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-   -   Absorber Panel Air Gaps (https://www.gearslutz.com/board/studio-building-acoustics/1284146-absorber-panel-air-gaps.html)

TomTurner 23rd October 2019 10:11 PM

Absorber Panel Air Gaps
 
Hi All!

Is a 75mm deep absorber more or less effective than a 50mm with a 25mm air gap?

Also by extension is a corner bass trap more or less effective by filling the entire corner with absorbing material vs having an air gap behind a panel of absorbing material, with the same frontal area.

Thanks!

Jason Foi 23rd October 2019 11:09 PM

Assuming proper material selection for the depth, full fiber fill is better. 200mm is considered minimum depth for porous absorbant.

Soundman2020 24th October 2019 01:25 AM

Quote:

Originally Posted by TomTurner (Post 14281868)
Hi All!

Is a 75mm deep absorber more or less effective than a 50mm with a 25mm air gap?

The will both cover down to the same frequency, but the 75mm one will be a bit more effective, and will have smoother absorption (slightly flatter). And as Jason said, 75mm isn't very much... 200mm or more is good.

- Stuart -

avare 24th October 2019 02:08 AM

Both will work the same with the proper materials. The BBC has built absorbers with to 6:1 cavity to material thickness.

The BBC R&D has budgets resembling small countries' budgets. Thank you Eric Desart for that line.

TomTurner 24th October 2019 09:55 AM

Thanks All!