Irrational ratios/enclosure dimensions
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 11th December 2005, 01:12 PM #1 Vikash   diyAudio Moderator Emeritus     Join Date: May 2003 Location: UK Irrational ratios/enclosure dimensions I've updated the standing wave calculator to calculate dimensions based on ratios. I've added one useable ratio so far. If anyone can help give me other irrational ratios suitable for speaker enclosures in x/1/y format, that would be very helpful. http://www.vikash.info/audio/standing_wave_calc/ __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
 11th December 2005, 01:47 PM #2 Geek diyAudio Member     Join Date: Sep 2004 Very handy. Thanks!
 11th December 2005, 09:33 PM #3 Curmudgeon   diyAudio Member   Join Date: Nov 2005 I've had good luck with the cube root of 2; .794/1/1.26; and variants such as .794/1/2.52.
 12th December 2005, 10:33 PM #4 Vikash   diyAudio Moderator Emeritus     Join Date: May 2003 Location: UK Updated with new ratios. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
 12th December 2005, 11:29 PM #5 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN The square root of 2 is ~1.414, not 1.141. Usual quoted enclosure ratios are based on: phi = golden ratio = 1.6180339887499 why do I remember this number to so many decimal places? 1.2 1.25 IMO, none of these is better than any other or any number you could come up with. It makes a lot more difference how you mount your drivers on the baffle (for diffraction) than what the box dimension ratios are. Lining or stuffing in the box is used to damp out the resonances..... Your app calculates axial resonances, but there are also tangential and oblique resonances, and all are excited differently depending on where you mount the drivers... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 13th December 2005, 12:37 AM #6 Curmudgeon   diyAudio Member   Join Date: Nov 2005 Tapered boxes are good too; but these ratios are certainly better than integers, 1/2/2 for example. AND you should also line &/or stuff. Nothin' wrong with belt and braces. And positiong drivers non-equidistant from box edges, (which should have radii > 4 inches) also helps. But one thing at a time, this is a nifty little calculator.
Cloth Ears
diyAudio Member

Join Date: Dec 2001
Location: Melbourne, Australia
Quote:
 Originally posted by Ron E Usual quoted enclosure ratios are based on: phi = golden ratio = 1.6180339887499 why do I remember this number to so many decimal places? 1.2 1.25 IMO, none of these is better than any other or any number you could come up with...
Ron,

Agreed. But I tend to use the square root of phi (c. 1.27202) for the front of my woofer and subwoofer boxes as it looks better, rather than for any sound reasons. That way the ratio W/H is 1.618/1 (and when you're looking at it from a standing position, perspective also fools you into thinking it's the same ratio W/D).

Internal standing waves I try to damp out (or confuse) by:
1) damping materials;
2) internal bracing with small (eg 2" or 3") holes in it;
3) internal bracing at odd angles and shapes (eg. dowels of different sizes, braces at 15, 22.5, 30 and 45 degrees).

UNLESS I'm doing a TL...

But, Vikash, I think you've got 1.28 in your calculator anyway - and that's close enough to 1.27202
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."

 13th December 2005, 09:32 AM #8 planet10   frugal-phile(tm) diyAudio Moderator     Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Nice tool Vikash.... dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA
 13th December 2005, 11:47 AM #9 Vikash   diyAudio Moderator Emeritus     Join Date: May 2003 Location: UK Any input on the default threshold value? How close is too close? __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
 13th December 2005, 12:43 PM #10 Vikash   diyAudio Moderator Emeritus     Join Date: May 2003 Location: UK Added ability to factor ratios. What's the best way to render a pic on the web these days. Is it somehow possible to output code into renderer that output to a gif or something... __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

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