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Multi-Way Conventional loudspeakers with crossovers

SilenceAir: Noise Blocking Bricks
SilenceAir: Noise Blocking Bricks
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Old 15th October 2004, 07:29 PM   #1
jdybnis is offline jdybnis  United States
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Default SilenceAir: Noise Blocking Bricks

Anybody know how these work ? Helmholtz resonators?

SilenceAir looks like a transparent brick, and uses "passive resonators" to allow fresh air into buildings while leaving 85% of the noise behind. The arrays of resonators inside the bricks are tuned to block sounds in the range of 500Hz to 2kHz.
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Old 15th October 2004, 08:31 PM   #2
Timn8ter is offline Timn8ter  United States
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That would be my guess, a tuned band stop filter i.e.; Helmholtz resonator.
http://www.kettering.edu/~drussell/G...s/Filters.html
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