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Old 6th February 2011, 10:47 AM   #1
3GGG is offline 3GGG  Australia
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Default Help needed 40Hz to 450Hz

I need help for a design for bass enclosure which give 40Hz (or lower) to 450 hz. The higher the effeciency the better. They are to go with a B&C dcm 50 in an Azura horn with fostex T500amk2 on top. Budget is not GOTO but $$$ is ok.
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Old 6th February 2011, 01:07 PM   #2
Bill F. is offline Bill F.  United States
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Hornresp is a great simulator. Here's a model I did for a ported horn that fits your bandwidth.
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Old 6th February 2011, 01:38 PM   #3
Helmuth is offline Helmuth  Netherlands
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Is this what you are looking for?
Click the image to open in full size.

That is hard to find look here.Back Loaded Horns
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Old 6th February 2011, 08:55 PM   #4
3GGG is offline 3GGG  Australia
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Thanks Helmuth
Looks promising. Am i correct this is a 15" in a front loaded horn? I see a sketch of a horn a few times in the thread but I am unsure about further details.
If you care to could you post detaails of the driver and enclosure/horn used so i can learn more about the design you have simulated.
Regards
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Old 6th February 2011, 09:20 PM   #5
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by 3GGG View Post
Thanks Helmuth
Looks promising. Am i correct this is a 15" in a front loaded horn? I see a sketch of a horn a few times in the thread but I am unsure about further details.
If you care to could you post detaails of the driver and enclosure/horn used so i can learn more about the design you have simulated.
Regards
Yes it is a front-loaded bas-mid horn Detail are to find in the last post including the txt file that you can import in hornresp and play with.

The drawing is a suggestion how to build the beyma simulation would fit in a cube of 60cm same as 2feet with a triangle sealed volume. Like the La scala horn.

You should design the horn your self with the data in the simulation. It is a conical horn so it is easy to calculate and make the flare.
Click the image to open in full size.
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Last edited by Helmuth; 6th February 2011 at 09:36 PM.
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Old 6th February 2011, 10:44 PM   #6
ScottG is offline ScottG  United States
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2 BD15's in parallel with an appropriate reflex tuning freq..

http://www.bd-design.nl/contents/en-us/d19.html

http://www.phys.tue.nl/EPG/veldhuizen/BD-15.pdf
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Old 6th February 2011, 11:35 PM   #7
Bill F. is offline Bill F.  United States
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Helmuth,

Isn't your sim in 0.5 pi space? Since your drawing does not appear to show a corner horn, better run it again in 1 pi space for a truer picture...
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Old 7th February 2011, 12:56 AM   #8
3GGG is offline 3GGG  Australia
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Thanks ScottG, I had forgotten those drivers. Two 15 is still looking like a simple way to do the bottom end and may allow a bit more room for variation with regards to bass mid horn cross over position.
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Old 7th February 2011, 12:59 AM   #9
tinitus is offline tinitus  Europe
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Calculated to work perfectly with Eminence KappaPro-12 and DeltaPro-12, but not tested
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File Type: jpg bassguitar bandpass.JPG (69.2 KB, 147 views)
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Old 7th February 2011, 01:09 AM   #10
3GGG is offline 3GGG  Australia
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Any further specs to show me tinitus? Looks interesting
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