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Old 3rd May 2010, 07:58 PM   #1
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Default 15" + Mid + Horn

The bass drivers I will use will be C15-400B. PDF
Searching for a horn, I came across with CP 800TI from Beyma which has low 2nd and 3rd order harmonics for a compression driver. PDF
But it has the SPL value to high (for 1W). A L-pad will help but with some disadvantages.

The horn used in Beymas test is TD590. PDF
The polar response is not so great.

Next step.

As you can see from the graphs at 5W the C15 will have over 100dB at 50Hz.
It will be a problem matching this with a good mid driver.

The possibility of 15" + 2" driver will work only if I find one suitable for the job.

The test enclosure is 110 L, FB 45Hz, 20% Damping (40kg/m3). Full space simulation (anechoic).
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Old 3rd May 2010, 08:09 PM   #2
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Have a look at this page for some 8" and 10" drivers to complement.

http://www.parts-express.com/wizards...AT&srchCat=579
http://www.parts-express.com/wizards...AT&srchCat=580

I don't think you'll have to worry about 100dB 1 watt at 50 Hz. Take a look at the graph they post on your linked page. I see 93 - 94 like your graph on the left shows.
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Old 3rd May 2010, 08:24 PM   #3
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The response in the PDF file is in Free Air.

From Leaps graph I find the following:
150 @ 97dB
200 @ 98.5dB

above 200Hz the SPL increases slightly to about 100dB.

This are also in Free Air.

Delta Pro 8 might work. Breakup range starts at rougly 3Khz.
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Old 3rd May 2010, 10:18 PM   #4
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Free air or IB?
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Old 4th May 2010, 06:34 AM   #5
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Free air.
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Old 4th May 2010, 06:46 AM   #6
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Quote:
Originally Posted by Cal Weldon View Post
Free air or IB?
Yeah, I don't believe it either.
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Old 4th May 2010, 06:47 AM   #7
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The graphs cant be correct. Based on the T/S parameters, I find that free air (4pi) sensitivity of the woofer is just 89,65 dB. At 5W that is not more than 96,6 dB.
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Old 4th May 2010, 07:28 AM   #8
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Re-running.

I know that graphs are inaccurate and that`s why I will build a test box to assess it.

Later:

Same result. The box was rectangular due to laziness.

P.S.

Attached graphs from LEAP database.
First one is free air, second inf baffle.
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File Type: jpg mortiiremake5w.JPG (241.0 KB, 89 views)
File Type: jpg Capture2.JPG (158.5 KB, 85 views)
File Type: jpg Capture3.JPG (159.0 KB, 16 views)

Last edited by Predator864; 4th May 2010 at 07:40 AM.
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