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Quest for Real Bass Traps

caught gesture

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I'm not sure why the Y axis means, but these UK corner mounted bass traps claim great absorption in the bass region. https://www.gbacoustics.co.uk/products/pet-bass-trap-xl
NRC is measured on a scale that ranges from 0 to 1. An NRC of 0 means that the product absorbs no sound. An NRC of 1 means that the product absorbs all sound. This product chart has a fictional axis, therefore the data and conclusions can be considered fictional.
 

ripmixburn

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Let's have a panel discussion
(JPEG Image, 474 × 357 pixels).jpg
 

sarumbear

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FeddyLost

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I wonder if they are making the same mistake
As any false advertising.
I have great doubt that they can make fully porous bass trap with decent efficiency at 100 hz and below within this size.
Maybe they have composition tuned helmholtz+porous? Both layers can be done from PET.
 
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