Acoustic dampening material used to diffuse backwaves absorbs them right? What if they were just scattered?
All of the dampening material I have seen is somewhat soft or absorbent. I have used polyfill, that dynamat rubber jelly stuff, and spray deadening which is still chalky and porus. In an application such as folded horns where the ports are normally lined with felt or transmissionlines that are stuffed with polyfill, these dampening materials actually take sound away. Has anyone played around with hardened materials that would scatter, but not absorb backwaves for the same effect without a loss of sound? I am thinking like the texture of a felt mold when the first coat of fiberglass resin is applied.
Replies (1)
swez on 01/30/2007 07:45:28
As you have already figured out, soft and pourous materials absorb sound. Hard surfaces will tend to reflect/deflect sound.
When employing wave guides and corner blocks designed to channel or funnel sound, use hard materials. Felt, coated with fiberglass resin/hardners should work out fine as a reflector.
Swez
All of the dampening material I have seen is somewhat soft or absorbent. I have used polyfill, that dynamat rubber jelly stuff, and spray deadening which is still chalky and porus. In an application such as folded horns where the ports are normally lined with felt or transmissionlines that are stuffed with polyfill, these dampening materials actually take sound away. Has anyone played around with hardened materials that would scatter, but not absorb backwaves for the same effect without a loss of sound? I am thinking like the texture of a felt mold when the first coat of fiberglass resin is applied.
Replies (1)
swez on 01/30/2007 07:45:28
As you have already figured out, soft and pourous materials absorb sound. Hard surfaces will tend to reflect/deflect sound.
When employing wave guides and corner blocks designed to channel or funnel sound, use hard materials. Felt, coated with fiberglass resin/hardners should work out fine as a reflector.
Swez
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