Poly fill for speakers
Woodlawn Cabinetry. Paul Larrea. Steve H. Post Number: Registered: Feb
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Content:
- Robot or human?
- Dumb question- speakers
- Tame The Boom, Grow Your Cab: The Wonders of Polyfill
- Speaker Polyfill Vs. Foam
- How much polyfill do I need for subwoofer box?
- A cheap source of poly fill?
- 12.24 What is the best "stuff" to fill a speaker cabinet with?
- How Much Poly-Fill Do I Need For A Sealed Subwoofer
- White Polyfill for Speaker
- Polyfil inside foam baffles for door speakers?
Robot or human?
Forgot your password? Have you ever completed an enclosure that was a touch too small? Your low end sounds cramped but you don't want to or can't build a brand new enclosure. You throw in some polyfill and are blown away by the improvements. Then you go online to talk about it and everything gets confusing. You don't know why it works or what it really did, but you know that it sounds better. Maybe it's time you learned more about it!
Firstly, there are a few primary types of fill that are used. This includes polyester fiberfill, fiberglass insulation, and long-fiber wool. Of these three, polyester fiberfill is perhaps the best option, and also the origination of the term "polyfill".
It is also very easy to apply to the inside of your enclosure: simply staple or glue it to the inside of your enclosure. How does it work? Stuffing a box with polyfill makes it seem larger and it all relates to thermodynamics. When polyfill is added to an enclosure, it changes the behaviour of the airspring in the enclosure from "adiabatic" to "isothermal".
The term "adiabatic" implies that there is no heat transfer occurring. An isothermal process occurs once the polyfill has been added. As the air passes through the polyfill, the fibers wiggle and cause some of the energy created by the airspring to be dissipated as heat. This heats the surrounding air molecules warmer, causing the air to become less dense.
Being that sound passes easier through a denser medium, the speaker interacts with your enclosure as if it is larger than it actually is.
This has some very obvious benefits that are inherent of a larger enclosure. Firstly, it becomes more efficient a larger enclosure is always more efficient than a smaller one for any given driver. Second, the f3 or the frequency at which SPL is down by 3dB will be lower, providing a little bigger bottom end. While these are both great advantages, they decrease the effective damping of the speaker as well, meaning the speaker can be more likely to bottom out or over-excurt itself.
Naturally, this is speaker, frequency, and power dependent. If used in a ported enclosure, you will also see the Fb or the resonant frequency of your port drop lower. There are some additional worthy considerations.
Adding polyfill to an enclosure can be a great choice. However, too much polyfill can be a bad thing. At a certain point, the stuffing becomes too dense and the fibers no longer wiggle. At this point, not only have you taken away the size benefit of adding polyfill, you have actually decreased the effective volume as the polyfill is now taking up room inside your enclosure. It is also worth mentioning that polyfill is not as effective in a large enclosure.
Let's combine these two thoughts into two simple rules:. If the enclosure is less than 2. If the enclosure is greater than 2. There is one last point that you will hear from time to time regarding polyfill: that polyfill stops standing waves in an enclosure. When referencing an enclosure for a subwoofer playing a fundamental frequency that falls in the typical range, this is simply false.
A standing wave in this range of frequencies would be several feet long and, thus, unlikely to occur. However, higher order harmonic distortion is possible, and can potentially colour music. Being that these higher order harmonics will be progressively shorter in terms of wavelength , polyfill can be effective for this purpose. However, audibility, particularly at high SPL, can be quite minimal.
Using polyfill in an effort to absorb standing waves or various distortion is most effective in large enclosures for your midrange and is not particularly effective for a subwoofer. Hopefully you now have a greater understanding of what polyfill does and doesn't do, while also enjoying the opportunity to absorb some scientific content as well.
If you're still undecided, be wild and adventurous: put some polyfill in your enclosure right this minute! Great write up. The only issue not really a big deal at all is the air density thing. Fixed volume and fixed mass of air. The only thing that can be raised by heat is pressure. Actually, as the enclosure size increases, the length of the port may decrease if we assume that our port cross-sectional area and Fb stay the same.
But yes, you've got the general idea. Sorry to bring this back up, but I just want to stay on the safe side. I'm running two subs in 1. I stuffed each chamber with approx 14oz of polyfill, but it seems like a lot.
Is just stuffing the box okay? It filled up most of the chamber. I keep hearing that the subwoofer can be damaged if polyfill is just stuffed in, is there a different way I should have put in the polyfill? Thank you. From what I understand, I think Polyfil works in a resistive manner, which goes along with what was explained. You'll get to the point where the bass pretty much dissapears. IIRC, it seemed to limit cone movement as well.
I dunno I ain't too sure My experiences have been by trail and error. Add some fill, listen, add some more, take some out.
It dampens the boom and tightens up the bass a bit from what I have noticed. One way to get rid of boomy sound in a enclosure using polyfil is using a AA battery. Hook the woofer up to the battery, and listen to the DC when connected.
If it's a big thump, add polyfil. Add fill until the thump sounds more like a mild thud. I wonder if that is some general rule of thumb, calling for a pound and a half of polyfil for 2. What I'd like to know is how one could determine the added volume for the amount polyfil that it "fakes" in the enclosure. So one could have a way formula to come up with the numbers for the added volume to add into a box plot program This can be shown in tires, in winter the pressure goes down and in summer it goes up for the same reason, V, n and R are all constants.
This assuming STP though, but that is generally the case. You need to be a member in order to leave a comment. Sign up for a new account in our community.
It's easy! Already have an account? Sign in here. Existing user? Sign in anonymously. Sign in to follow this Followers 2. Recommended Posts. DevilDriver Posted February 26, edited. Let's combine these two thoughts into two simple rules: 1.
Edited February 26, by DevilDriver. Share this post Link to post Share on other sites. Posted February 26, Another great thread! Thank you again for the information. CBFryman 2. Posted March 6, Aaron Clinton 2, Posted March 7, Nice job neil! Posted September 21, Posted November 18, Posted November 19, Posted November 20,

Dumb question- speakers
Lots of reviews on polyfill, fiberglass, denim insulation and others. Per pound fiberglass is the most cost effective if you need a lot of it. However for a small box polyfill from cheap pillows from IKEA, a DIY store or what is nearby is cheaper as you can get a smaller amount than fiberglass. I newer use fiberglass and I have spare insulation in the attic for "free" as polyfill and the like is so much nicer to handle. Avoid covering the crossover with insulation, even if the losses is only a watt or two if well insultated the components can get really hot.
Tame The Boom, Grow Your Cab: The Wonders of Polyfill
View Full Version : what happens when you put polyfill in a ported enclosure? Polyfill will make a subwoofer perform as if it were in a larger enclosure by slowing sound waves as they pass through the polyfill. The physical internal volume of the subwoofer box remains the same, yet the effective internal volume changes when polyfill is added. Sealed subwoofer boxes are the best candidates for polyfill. It is possible to use polyfill in a ported enclosure, but this is not recommended, as it would then change the tuning of the box. Sealed subwoofer boxes generally yield a better, flatter frequency response curve when the enclosure is larger to a certain point. If you need a subwoofer box of a given size, and your available trunk dimensions do not allow you to customize a subwoofer box with enough internal volume, it is possible to get the subwoofer enclosure built a little smaller than desired and have polyfill added. This will make the subwoofer box "appear" larger to the subwoofer. I just cut my box down a little because it was taking up too much room, but it definitely lost some of its punch.
Speaker Polyfill Vs. Foam

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How much polyfill do I need for subwoofer box?
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A cheap source of poly fill?
Only In Stock. Acousta-Stuf, a synthetic material made from crimped fibers, is an excellent choice for filling or stuffing small enclosures or transmission line cabinets. Long fiber wool has been a favorite among serious speaker builders but Acousta-stuf is less expensive than long fiber wool and does not have the problem of harboring moths. Acousta-Stuf sound absorption damping fiber deepens bass, provides cleaner midrange, and improves the dynamic extension of any speaker system. For best results it is recommended to loosely fill the material throughout the enclosure.
12.24 What is the best "stuff" to fill a speaker cabinet with?
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How Much Poly-Fill Do I Need For A Sealed Subwoofer
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White Polyfill for Speaker
The sound wave coming off the back of your subwoofer reacts with the air contained in the box. Polyester fiber stuffing slows down sound waves inside the box, making the subwoofer perform as if the box were bigger. Read the full answer. When the air passes through the Polyfill it is scattered and dissipated by the fibers, causing the air to be less dense. The speaker then interacts with the enclosure as if it is larger than it really is, changing the sound. About the Polyester Fiber Stuffing.
Polyfil inside foam baffles for door speakers?
Polyfill is a synthetic material made from crimped fibers, is an excellent choice for filling or stuffing small enclosures or transmission line cabinets. Long fiber wool has been a favourite among serious speaker builders but Polyfill is less expensive than long fiber wool and does not have the problem of harboring moths. Polyfill also outperforms Dacron, Foam, and Fiberglass.
I have logs in root, the news came out
The highest number of points is achieved. I think it is a good idea. I agree with you.