Mass Loading Woofer

Moondog55 · 18th March 2008, 12:04 AM

While researching I came across this article; others may find it useful, I have to admit the math is more than a little beyond me.

http://www.birotechnology.com/articles/mass.html

It answered a couple of my questions so it may help others

bjorno · 18th March 2008, 01:27 AM

FYI: Mass loading a driver by applying weights will result in a higher Qts and a lower fs and is often not a good idea or combination but a method that is changing Qm to lower Ots instead is often more useful:

http://www.diyaudio.com/forums/showt...183#post976183

http://www.diyaudio.com/forums/showt...19#post1120919

b

Moondog55 · 18th March 2008, 01:55 AM

Thanx Bjorno; but in this particular instance I was interested in raising Qts and Qms to adapt a particular driver to a sealed box, I have used passive methods in the past with mixed and variable results, but sometimes cash flow and budget retraints mean we have to use what is already on the shelf.
Much better to buy a driver that meets my needs but WAF gets in the way sometimes and SWMBO holds the purse strings this month

18th March 2008, 12:04 AM	#1
Moondog55 Dilletante, tinkerer and beggathoner supreme diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Mass Loading Woofer While researching I came across this article; others may find it useful, I have to admit the math is more than a little beyond me. http://www.birotechnology.com/articles/mass.html It answered a couple of my questions so it may help others __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

18th March 2008, 01:55 AM	#3
Moondog55 Dilletante, tinkerer and beggathoner supreme diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Thanx Bjorno; but in this particular instance I was interested in raising Qts and Qms to adapt a particular driver to a sealed box, I have used passive methods in the past with mixed and variable results, but sometimes cash flow and budget retraints mean we have to use what is already on the shelf. Much better to buy a driver that meets my needs but WAF gets in the way sometimes and SWMBO holds the purse strings this month __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

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18th March 2008, 01:27 AM	#2
bjorno diyAudio Member Join Date: Mar 2005 Location: Jacobsmountain	FYI: Mass loading a driver by applying weights will result in a higher Qts and a lower fs and is often not a good idea or combination but a method that is changing Qm to lower Ots instead is often more useful: http://www.diyaudio.com/forums/showt...183#post976183 http://www.diyaudio.com/forums/showt...19#post1120919 b