong answer for this. We usually recommend about a half pound per cubic foot of airspace but you can adjust to suit to personal taste.
Date published: 2014-01-20
what kind of cabinet is this for?
I'm building a pair of ported bookshelf speakers, is this suitable for dampening them (each cabinet is roughtly 2 ft^3)? how does this compare to regular acoustic foam?Thanks
I generally recommend stuffing a sealed cabinet and lining a ported cabinet. Both products work to achieve the same result but in two different ways. I usually use standard fiberglass insulation or Sonic Barrier sheets for ported cabs.
Date published: 2014-12-11
When using Polyfill, is the volume of material or the weight (density) of the
material more important? If you use 1lb per cuft and the fill settles, do you need additional fill? Which dampens more - the volume or the mass.
It doesn't settle. Most of the time it is sticking out of the box and you have to mush it in to fit the driver. I weigh it out on a digital scale in a plastic salad bowl. I take little clumps and pull and pull to get a uniform density. The pile ends up being huge and if you mush it then it will pop right back. I suppose you could say the weight is a suggestion. One pound will give you a certain volume no matter how much you fluff it out. My old boss used to stuff it in pantyhose, tie off the leg, and throw it in. Personally, I like to stretch it for all it's worth and lay out many thin uniform layers to cover all internal spots of the box.
Date published: 2013-07-06
What's to keep the fluf out of the back of the speaker?
Nothing. The whole bag of this stuff is pretty much one big clump. You have to rip off chunks and pull and pull to strech it out to a uniform layer. It's not like little hairs will be flying around. Most sealed boxes that I've weighed it out for end up being pretty full. The sub kind of pushes it down in the box. I've never noticed it inside the frame of the sub when taking it out. My old boss used to put it in nylons and tie it off then throw it in the box.
Date published: 2013-04-25