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Old 9th September 2013, 07:29 AM   #3701
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Join Date: Jun 2007
Quote:
Originally Posted by Yauhen View Post
I tried to do it in Excel, and it was very inconvenient and time consuming, and no easy way to build frequency in a logarithmic scale.
Hi Yauhen,

I had in mind something like the attached zipped-up Excel spreadsheet.

Process:

1. Export all Hornresp chart data to csv file.
2. Open exported csv file in Excel.
3. Open attached Gain.xls file in Excel.
4. Copy data from column D in exported csv file to column B in Gain.xls.

The above process should take a matter of seconds.

Columns Gain 1 to Gain 5 in the Gain.xls spreadsheet store the different gain profiles you may have. Simply copy the one you wish to use into the relevant column H cells

To keep things simple, linear interpolation has been used to derive the gain values at intermediate points between the 14 sample frequencies.

Kind regards,

David
Attached Images
File Type: png Gain.png (82.4 KB, 263 views)
File Type: png SPL.png (82.0 KB, 265 views)
Attached Files
File Type: zip Gain.zip (48.3 KB, 7 views)
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Old 9th September 2013, 07:44 AM   #3702
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Quote:
Originally Posted by sine143 View Post
When exporting from the schematic diagram (when one wants to draw their horn out and start folding), my "width" column is represented as width/2. is there a way to stop this? does it have to do with the type of flare I'm using?
Hi sine143,

The change was made from full-width to half-width values some time ago. It is not related to the type of flare you are using. Normally horn profiles are drawn by working from the centre line axis, which makes it convenient to have half-width values specified. Simply multiply each value by 2 if you require the full width.

Kind regards,

David
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Old 9th September 2013, 05:56 PM   #3703
sine143 is offline sine143  United States
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Thanks david. Was well and properly confused wen my 620 liter offset driver horn looked like it was going to fit in a 22.5x22.5x45 inch box lol
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Old 10th September 2013, 07:14 AM   #3704
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Quote:
Originally Posted by sine143 View Post
Was well and properly confused wen my 620 liter offset driver horn looked like it was going to fit in a 22.5x22.5x45 inch box lol
:-).
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Old 24th September 2013, 11:36 AM   #3705
kees52 is offline kees52  Netherlands
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Hi David

I did try to export for a inverted tapped horn but i get again strange outcomes, can you look at it? thanks. Inverted horns have nice graphs with speakers who do not so well in tapped horns.
I have tryed all possibillities con, uni, par, exp, par go oke for a part until the end is suddenly has errors, maybe a inverted horn kan not be exported.

regards

kees
Attached Images
File Type: jpg ScreenHunter_01 Sep. 24 12.13.jpg (33.3 KB, 179 views)
File Type: jpg ScreenHunter_02 Sep. 24 12.13.jpg (70.2 KB, 179 views)
File Type: jpg ScreenHunter_03 Sep. 24 12.14.jpg (56.3 KB, 179 views)
File Type: jpg ScreenHunter_05 Sep. 24 12.15.jpg (37.1 KB, 42 views)
Attached Files
File Type: zip Export.zip (11.8 KB, 9 views)

Last edited by kees52; 24th September 2013 at 11:39 AM.
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Old 25th September 2013, 09:33 AM   #3706
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Quote:
Originally Posted by kees52 View Post
I did try to export for a inverted tapped horn but i get again strange outcomes, can you look at it?
Hi Kees,

As far as I can see, the results are being calculated correctly.

If we consider the first horn segment in your screenprint example:

S1 = 835.00
S2 = 781.22

Specified height at S1 = 32.00
Calculated width at S1 = 835.00 / 32.00 = 26.09 (Hornresp rounds to 2 decimal places)

Specified height at S2 = 32.00
Calculated width at S2 = 781.22 / 32.00 = 24.41 (Hornresp rounds to 2 decimal places)

Because the specified width flare = Con, the width of the first horn segment will decrease linearly with horn length from a half-width at S1 of 26.09 / 2 = 13.045 to a half-width at S2 of 24.41 / 2 = 12.205.

The height value at any point along the horn segment is found by dividing the cross-sectional area at that point by the width.

Calculated half-height at S1 = (835 / (2 * 13.045)) / 2 = 16.002300 (Hornresp rounds to 6 decimal places)

Calculated half-height at S2 = (781.22 / (2 * 12.205)) / 2 = 16.002048 (Hornresp rounds to 6 decimal places)

Note that in this case, height values will not be constant along the length of the horn segment because of the way that Hornresp calculates the results.

To maintain a constant 32 cm dimension along the length of the horn segment, set the width rather than the height to 32 cm, and specify either a Con or Exp width flare (but not a Uni flare) as shown in the attached screenprint.

Kind regards,

David
Attached Images
File Type: png Export.png (29.9 KB, 34 views)
Attached Files
File Type: txt test-con.txt (1.6 KB, 7 views)
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Old 25th September 2013, 09:46 AM   #3707
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Hi Kees,

The linked post is also relevant.

Hornresp

Kind regards,

David
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Old 25th September 2013, 09:53 AM   #3708
kees52 is offline kees52  Netherlands
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Location: Sprang-capelle Holland.
Hi David.


I did see when I do export some more times it has little different outcomes, but it is when I look just a very small 0,1 mm differents it looks however strange.

I do use round numbers, and so this is the result from hornresp. (see picture) a subwoofer 18 to 90 hz ready to sawdust.

I get really experienced with horn folds, I made this fold in just 40 minutes.
Attached Images
File Type: jpg inverted horn.jpg (65.0 KB, 56 views)

Last edited by kees52; 25th September 2013 at 09:55 AM.
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Old 25th September 2013, 05:53 PM   #3709
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by kees52 View Post
Hi David

I did try to export for a inverted tapped horn but i get again strange outcomes, can you look at it? thanks. Inverted horns have nice graphs with speakers who do not so well in tapped horns.
I have tryed all possibillities con, uni, par, exp, par go oke for a part until the end is suddenly has errors, maybe a inverted horn kan not be exported.

regards

kees
Kees,

In Post# 3705: The TS parameters for the Lab12 driver is not correct ?

Quote:
'Inverted horns have nice graphs with speakers who do not so well in tapped horns.'
That's your belief of what you have depicted but definitely not I can imagine. you provided a SketchUp picture that IMO depicts a Quarter-wave OD_TL.

IMO to make a good inverted Horn Sub normally takes an IB Driver (Vas very large) like the Altec 416-8B :

See the sample picture:
--------------------------------------
Inverted Horn:

Inverted Horn Loudspeaker

Voigt horn:

'...The entire pipe can be seen as a tapered transmission line in inverted form...'

Voigt pipe - Wikipedia, the free encyclopedia

http://www.greatplainsaudio.com/vint...LF_Speaker.pdf

Improve the knowledge of 'Horn' and Quarter-Wave theories:

Horn theory:

Horn Theory

https://www.grc.com/acoustics/an-int...orn-theory.pdf

http://p10hifi.net/planet10/TLS/down...rns-3parts.pdf

b
Attached Images
File Type: jpg A-TL-is-not-an-inverted-TH.JPG (432.2 KB, 54 views)
File Type: jpg Altec_416-8b.JPG (928.4 KB, 39 views)

Last edited by bjorno; 25th September 2013 at 05:59 PM.
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Old 25th September 2013, 09:16 PM   #3710
kees52 is offline kees52  Netherlands
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Location: Sprang-capelle Holland.
Bjorno

Sometimes I be on the internet and see all kind of exotic enclosures for woofers, afcourse I do not now all, and so I test them, the tapped horn can also be seen as a pipe, a real horn
it is not, but it is coupled as al the others are, a real TL is only a pipe, not coupled to te front of the speaker, I did like that idea of make a transformed to air a smatch, like the real horn does, but size matters when go low, I do like the sound of qarter wave enclosures a TL can sound very good, this technics are so very old also, and still populair.

The old post is not active anymore, the tapped horn will come later, I think i go to horns as a speaker system, but first some tryouts, the open baffle and dipoles I have done, sounds well only I miss the punch a little, and she go not very loud if use as sub.

Now the T-TQWT do play, it do well, one sub for two open baffles, go very low with the two isobaric visatons, who have by the way a very large vas, that is why i did use the isobaric to make a smaller box. see the measurement of the T-TQWT with two open baffles who do the upper bass from 100 hz. next photo is the visaton T-TQWT who is in room for some months now..

But we are on the wrong place, it is offtopic on this place.

regards

kees
Attached Images
File Type: jpg gemeten op mijn luisterplek.jpg (174.4 KB, 44 views)
File Type: jpg ScreenHunter_01 Sep. 25 22.23.jpg (114.8 KB, 51 views)

Last edited by kees52; 25th September 2013 at 09:41 PM.
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