How big an airgap should I use?

axewielder · 22nd February 2010

Hi folks,

Just a quick question regarding airspace.

Im constructing a few DIY Gobos, primarily for sound absorption but also for a little isolation. The framed up Gobos will consist of:

Fabric Covered 4" 703
Air Gap
1" MDF

How big should the air gap be between the MDF and the 703? I was thinking 2". Would that be okay?

Thanks for any advice,
John.

avare · 22nd February 2010

It depends on low you want to absorb. The good news is that with 4" of 703 type material, you can have a gap as great as 8" and get good absorption. 4" flush will give good absorption down to around 125 Hz. With 8"gap down to around 40 Hz.

Andre

axewielder · 23rd February 2010

Great, thanks for the reply Andre.

Thats amazing, never realised there is potential to absorb to such a low frequency, simply be increasing the air gap (up to a maximum level of absorption of course)

It makes sense then to include as big an air gap as I can manage. I'll definitely do more than 2", probably around the 5" mark. Im happy if the absorption stretches to the 100Hz mark.

Cheers!
John

22nd February 2010	#1
axewielder Gear interested Joined: Feb 2010 Location: UK Posts: 3 Thread Starter	How big an airgap should I use? Hi folks, Just a quick question regarding airspace. Im constructing a few DIY Gobos, primarily for sound absorption but also for a little isolation. The framed up Gobos will consist of: Fabric Covered 4" 703 Air Gap 1" MDF How big should the air gap be between the MDF and the 703? I was thinking 2". Would that be okay? Thanks for any advice, John.

22nd February 2010	#2
avare Lives for gear Joined: May 2004 Location: Hamilton, On Canada Posts: 3,697	It depends on low you want to absorb. The good news is that with 4" of 703 type material, you can have a gap as great as 8" and get good absorption. 4" flush will give good absorption down to around 125 Hz. With 8"gap down to around 40 Hz. Andre __________________ Good studio building is 90% design and 10% construction.

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23rd February 2010	#3
axewielder Gear interested Joined: Feb 2010 Location: UK Posts: 3 Thread Starter	Great, thanks for the reply Andre. Thats amazing, never realised there is potential to absorb to such a low frequency, simply be increasing the air gap (up to a maximum level of absorption of course) It makes sense then to include as big an air gap as I can manage. I'll definitely do more than 2", probably around the 5" mark. Im happy if the absorption stretches to the 100Hz mark. Cheers! John