Absorption Coefficients Below 125hz?

morebutter · 11th January 2009

I am trying to figure out what the performance is of 703, 705, and 1280 is below 125hz. The specs I have seen only go down to 125hz. The area I am most concerned about is below 125 hz, down to 30hz. Any specs for this range anywhere?

Tomer1 · 11th January 2009

You should look at the specs regarding gas flow resistance, insert this figure into an absorber calculate to estimate the performance below 125hz.

nosebleedaudio · 11th January 2009

The BBC stated that the thickness should be around 4% of the wavelength of the frequency, so for ex. 30Hz would be 1130/30= 37.66* .04= 1.5' or 18".
This is for Full absorption.

Ethan Winer · 11th January 2009

See this:

Density Report

--Ethan

11th January 2009	#1
morebutter Gear addict Joined: Jun 2006 Location: Northeast Corridor Posts: 463 Thread Starter	Absorption Coefficients Below 125hz? I am trying to figure out what the performance is of 703, 705, and 1280 is below 125hz. The specs I have seen only go down to 125hz. The area I am most concerned about is below 125 hz, down to 30hz. Any specs for this range anywhere?

11th January 2009	#2
Tomer1 Lives for gear Joined: May 2006 Location: Haifa,Israel Posts: 1,282	You should look at the specs regarding gas flow resistance, insert this figure into an absorber calculate to estimate the performance below 125hz. __________________ http://www.myspace.com/tomervalve

11th January 2009	#3
nosebleedaudio Lives for gear Joined: Jun 2005 Location: Birmingham, AL USA Posts: 3,700	The BBC stated that the thickness should be around 4% of the wavelength of the frequency, so for ex. 30Hz would be 1130/30= 37.66* .04= 1.5' or 18". This is for Full absorption. __________________ Michael Keith www.jmkaudio.com

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11th January 2009	#4
Ethan Winer Gear Guru Joined: Oct 2002 Location: New Milford, CT, USA Posts: 12,333	See this: Density Report --Ethan