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Old 30th December 2012, 05:29 AM   #11
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Quote:
Originally Posted by head_unit View Post
However, we don't all have Hornresp.
Hi head_unit,

That's no excuse :-).

The program can be downloaded free of charge from Hornresp. It works on all Microsoft Windows operating systems. The current Setup.exe file is a little over 1MB in size.

Hornresp can also simulate direct radiator loudspeakers, not just horn-loaded systems.

Kind regards,

David
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Old 30th December 2012, 12:05 PM   #12
more10 is offline more10  Sweden
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If you hav a Mac you can run it in VmWare Fusion. If you got Linux you can probably run it in Wine. So there is absolutely no excuse!
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Old 31st December 2012, 01:15 PM   #13
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I don't think bass horns couple below 200hz.

take a eaw kf940.
http://www.eaw.com/products/KF940.html
http://www.eaw.com/info/EAW/Loudspea...SPECS_revA.pdf
dual 12" bent bass horn.
13' long path, maybe 3-4ft2 of mouth.
This is their graph on their pdf sheet, not a simulation.
Notice how 4 boxes couple well at 200hz but not at all down around 30hz.

Click the image to open in full size.

but you can boost the low end.
And 8 drivers (4 boxes) will handle 10db of boost better than 2 drivers.

Last edited by norman bates; 31st December 2012 at 01:20 PM.
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Old 31st December 2012, 05:44 PM   #14
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Quote:
Originally Posted by norman bates View Post
I don't think bass horns couple below 200hz.

take a eaw kf940.

dual 12" bent bass horn.
13' long path, maybe 3-4ft2 of mouth.
This is their graph on their pdf sheet, not a simulation.
Notice how 4 boxes couple well at 200hz but not at all down around 30hz.

but you can boost the low end.
And 8 drivers (4 boxes) will handle 10db of boost better than 2 drivers.
Norman,

Rest assured, bass horns do indeed couple below 200 Hz.
Also, 10 dB of boost is exactly the same with 2 drivers or 8, multiple voice coils just make a bigger fire.

The increase in upper level of the EAW KF940 "unprocessed" chart is due to the increased upper directivity focusing more output level in front of the multiple cabinet array when compared to a single, while the mostly omnidirectional low bass has very little DI increase, and therefore relatively less gain in multiples.
The response of the low bass looks like it has hardly increased (about 1 dB at 30 Hz compared to about 4 dB at 100 Hz) because the drive voltage has been reduced in the multiple cabinet chart.

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Old 31st December 2012, 06:40 PM   #15
jogi59 is offline jogi59  Germany
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Quote:
Originally Posted by norman bates View Post
I don't think bass horns couple below 200hz.
They do.
I don´t know, what EAW measured, but here is a measurement from the german "Production Partner"
Click the image to open in full size.
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Old 1st January 2013, 01:21 AM   #16
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Quote:
Originally Posted by David McBean View Post
Hi head_unit,

That's no excuse :-).

The program can be downloaded free of charge from Hornresp. It works on all Microsoft Windows operating systems. The current Setup.exe file is a little over 1MB in size.

Hornresp can also simulate direct radiator loudspeakers, not just horn-loaded systems.

Kind regards,

David
When are we gonna get Hornresp for Mac?
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Old 1st January 2013, 05:08 AM   #17
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Quote:
Originally Posted by dustman96 View Post
When are we gonna get Hornresp for Mac?
Hi Dusty,

That's an easy one - never :-). I understand some Mac users have bought cheap second-hand PCs just so that they can run Hornresp...

Kind regards,

David
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Old 1st January 2013, 05:17 AM   #18
Djim is offline Djim  Netherlands
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Location: 'Ollanda
Quote:
Originally Posted by norman bates View Post
I don't think bass horns couple below 200hz.

take a eaw kf940.
EAW: KF940
http://www.eaw.com/info/EAW/Loudspea...SPECS_revA.pdf
dual 12" bent bass horn.
13' long path, maybe 3-4ft2 of mouth.
This is their graph on their pdf sheet, not a simulation.
Notice how 4 boxes couple well at 200hz but not at all down around 30hz.

Click the image to open in full size.

but you can boost the low end.
And 8 drivers (4 boxes) will handle 10db of boost better than 2 drivers.
Hi norman bates,

The coupling of multiple basshorns in a free field is determined by the sum of the mouths areas and their 1/4 wavelength.

In case of the KF940 the horn-mouth area is much smaller than its ¼ wavelength diameter. Actually, the mouth area is scaled down in a ratio of approx 16:1.
In other words, the KF940 is designed in such way that you will need 16 cabs (4 by 4 setup) to get a full coupling (horizontal and vertical) over the full bandwidth of the KF940.

The measurement is of an 2 by 2 stack which represents about a quarter of the area needed to get coupling over the full bandwidth. Therefore full coupling happens about 4 times higher somewhere around 120Hz as shown in the unprocessed frequency response.
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Old 1st January 2013, 01:00 PM   #19
djk is offline djk
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Location: USA
I see the processor applies what looks to be about 12dB of boost around 32hz to meet the performance claims.

The Di plot is instructive as well, it follows the unprocessed frequency response exactly (as it should).

The mouth (including the flat surface) is 36x32.
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Old 1st January 2013, 07:25 PM   #20
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by djk View Post
The Di plot is instructive as well, it follows the unprocessed frequency response exactly (as it should).
If you lift the green line (red line) until "they follow", you will see it begins around the 120Hz...

Click the image to open in full size.
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