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Old 16th July 2011, 03:49 PM   #2001
GM is offline GM  United States
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Using the mean distance [acoustic center] of the driver line has proven close enough to actual measurements using MJK's MathCad software, so I see no reason why HR would be any different.

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Old 16th July 2011, 04:01 PM   #2002
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Quote:
Originally Posted by blo06 View Post
Hi Everyone,

I'm beginning with Hornresp, trying different things.

When simulating a Bass Reflex and comparing the result with WinISD's (to be sure I'm doing ok), I don't get the same response... Could you tell me why ?

I model the same box with the same vent and get two different Helmoltz freq and two different response curves...

In HR, I did it with the Loudspeaker Wizard (wonderful feature by the way !!)

Perhaps all of this is already explain in this tread, but there's # 2000 messages ! If so tell me where !

Regards.
I guess that what you are missing is that hornresp initially shows the output from the driver, without the output from the port.
To see the overall system response you need to select the combined response from the tools menu in the SPL window.
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File Type: jpg combined.jpg (87.5 KB, 233 views)
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Old 16th July 2011, 07:28 PM   #2003
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by mashaffer View Post
What I am looking at is a quarter wave pipe (TL) with several identical drivers distributed along a portion of the pipe, not for smoothing necessarily but for convenience sake. I realize that HR can not simulate this directly (nor would it be reasonable to rewrite it to handle it) but what I am wondering is if one could not get a close enough approximation of the total response by simulating each position and averaging the results.
You've stuck an idea in my head:
What if Hornresp could crunch the numbers of multiple records? That is to say that if you created a file for each position along the path where a driver is located. It would also be interesting if you could use another mode of the multiple record technique for comparison. I think it would a need a check box to indicate if you wanted to sum or compare them and a row of buttons to load files that would allow you to also pick a color for the graph output...
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Old 17th July 2011, 03:04 PM   #2004
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Quote:
Originally Posted by NEO Dan View Post
...You've stuck an idea in my head:
What if Hornresp could crunch the numbers of multiple records? ...
Hi,

Why not DIY. ..There are endless use if taking advantage of HR's export files.

Here is an example:

b
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File Type: jpg 4xKefB110B_SP1057_multi-OD-TL.JPG (606.8 KB, 218 views)
File Type: jpg 2-plus-2xKefB110B-sum.JPG (812.0 KB, 214 views)
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Old 17th July 2011, 06:50 PM   #2005
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Quote:
Originally Posted by bjorno View Post
Hi,
Why not DIY.
Hi bjorno,
That's quite the undertaking, but I do wonder if hornresp could do a better job than HOLM? I was thinkning of this as a logical alternative to giving Hornresp a workover to make it aware of multiple driver locations in one record.
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Old 17th July 2011, 07:58 PM   #2006
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Quote:
Originally Posted by Xoc1 View Post
I guess that what you are missing is that hornresp initially shows the output from the driver, without the output from the port.
To see the overall system response you need to select the combined response from the tools menu in the SPL window.

Hi Xoc1,

I'm taking about the combined response. It doesn't look like the WinISD's.

For the close box, it's close but not the same, for the BR it's sometimes far away, specially for the low part.

Regards.
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Old 18th July 2011, 07:48 AM   #2007
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Originally Posted by blo06 View Post
I'm taking about the combined response. It doesn't look like the WinISD's. For the close box, it's close but not the same, for the BR it's sometimes far away, specially for the low part.
Hi blo06,

Can you please post a screenprint of your Hornresp input parameters window, and also provide details of the WinISD Driver, Box and Vent values you are using for the purposes of the comparison. Thanks.

Kind regards,

David
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Old 18th July 2011, 09:20 AM   #2008
blo06 is offline blo06  France
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Quote:
Originally Posted by David McBean View Post
Hi blo06,

Can you please post a screenprint of your Hornresp input parameters window, and also provide details of the WinISD Driver, Box and Vent values you are using for the purposes of the comparison. Thanks.

Kind regards,

David
Hi David,

here they are.


Regards.
Attached Images
File Type: jpg HR200 in.jpg (65.6 KB, 159 views)
File Type: jpg HR200 LW Schem.jpg (37.6 KB, 152 views)
File Type: jpg HR200 LW SPL.jpg (49.1 KB, 49 views)
File Type: jpg WIN200 1.jpg (92.0 KB, 54 views)
File Type: jpg WIN200 2.jpg (21.1 KB, 52 views)
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Old 18th July 2011, 10:01 AM   #2009
Xoc1 is offline Xoc1  United Kingdom
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blo06
Your AP figure is incorrect.
The AP Parameter is the cross sectional area of the port.
For a 10.2cm diameter round port this would be radius squared X pi = 81.71 sq cm.
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Old 18th July 2011, 10:47 AM   #2010
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Quote:
Originally Posted by Xoc1 View Post
blo06
Your AP figure is incorrect.
The AP Parameter is the cross sectional area of the port.
For a 10.2cm diameter round port this would be radius squared X pi = 81.71 sq cm.
I saw that too but more important is that the T/S parameters are way off.
Reason for this is probably from the advertised Cms value that is not consistent compared to other driver data.

b
Attached Images
File Type: gif Monacor-SP200X-ported.GIF (111.8 KB, 51 views)

Last edited by bjorno; 18th July 2011 at 10:55 AM. Reason: picture faults
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