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mhtplsh View Drop Down
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Joined: 27 August 2007
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    Posted: 01 September 2008 at 1:45pm
I hv visited the following site where i got info about 25Hz Folded Subwoofer Basshorn

http://www.geocities.com/adrian_mack/homepage.html

To study i redrawn the box to get horn length for my study.

But i am getting 2.5m instead horn length of 2.9m as claimed by the adrian mack. 


Driver used : Eighteen Sound 18LW1400
Throat Area                500cm^2
Mouth Area                2000cm^2
Path Length                2.9m
Rear Chamber Volume    95L

The original & redrawn drawing are posted as under.


!) Original Drawing link : http://img82.imageshack.us/img82/3341/25hzhornoriginalzf7.th.jpg
2) Redrawn image drawing : http://img384.imageshack.us/my.php?image=25hzhornredrawnjx1.jpg 


Kindly guide me in the matter about my mistake.







Edited by mhtplsh - 01 September 2008 at 1:47pm
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_djk_ View Drop Down
Old Croc
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Joined: 23 November 2004
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 02 September 2008 at 12:02am
The mouth is too small for 2Pi use.
 
This horn was probably designed to fire into a corner and the extra length is including the external air path too.


Edited by _djk_ - 02 September 2008 at 9:10am
djk
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mhtplsh View Drop Down
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Points: 112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mhtplsh Quote  Post ReplyReply Direct Link To This Post Posted: 02 September 2008 at 3:39am
Originally posted by _djk_ _djk_ wrote:

The mouth is too small for 2Pi use.
 
This horn was probably designed to fire into a corner and the extra length it including the external air path too.


Ok! But how he has calculated the extra length? I know this is designed with .5 pi. I just want to learn how he has designed.
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_djk_ View Drop Down
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Joined: 23 November 2004
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Points: 5992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 02 September 2008 at 9:12am
I would say he added the length from half-way into the corner to the front edge of the cabinet.
djk
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