
Home  Forums  Rules  Articles  The diyAudio Store  Gallery  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
MultiWay Conventional loudspeakers with crossovers 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
4th December 2012, 06:06 PM  #11 
diyAudio Member
Join Date: Feb 2010
Location: in half space

Another skeptic, here.
As Mark said, the theory is, the standing wave harmonics will be evenly distributed, but this merely means they will retain the maximum possible energy. I think a more sophisticated cabinet design would cause the standing waves to cancel each other. I think there's nothing special about 1.6180339..... I think any irrational number will do. I also think if you were to try to design a box where the standing waves reinforced each other, you would find it quite difficult, and due to braces and battens, etc., you would not end up with 1' x 2' x 4'. 
4th December 2012, 07:21 PM  #12 
frugalphile(tm)
diyAudio Moderator

Just don't use it twice or you end up with the long dimension twice the smallest one.
I don't hold fast to the golden ratio, but do use irrational numbers to determine aspect ratios of rectangular boes. dave
__________________
community sites tlinespeakers.org, frugalhorn.com, frugalphile.com ........ commercial site planet10HiFi p10hifi forum here at diyA 
4th December 2012, 07:34 PM  #13 
diyAudio Member
Join Date: Mar 2007
Location: Jyväskylä

Here is a neat calculator. Just give a desired midvalue and you'll get the smaller and bigger numbers
Golden Ratio Calculator
__________________
AES Associate Member / My DIY speaker history: 74 Philips 3way, 82 Hifi 85B, 07 Zaph L18, XLS10+PR/Hypex, 08 CSS125FR, 08 Hifitalo AW7, 08 TangBand FR, 09 MarkK ER18DXT, 13 PPSL470, 13 AINOgradient 
4th December 2012, 07:46 PM  #14 
diyAudio Member
Join Date: Feb 2004
Location: Chinook Country.Alberta

GR is so much more...
...than just visually appealing. It's defined as
GR:=[1 +/ (5)^3]/2 Our bodies are formed using this ratio, as well as most everything in nature. Strictly speaking, it is the one "perfect ratio". The Fibanicci series becomes this at the limit as x>0 (IIRC). P10's statement regarding the use of irrational numbers as ratios is for all practical purposes suitable.
__________________
stew ☮ "A sane man in an insane world appears insane." 
4th December 2012, 08:20 PM  #15  
diyAudio Member
Join Date: Nov 2009
Location: The Mountain, Framingham

Quote:
Again, with enclosures, it only makes sense to worry about the distribution of resonances if you plan to do nothing about them. Since internal stuffing can do a good job of damping I wouldn't worry about exact dimension ratios. David S. 

4th December 2012, 08:26 PM  #16  
frugalphile(tm)
diyAudio Moderator

Quote:
dave
__________________
community sites tlinespeakers.org, frugalhorn.com, frugalphile.com ........ commercial site planet10HiFi p10hifi forum here at diyA 

4th December 2012, 08:36 PM  #17 
diyAudio Member
Join Date: Nov 2009
Location: The Mountain, Framingham

It doesn't hurt in a "belt and suspenders" sort of way (braces for the Brits). Still, the only time I've seen standing waves that defied treatment was with very tall towers, i.e. with extreme aspect ratios. With cabinets close to the usual 2 cubes high ratios I find good absorptive material (FG and Rock Wool) do a pretty good job, even as linings.
David S. 
4th December 2012, 10:18 PM  #18 
Banned
Join Date: May 2012


4th December 2012, 11:24 PM  #19 
diyAudio Member
Join Date: Feb 2010
Location: in half space

Given my carpentry skills, the numbers are going to be irrational no matter what I do.

4th December 2012, 11:28 PM  #20  
frugalphile(tm)
diyAudio Moderator

Quote:
And if you have a tower with an extreme aspect ratio you need to treat it as an MLTL not a BR, and you usually want to take advantage of the 1/4 wave resonance to get more/lower bass extension. dave
__________________
community sites tlinespeakers.org, frugalhorn.com, frugalphile.com ........ commercial site planet10HiFi p10hifi forum here at diyA 

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
The Golden Ratio of 1.618  PrecisionAudio  MultiWay  43  11th October 2012 03:15 PM 
The Golden Ratio Stage  Stee  Solid State  7  22nd February 2009 08:46 PM 
Golden Ratio Height  edjosh23  Full Range  13  3rd February 2009 09:52 PM 
Golden Box Ratio  Important or not?  Ornlu  Subwoofers  5  27th May 2005 06:52 AM 
Golden ratio  Example?  icebear  MultiWay  5  17th April 2004 08:40 PM 
New To Site?  Need Help? 