Helmholts Resonance

jamikl · 29th April 2006, 12:49 AM

Could someone tell me please the formula for helmholtz resonance of a small chamber with opening as is used on a couple of TL enclosures to remove higher resonances either from speaker or line harmonics.
How do you size the chamber?
Can a small chamber off a port be used to remove or lower the level of the harmonics in a BR port?
jamikl

kelticwizard · 29th April 2006, 01:38 AM

I think you might be interested in looking at Martin J King's page, the Mass Loaded Transmission Line enclosure.

http://www.quarter-wave.com/Projects.html

It is a sort of enclosure which is tall and skinny, uses both quarter wave and bass reflex principles, and eliminates the upper resonances of the Transmission Line.

29th April 2006, 12:49 AM	#1
jamikl diyAudio Member Join Date: May 2005 Location: Melbourne	Helmholts Resonance Could someone tell me please the formula for helmholtz resonance of a small chamber with opening as is used on a couple of TL enclosures to remove higher resonances either from speaker or line harmonics. How do you size the chamber? Can a small chamber off a port be used to remove or lower the level of the harmonics in a BR port? jamikl

29th April 2006, 01:38 AM	#2
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	I think you might be interested in looking at Martin J King's page, the Mass Loaded Transmission Line enclosure. http://www.quarter-wave.com/Projects.html It is a sort of enclosure which is tall and skinny, uses both quarter wave and bass reflex principles, and eliminates the upper resonances of the Transmission Line. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

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