Baffled. ML King's 4560 - Whither and wherefore?

Dave Jones · 02:43 AM

I ponder the baffle step.

Google googles up many articles that say the f3 point of the baffle step is around 4560/Wb, where Wb is the width of the baffle in inches. It appears there is but one original source for the magic 4560, an article by our own beloved Martin L. King.* One presumes he didn't just pull that number out of his vented enclosure. But there is no rationale given.

4560 is 0.34 times the speed of sound in inches per second. I do not know of any profundities associated with the number 0.34.

Where does that 4560 come from, and why?

* http://www.quarter-wave.com/General/BSC_Sizing.pdf

planet10 · 27th November 2010, 03:58 AM

Quote:

Originally Posted by Dave Jones

It appears there is but one original source for the magic 4560, an article by our own beloved Martin L. King.*

The number is graphically derived from the charts on page 23 of Olson's Acoustics.

dave

rjbond3rd · 27th November 2010, 04:07 AM

Quote:

Originally Posted by Dave Jones

...Martin L. King...

Actually it's Martin J. King!

Dave Jones · 27th November 2010, 04:44 AM

Quote:

Originally Posted by rjbond3rd

Actually it's Martin J. King!

Get the L outa here. I need a J.

motosapien · 27th November 2010, 12:06 PM

Quote:

Originally Posted by Dave Jones

Get the L outa here. I need a J.

LOL - But seriously, Martin's paper on bsc is quite informing. It's starting to gel up for me and that's bound to make this speaker building habit more rewarding. These forums are a lot deeper than they look initially. Reading some of Nelson Pass's articles has the same epiphany effect as Martin's paper above. Like school, only better!

rjbond3rd · 27th November 2010, 10:46 PM

Try this: Speed of sound / pi / 2

See GM's post here: If a baffle is 2 meters wide, what is the frequency where the sound

27th November 2010, 02:33 AM	#1
Dave Jones diyAudio Member Join Date: Jul 2003 Location: Silicon Valley	Baffled. ML King's 4560 - Whither and wherefore? I ponder the baffle step. Google googles up many articles that say the f3 point of the baffle step is around 4560/Wb, where Wb is the width of the baffle in inches. It appears there is but one original source for the magic 4560, an article by our own beloved Martin L. King.* One presumes he didn't just pull that number out of his vented enclosure. But there is no rationale given. 4560 is 0.34 times the speed of sound in inches per second. I do not know of any profundities associated with the number 0.34. Where does that 4560 come from, and why? * http://www.quarter-wave.com/General/BSC_Sizing.pdf __________________ Davy Jones Last edited by Dave Jones; 27th November 2010 at 02:43 AM.

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27th November 2010, 10:46 PM	#6
rjbond3rd diyAudio Member Join Date: Jan 2007	Try this: Speed of sound / pi / 2 See GM's post here: If a baffle is 2 meters wide, what is the frequency where the sound

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