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MultiWay Conventional loudspeakers with crossovers 

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23rd November 2012, 08:56 PM  #662 
diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.

Good to know, thanks!
GM
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23rd November 2012, 08:57 PM  #663 
Speakerholic
diyAudio Moderator

All cells on the 1803 are true and plumb. All terminate on the same radius curve as the front, making the center of the diaphragm the focal point, so once the sound leaves the waveguide it travels equal distance to enter all cells.

23rd November 2012, 08:59 PM  #664 
Speakerholic
diyAudio Moderator

That's not right. The focal point is just behind the mounting flange, inside the waveguide, about an inch or so.

23rd November 2012, 09:48 PM  #665 
diyAudio Member

Stepping into the middle of this conversation here are a few of my thoughts, Determining the length and final mouth size should be the easiest part of this equation. Whether it is a single cell horn or a 16cell multicell the mathematics will be the same. As long as you are following the model of the equal cells you just divide the crosssectional area at any point by the number of cells.
Where is it written in stone that the cell need to be rectangular or squared in shape? Remember that when they made the original Altec Multicell horns that there was a limit to what materials they had to work with. This also limited what they did with the crosssectional shape changes. There are many other ways that the shape change can happen and inner and outer cells can be different in crosssectional change while the overall expansion rate of combined cell area is identical for the final cutoff frequency. 
23rd November 2012, 10:16 PM  #666 
diyAudio Moderator

Nowhere. I've often thought about hex cells, like a honey comb, or a combination of shapes, like the skin of a football. (soccer).

23rd November 2012, 10:21 PM  #667  
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Join Date: Jun 2008

Quote:


23rd November 2012, 11:43 PM  #669  
diyAudio Member

Quote:
Quote:
Quote:
Does axial length mean the distance between centres, from throat to mouth? I get the mouth area (in the 1005's case 6.25"x6.25"=39.0625") and maybe axial length (15" for the 1005) Is it throat area that I then need then to calculate the flare? Thanks for all the effort into this guys  once I've got my brain round it I'll be glueing my fingers together in a flash!!
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24th November 2012, 12:19 AM  #670  
Speakerholic
diyAudio Moderator

Quote:
So in any horn of this type, the center will be wider than the lower rows independant of the number of rows. 

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