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Damping material for speakers

Discuss Damping material for speakers at the DIY within the HiFiVision.com - Audio Video Hi-Fi Forum; I have used Bitumen Roofing felt to dampen vibrations in a few of my designs ...

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  #11  
Old 25th August 2010, 02:23 PM
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Re: Damping material for speakers

I have used Bitumen Roofing felt to dampen vibrations in a few of my designs and it works very very well,its cheap and readily available ,stick on with a good epoxy based glue and your set.
Another product I have used and it works like a charm is 3M floor matt (the kind that has squiggly lines on one side and vinyl on the other, the vinyl sticks on and helps dampen vibrations while the squiggly lines help absorb standing waves and break them up.
You should ideally use a mix of substances ,use damping for vibration ,then a layer of open cell foam and top off with a layer of long fibre wool mixed with dacron and glass wool.
Another concept I have seen some people use with good effect is to hang curtains(basically sheets of fabric) of different materials inside the speakers ,one person I know used a sheet of jute ,then thick cotton , then felt ,and finally the back wall had a layer of glass wool.All the hanging sheets had holes made in an alternating pattern and of various sizes so that the holes dont over overlap.He used this treatment for the Midrange section the driver he was using was a paper driver,and I can tell you that it worked brilliantly.

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Old 25th August 2010, 02:41 PM
 
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Re: Damping material for speakers

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Originally Posted by keith_correa View Post
IMO, damping is different from stuffing. Dacron fibre et al are used for stuffing whereas Blackhole 5 et al is used for damping. Please correct me if I'm wrong.
KC, Isn't the core intention of stuffing is damping a few undesirable frequencies induced due to the cabinet vibration? Please correct me if I am wrong here.
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Old 25th August 2010, 02:47 PM
 
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Re: Damping material for speakers

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Originally Posted by Adhiraj View Post
I have used Bitumen Roofing felt to dampen vibrations in a few of my designs and it works very very well,its cheap and readily available ,stick on with a good epoxy based glue and your set.
Wow Adhiraj, I am really amazed to see that the idea which I had disposed off, thinking of it as an overkill, is already been implemented by you!! Kudos to you.
Even at times i had thoughts about applying hot and molten bitumen layer on the interior of the speaker canbinet! I think that would make a hell of a Dead Cabinet (But to apply this idea I will have to steal bitumen from the road construction site )
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Old 25th August 2010, 02:50 PM
 
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Re: Damping material for speakers

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Originally Posted by t.antony View Post
I had used loose bundles of paddy straw for lining the back and sides of my boxes, there was noticeable improvement in the lower mids compared to stuffing with Dacron.

If you choose to experiment, make sure to treat the straw with an insecticide and dry it thoroughly before bundling.

Regds...
Paddy Straw!! That's an innovative idea!!
I think it would be the cheapest option.
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Old 25th August 2010, 03:24 PM
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Re: Damping material for speakers

Bitumen Roofing felt is available in sheets you can stick with glue, I have never poured tar into my speaker enclosures although I am tempted to try this approach ,will have to contact the road repair guys but I have to say the Idea of hot bonding bitumen to the panels is intriguing ,you can come up with your own proprietary mix!

Also the core intention of damping is to reduce vibrations that are produced by the enclosures ,the core intention of stuffing if to remove standing waves and prevent sound from going back out into the room through the cone by way of internal reflections.Both are separate and need to be addressed.

These links might be of some help and should help sort out your damping/stuffing conundrum
Cabinet damping
get stuffed [English]
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Old 25th August 2010, 03:57 PM
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Re: Damping material for speakers

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Originally Posted by vivek.saikia View Post
Hi All,

Is this speaker damping material available in India? Any pointers will be appreciated.

I am using the same material to damp the windows in my music room. Looks cool.
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Old 25th August 2010, 05:19 PM
 
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Re: Damping material for speakers

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I am using the same material to damp the windows in my music room. Looks cool.
Where did you get that stuff and at what price?
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Old 25th August 2010, 05:20 PM
 
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Re: Damping material for speakers

I too am trying to figure out an effective way to damp the speaker box. One strategy that seems to be promising is to use a CLD or Constrained Layer Damping sheet to line the inside of the speaker cabinet.

We can buy a CLD product meant for the automotive industry - I guess that a damping solution that effectively damps structural vibrations as well as road/engine noise in a car should also work well for a speaker. 3M India makes a sound damping foil, and there are other products such as Second Skin Damplifier Pro. 3M also makes a sprayable product called Schutz that is meant to deaden sound.

Alternately, this principle could be incorporated in the cabinet wall itself by using a composite layered wall glued together instead of using a single block of MDF or ply.

Has anyone tried any of these products in a speaker cabinet or a car?
Would this work?
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  #19  
Old 25th August 2010, 05:37 PM
 
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Re: Damping material for speakers

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Originally Posted by asliarun View Post
I too am trying to figure out an effective way to damp the speaker box. One strategy that seems to be promising is to use a CLD or Constrained Layer Damping sheet to line the inside of the speaker cabinet.

We can buy a CLD product meant for the automotive industry - I guess that a damping solution that effectively damps structural vibrations as well as road/engine noise in a car should also work well for a speaker. 3M India makes a sound damping foil, and there are other products such as Second Skin Damplifier Pro. 3M also makes a sprayable product called Schutz that is meant to deaden sound.

Alternately, this principle could be incorporated in the cabinet wall itself by using a composite layered wall glued together instead of using a single block of MDF or ply.

Has anyone tried any of these products in a speaker cabinet or a car?
Would this work?
The damping materials used for automobiles will reduce the cabinet resonance effectively, but I am quite sceptical about their sound absorption (or worse reflection) properties. They should not induce undue reflections inside the cabinet, making the situation worse.
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Old 25th August 2010, 08:21 PM
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Re: Damping material for speakers

Quote:
Originally Posted by vivek.saikia View Post
KC, Isn't the core intention of stuffing is damping a few undesirable frequencies induced due to the cabinet vibration? Please correct me if I am wrong here.
The use of damping is correct for what you mention.

IMO, stuffing is used to reduce internal reflections, reduce standing waves and increase the perceived volume of the box.

Edit: Oops! I see Adhiraj beat me to it [explanation for stuffing] though he did not mention the volume thing.

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