Improving noise reduction for ear muffs

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SUMMARY

The forum discussion focuses on improving the noise reduction capabilities of ear muffs, specifically addressing issues with the lining material that can amplify internal body sounds rather than block external noise. Users suggest exploring multiple layers of different materials to enhance sound attenuation, as single-layer linings may not provide adequate noise reduction. The conversation highlights the importance of selecting comfortable materials that do not create a stethoscopic effect, which can lead to an uncomfortable listening experience. Ultimately, the goal is to achieve effective sound protection while maintaining comfort.

PREREQUISITES
  • Understanding of acoustic principles and sound attenuation
  • Familiarity with materials used in soundproofing and insulation
  • Knowledge of ear anatomy and how sound is perceived
  • Experience with DIY repair techniques for audio equipment
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  • Research materials suitable for soundproofing, such as memory foam and acoustic foam
  • Explore the concept of acoustic impedance and its effect on sound attenuation
  • Learn about multi-layer soundproofing techniques and their applications
  • Investigate the design principles of ear defenders versus ear muffs
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Individuals interested in DIY audio equipment repair, sound engineers, and anyone seeking to enhance the noise reduction capabilities of ear muffs or ear defenders.

Glype11
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The lining on my ear muffs which contact the ears, developed cracks and eventually split apart. I decided to try and repair the muffs, so they would have noise reducing qualties than those were better than any typical store bought muffs.
Unfortunately, the finished product, reduced the outside noise, while amplifying the sound of my heartbeat and respiration. The net result was a louder sound with the muffs on than off. Moreover, the material I choose for the lining was hot and uncomfortable on the ears.
I realize the issue is with lining which acts like a stethoscope. What would be a good choice of material to use for the lining?
 
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Glype11 said:
The lining on my ear muffs which contact the ears, developed cracks and eventually split apart.

I think of the purpose of ear "muffs" as providing warmth. Ear "protectors" or ear "defenders" provide sound protection.

What would be a good choice of material to use for the lining?
Perhaps you shouldn't restrict your thinking to one material. What about several layers of different materials? You could use the original materials in the layer next to your ear if those materials were comforable and non-stethoscopic.
 
Stephen Tashi said:
I think of the purpose of ear "muffs" as providing warmth. Ear "protectors" or ear "defenders" provide sound protection.
No, there are acoustic and thermal muffs.
Perhaps you shouldn't restrict your thinking to one material. What about several layers of different materials? You could use the original materials in the layer next to your ear if those materials were comforable and non-stethoscopic.
There's no sense in using more layers than the original. The orginal linings have split apart and not usable.
 
Glype11 said:
Unfortunately, the finished product, reduced the outside noise, while amplifying the sound of my heartbeat and respiration.
That is very hard to judge. You normally don't notice the sound of blood flowing near your ears because of the external background noise.

When you block your ears you should hear a rumbling noise centred on about 15 Hz. Maybe your ears are being closed by pressure on the tragus in front of your ear canal, from the lining in the modified muffs. Press the tragus with a finger hear the sound of blood flow.

Glype11 said:
There's no sense in using more layers than the original.
Well actually there is. Each change in acoustic impedance will reflect energy. By using two layers with air between them, you get more attenuation than one normal layer.