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Old 30th October 2012, 12:47 AM   #181
tb46 is offline tb46  United States
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Default Post #179

Hi Samuel Jayaraj,

I took my drawing of Don's LAB12 TH design, and stretched it into a single fold, then I chopped it off to 96", and readjusted the parts to fit with a single taper. This should get you started.

Regards,
Attached Images
File Type: jpg LAB12_single_fold_Input.jpg (35.1 KB, 400 views)
File Type: jpg LAB12_single_fold_SPL.jpg (30.9 KB, 394 views)
Attached Files
File Type: pdf LAB12_single_fold_new_2012_Oct29.pdf (33.4 KB, 146 views)
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Last edited by tb46; 30th October 2012 at 12:51 AM.
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Old 30th October 2012, 03:53 AM   #182
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Thank you very much Oliver for taking time off and putting in the extra effort to do the sims , drawings and sheet cuts. So this will take 2 sheets and will still require the PE Inductor. -3db may be around 23Hz but this also seems to take the max SPL up by a couple of decibels. Any comments? Thank you, once again.
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Old 30th October 2012, 09:40 AM   #183
AndrewT is offline AndrewT  Scotland
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Why do so many builders simulate by selecting parabolic for the expansion?

Do some of them also think that par = parallel?
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Old 30th October 2012, 01:04 PM   #184
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by AndrewT View Post
Why do so many builders simulate by selecting parabolic for the expansion?

Do some of them also think that par = parallel?
Quote:
Just to clarify, if a rectangular cross-section horn segment has two parallel straight walls and two non-parallel straight walls, then the actual area expansion will be parabolic not conical. It is therefore more accurate to specify Par rather than Con in this case.

Kind regards,

David
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Old 30th October 2012, 02:36 PM   #185
tb46 is offline tb46  United States
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Hi Samuel Jayaraj,

Post #182: "...Any comments?..."

I think you got it, and yes, it will still need the inductor. This may be a nice alternative for people looking for a different form factor. It's also an even easier build.

Regards,
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Old 30th October 2012, 04:30 PM   #186
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Quote:
Originally Posted by tb46 View Post
SNIP....

I think you got it, and yes, it will still need the inductor. This may be a nice alternative for people looking for a different form factor. It's also an even easier build.

Regards,
It also looks like the single fold has a wider passband and flatter frequency response.
.
Although I suspect that allot of the "clutter" and wild swings in frequency response that Hrsp. shows (in the SPL graphs) in reality get damped out either mechanically or by damping material physically added to the transmission line.
.
Single fold shown in bold, multiple fold shown in backround, both @ 100W (20.71 V) and 1.0 Pi

Dave
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File Type: jpg Lab 12 TH.jpg (85.4 KB, 369 views)
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Last edited by Shadydave; 30th October 2012 at 04:35 PM. Reason: added info
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Old 30th October 2012, 05:07 PM   #187
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Thanks again Oliver. Oliver and everyone else, any details of the stuffing? Thanks in advance.
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Old 30th October 2012, 06:44 PM   #188
tb46 is offline tb46  United States
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Hi again,

Generally, stuffing does not seem to be necessary, but if you use it keep it light. See: Dual 8" tapped horn = TH-SPUD for additional information.

I added a note on stuffing to the drawing.

Regards,
Attached Files
File Type: pdf LAB12_single_fold_new_2012_Oct29.pdf (46.9 KB, 127 views)
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Old 31st October 2012, 05:46 AM   #189
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Thanks again Oliver.
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Old 31st October 2012, 08:48 AM   #190
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Hi DrDyna,

Just for the record - the comment of mine quoted in your post #184 is partially incorrect :-).

Please see my post Lab12 - Tapped Horn - and the subsequent further clarifying explanations to AndrewT.

Kind regards,

David
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