Speaker stuffing material
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We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience. Necessary Always Enabled. Non-necessary Non-necessary.Each speaker has its own sealed box within this cloud see diagram below.
Each box is roughly 3. I've set the crossover settings for my Atmos speakers to 80Hz, so we're not dealing with subwoofer level frequencies here. I need a solution that is suitable for a sealed enclosure from 80Hz - 23KHz.Marshall Speaker Cabinet Insulation Vs No Insulation
I also have 25mm and 50mm thick mineral wool sheets left over from my acoustic treatment panels I built. Unfortunately I don't have the luxury of trying out different materials through trial and error, and I also can't measure the results etc.
So it will just end up being a best effort. Try the internet for the wool. Should be able to source some. Check some diy speaker supply websites. Thanks for your input Panelhead. I've searched high and low and even spoken to a few wool dealers in South Africa, and none of them are entirely sure what the audiophiles are referring to when they say Long Fiber Wool.
The closest I could get to that here is the Karakul Wool I linked to above, but I don't know if this product would have the right acoustic characteristics. However if the outcome of this thread is that I should be using Long Fiber Wool, then I'll ask them what it would cost to send it to me. Per Dickason's "Loudspeaker Design Cookbook" Acousta-stuf is the best cabinet fill for the speakers that are designed to have it.
Not all are. And second best was polyester fiberfil meant for pillows. Its fibers I think are crinkled to reduce density.How to install desklets in mint
I believe that both the bandwidth and the absorption for HD fiberglass is very much better than polyester stuffing. Melamine foam is extremely effective in absorbing especially at low frequencies. Little else does so well below Hz. Don't know it's the best Menards sells it for 3.
12.24 What is the best "stuff" to fill a speaker cabinet with?
You need this cavity to be fully resonant so the woofers can most effectively drive the vent into resonance. You can damp the bottom corners and the area above the top woofer solid with damping.So what is the best material to fill it with? The maker may have a recommendation. Cat Litter. Unused of course.
Works as good as anything else I have tried over the years. There is a wide variety of materials sold as cat litter these days, some of it weighing very little, so it might be worth saying which sort you use. Have you ever caught the cat squating on the speakers?
The heavy stuff.
Sand was deemed most effective. However, I rather like the idea of salt, purely because of the smaller grains. My only work would be possible corrosion to the stands. This was assessed by looking at real-time frequency analysis and the amount of vibration in the stands. I also looked at various spikes, stiffness and stands. Whats so special about salt?? You could try water. That will definitely dampen it. You could even melt some gelling agent into it so it sets like a jelly.
Should add more definition to wobbly basslines.Br ific n° 2413 index/indice
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I have a very simple question that has me wondering about speaker stuffing - and no, not the kind of stuffing that makes you belch after a meal. I know that stuffing can increase the "effective" volume of an enclosure, but is that property primarily restricted to sealed cabinets?
Does the same thing occur when applied to vented enclosures? Does the increase in effective volume change the tuning of vented enclosures? Tags: None. Originally posted by gdmoore28 View Post. Comment Post Cancel. Chris Roemer. Just my O, but stuffing can't really "effectively" make an undersized box "seem" larger to a driver, not like it can a closed box.
A ported cabinet relies on the resonance of the air in the cabinet to get its lower frequencies, so too much stuffing doesn't take much will damp that resonance and make the ported cabinet not work so well anymore.
A sealed cabinet largely keeps the bass energy from the back of the cone from getting out to cancel the energy from the front of the cone -- damping the air in the cabinet doesn't hurt that and to sa degree can make the cabinet act as if it were larger. Originally posted by Chris Roemer View Post.
Just my O, but stuffing can't really "effectively" make an undersized box "seem" larger to a driver. Sometimes stuffing is warranted in vented boxes. If you have a high-Qts driver, sometimes a stuffed vented box will tame the peaked response and ripple well enough to be a decent result in the end.
As a ROT, I like placing a good handful behind the woofers in my designs. Paul does this in the Overnight Sensations as well. Later, Wolf. Originally posted by billfitzmaurice View Post. It's not just your O, it's fact. Stuffing lowers Q, which can help tame a midbass hump, but it doesn't lower F3, and it reduces overall sensitivity. You can model it in WinISD 0. Ql is leakage losses, Qa is absorption losses. The default Qa of is a bare box, 50 is a lined box, 10 is stuffed but not compressed, 5 is stuffed and compressed.All vibrating objects produce sound pressure waves.
These can act as a form of airborne interference and spoil the overall listening experience. For best cabinet acoustics we require a speaker cabinet to be acoustically dead and a number of designs exist to meet this criteria with varying degrees of success. These range from using very heavy paneling materials, e.
A variety of materials attached to the interior of the cabinet can also modify it's response. The fact that there are so many options suggests no one approach is optimum for all occasions, disregarding the cost considerations of course.
Loudspeaker Cabinet Damping Materials.
Vibrating panels effectively act as large speaker cones with a small peak amplitude. These have selective modes of vibration, resonancesand can be of sufficient amplitude to colour the overall sound. In addition the rear radiation from the speaker cone may be reflected around the inside of the cabinet and then back out through the speaker cone.
This all contributes to a background noise which tends to distort the listener's sound experience and give rise to what's known as a 'box sound'. Low priced manufactured items are more prone to this problem as it's an easy area in which to make economies. Increasing the signal volume does little to help as the cabinet noise is increased also.
So what to do? At this stage, it is important to realise that light weight materials can only be effective at high frequencies and that the heavier damping materials progressively take effect at the lower end of the frequency spectrum. So, lets look at the options. Traditionally used to stuff transmission lines, at a density of around gms wool per 28L of enclosure volume, the wool is used as a moderator to the line velocity and thereby tune the line to some desired end result.
Also used to stuff loudspeaker cabinets in which the acoustic properties are applied to provide a small dampening effect on medium frequency output, HF Tweeters often sit in their own enclosure and are therefore unaffected. In addition, the propagation delay through the material is used, to some effect, in closed box designs to acoustically increase the box volume and hence change the characteristics of the box.
The mathematics of this is complicated and is not investigated here. View or buy loose, Sheeps Wool damping materials here.A standing wave occurs when sound energy is reflected between two walls, or a wall and the driver.
If the frequency is right, the reflected sound reinforces the radiated sound, leading to a resonance. The distance between the reflective elements equals half the wavelenth of the resonance.
The following Animation courtesy of Dr. Dan Russell, Kettering University shows this phenomenon. The original waveshown at the top, adds to the reflected wave, shown in the middle. The result, shown at the bottom, is a wave that is stationary, thus known as a standing wave. Another look at standing waves can be found at the University of Toronto.
For an easy way to see what frequencies your box is vulnerable to, grab a copy of boxnotes or sonosub from this site. The lowest frequency standing waves in an enclosure have a maximum velocity in the centre of the box, but zero velocity at the walls. They do however have a maximum variation in pressure at the walls. Full-range speakers have acoustic wool stuffed into the box to remove energy due to friction as the air moves through the fibres.
The effectiveness of this approach diminishes as frequency is reduced. By the time we get below hz, the stuffing is basically useless. For subwoofers, stuffing will not help with the fundamental resonances, however it is still useful for treating harmonics, which may be exicted by distortion from over-driving, or by shallow rolloff slopes in your bass management system.
What can help however, is to treat the walls with something that can convert pressure variations into movement, and then remove energy by internal friction. For rooms, this approach is used by the Modex commercial bass traps to good effect. Inside subwoofers, closed-cell foam seems to work quite well in this application. It has the membrane-like property that can work the magic, and the density to consume some energy by internal friction. Buy your foam from an upholstery supplier or, in Australia, Clark Rubber.This article is from the rec.
The following discussion will focus on practical facts on speaker cabinet stuffing and on sealed systems. Theory is limited help in selecting speaker stuffing.
Vented system do share a few of these same issues and will also be mentioned, but the goals and physics of stuffing a vented box are different than those of a sealed box. NHT speakers use polyester fill. Some use a Danish polyester that mimics the properties of fiberglas very closely.
Excluding this special poly, there are two kinds of polyester available: pillow stuffing, and audio-spec polyester. Forget common pillow fill. It's cheap and easy to get. If you use enough, it will damp the midrange, and that's a lot better than an empty box but it has little effect on lower frequencies. Stearns also sells "Fiberloft Premium Grade Polyester" to some speaker makers. Mountain Mist is a coarser fiber than Fiberloft, but both are the same composition. We have no information on differences in acoustic properties between Fiberloft and Mountain Mist, but Fiberloft makes softer pillows and costs more.
However, these materials do not provide the desired results in a sealed system. They will provide more reflection absorption than polyester, but the latter is quite good in this regard in the critical midrange. In a sealed system you don't want absorption at lower frequencies anyway; you want damping and isothermal conversion. Author's note: I have tried "all-out" efforts using fiberglas lining and polyester fill to achieve the best of both worlds. I found little practical benefit over polyester alone.
Most professional designers agree that practical experience, combined with trial and error is the best way to get optimum stuffing material, quantity, and method for a given design.
This is why good designers routinely experiment with fill in the development of a new system. If you are designing a system that differs substantially in shape or volume or source impedance passive crossover from one of known reference, you will need to experiment to get best performance.
Adjusting the filling is the last step in getting bass right, and is used mostly to fine-tune the system Qtc and resonance.
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