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Old 24th December 2012, 07:37 AM   #11
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Quote:
Originally Posted by dtproff View Post
can you tell me what BVR stands for?
Big Vent Reflex.

Do a search here on replikin... that is th eBVR that yours resembles.

dave
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Old 24th December 2012, 08:21 AM   #12
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Replikon

+1 to what GM said. There is something very wrong with that posted MathCAD data.
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Old 24th December 2012, 01:36 PM   #13
dtproff is offline dtproff  United States
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Thanks guy's.

Can I post a PDF of the MLK MathCAD file I used or do I just feed you the parameters?

The plot I posed was the one called Woofer and Terminus far field response. I do not believe that one has any of the room effects in it. The room model is down at the end of the file.

Tony

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Old 24th December 2012, 02:03 PM   #14
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That makes sense that the terminus output is going to have dips and peaks as those are the characteristics of the horn and it resonances. Adding stuffing along the line and in the compression chamber helps to smooth things out if you haven't done so already. The integrated room response with driver + terminus output should be smoother. A pdf file can be uploaded or you can paste images directly.
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Old 24th December 2012, 03:17 PM   #15
GM is online now GM  United States
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Quote:
Originally Posted by dtproff View Post
Thanks guy's.
You're welcome!

Just the driver specs, horn design parameters.

GM
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Old 25th December 2012, 01:10 AM   #16
dtproff is offline dtproff  United States
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Here they are. No laughing now. I am certain I blew it in more than one spot but I promise I am trainable!

Tony
Attached Files
File Type: pdf BLH_Contours_Smouth_Corner_ Fostex FE126En.pdf (563.0 KB, 25 views)
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Old 25th December 2012, 01:13 AM   #17
dtproff is offline dtproff  United States
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I also re-entered the parameters in Hornresp and got different results. I will say the system volume in Horn response is 76L and I modeled 75.

Tony
Attached Files
File Type: pdf schematic.pdf (21.6 KB, 14 views)
File Type: pdf SPL Plot.pdf (39.7 KB, 13 views)
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Old 25th December 2012, 01:14 AM   #18
dtproff is offline dtproff  United States
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BTW... I had to change the upper throat in Hornresp from a 1" opening to 2" (and 10" wide).

Tony
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Old 25th December 2012, 01:56 AM   #19
GM is online now GM  United States
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As I suspicioned, the driver specs are somewhat whacked, especially Fs.

Fs = 83 Hz
Qes = 0.33, which should auto calculate a higher Qts
Vas = ~7.9115 L based on Fs, Sd, Mms
BL = ~5.6444 based on Fs, Mms, Re, Qes

In HR, it should look like this, which is fractionally different due to more rounding off, but acoustically inconsequential:

GM
Attached Images
File Type: gif FE126En corrected specs [Hornresp].gif (18.8 KB, 115 views)
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Old 25th December 2012, 02:03 AM   #20
dtproff is offline dtproff  United States
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Quote:
Originally Posted by GM View Post
As I suspicioned, the driver specs are somewhat whacked, especially Fs.

Fs = 83 Hz
Qes = 0.33, which should auto calculate a higher Qts
Vas = ~7.9115 L based on Fs, Sd, Mms
BL = ~5.6444 based on Fs, Mms, Re, Qes

In HR, it should look like this, which is fractionally different due to more rounding off, but acoustically inconsequential:

GM
Thanks... I'll go back and rework things.

I appreciate it.

BTW...

I appreciate you taking the time to respond. If I just replicate what others have done I don't learn.

Again... I appreciate your help.

Tony
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