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Old 16th August 2011, 06:11 AM   #2131
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Default Bug Fix

Hi Everyone,

I found a bug in the Y-axis scaling of the new charts when plotting certain small values. The first screenprint shows the incorrect scaling caused by the bug (insufficient resolution giving multiple instances of the same value). The second screenprint shows the correct scaling when the bug is removed.

The latest release is Product Number 2870-110816.

Kind regards,

David
Attached Images
File Type: png Bug.png (22.4 KB, 138 views)
File Type: png Fixed.png (22.5 KB, 139 views)
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Old 16th August 2011, 06:36 AM   #2132
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Quote:
Originally Posted by David McBean View Post
The latest release is Product Number 2870-110816.
These new versions are coming out so quickly - perhaps it's time for an auto-update feature for HornResp
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Old 16th August 2011, 06:47 AM   #2133
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Hi dirkwright,

Quote:
Originally Posted by dirkwright View Post
Why doesn't the schematic show the horn ending in a 90 degree flare?
Because with your design, the mouth is severely truncated, as indicated earlier :-).

Using your values of S1 = 167.80 sq cm and F12 = 60.04 Hz, a fully formed tractrix horn would have a length L12 of 202.31 cm and a mouth area S2 of 26123.15 sq cm. See the attached screenprint.

Kind regards,

David
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File Type: png Tractrix.png (17.4 KB, 134 views)
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Old 16th August 2011, 07:03 AM   #2134
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Quote:
Originally Posted by mwmkravchenko View Post
Uni is a horn where you set up Hornresp to make a horn having two parallel side walls and the rest changes.
Hi Mark,

Just to clarify - the 'Uni' width flare option uniformly transforms the horn rectangular cross-section area aspect ratio from the throat to the mouth. The horn will have two parallel side walls only if the S1 and S2 height values are specified to be the same.

Kind regards,

David
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Old 16th August 2011, 07:43 AM   #2135
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Quote:
Originally Posted by dirkwright View Post
Are you saying that tractrix are only good if they are full sized horns? Why would that be the case?
Hi dirkwright,

The throat acoustical impedance of a fully formed tractrix horn will be "smoother" than that of a truncated one because of the better matching conditions at the horn mouth - there is less of a discontinuity as the wavefronts leave the horn.

The first screenprint shows the predicted normalised throat impedance of your design (radiating into 1 Pi space). The second screenprint shows the predicted normalised throat impedance of a full-mouth 90 degree tractrix horn having the same S1 and F12 values as your design (radiating into 1 Pi space).

Kind regards,

David
Attached Images
File Type: png Throat1.png (27.2 KB, 117 views)
File Type: png Throat2.png (25.6 KB, 117 views)
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Old 16th August 2011, 07:50 AM   #2136
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Quote:
Originally Posted by dirkwright View Post
I don't understand what you mean by parallel and series connected drivers. Do you mean electrically or acoustically?
Hi dirkwright,

Electrically.

Kind regards,

David
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Old 16th August 2011, 09:43 AM   #2137
Kenel is offline Kenel  France
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Hi everyone,
first post and maybe not at the right place?
After a build of 2 Folded Horns with 15'' drivers designed with HORNRESP (which sound great & thanks so much David...), I hope some of you can help me to correct my new design of 18'' Rear Loaded Horn.
Actually it's a bit hard to find explanations on using Hornresp to calculate this kind of horns and as I'm planing to build 4 bins like that - the budget makes me wonder if everything is right... That's why I'm posting this here... Let me know if I should create a new post?

Any comment will be highly appreciated

HORNRESP PARAMETERS (for a stack of 4 bins in parallel / PD186 drivers)
Click the image to open in full size.

WHAT IT LOOKS LIKE
Click the image to open in full size.

Many thanks
Olive

Last edited by Kenel; 16th August 2011 at 09:55 AM.
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Old 16th August 2011, 09:53 AM   #2138
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Welcome to diyAudio Olive! I think you have chosen the right place .

edit: woops, the post didn't approve and in the meantime I went and got dinner. Welcome again!

Tony.
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Last edited by wintermute; 16th August 2011 at 10:11 AM. Reason: woops
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Old 16th August 2011, 12:14 PM   #2139
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Quote:
Originally Posted by David McBean View Post
Hi dirkwright,



Because with your design, the mouth is severely truncated, as indicated earlier :-).

Using your values of S1 = 167.80 sq cm and F12 = 60.04 Hz, a fully formed tractrix horn would have a length L12 of 202.31 cm and a mouth area S2 of 26123.15 sq cm. See the attached screenprint.

Kind regards,

David
Thanks. Two meters is way too long for a straight horn in my house! Is it possible to simulate a folded horn in your program? I seem to be stuck here with needing a horn that goes up to 500Hz and as low as possible. I guess 100Hz is much more reasonable for the lower cutoff. A 1/2 size hyp-ex is 1 meter long.

Last edited by dirkwright; 16th August 2011 at 12:33 PM.
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Old 16th August 2011, 03:11 PM   #2140
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Quote:
Originally Posted by Kolbrek View Post

Regarding reactance anulling, the idea is to make the negative reactance of the rear chamber equal to the positive mass reactance of the horn. This way they largely cancel, and the load seen by the driver is mainly resistive in the working range. It is first described by A.L. Thuras in US patent # 2037185.

Bjørn
OK, what is the advantage of having the driver see a resistive load? Does it increase efficiency or something? Do direct radiator type of loudspeakers see a resistive load in the free air? Why can't the resonant impedance peak be removed by a notch filter? I have not read the patent but I can do that today.
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