Could you or someone explain this further?
3GGG obviously did ask the simulator and it gave the result shown.
Why is that unrealistic? Or I can rephase that: Why is the question asked by 3GGG giving a prediction that is misleading?
Can it ever be realistic.
Why should it be simulated "off axis"?
What is that telling us? In other what is the question we are asking the simulator to give us a prediction for.
It comes back to understanding the mechanism at play before formulating the question/s !!!!
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I thought about that and figured, of course, the backwave due to the incomplete mouth termination...but, I am not sure whether hornresp sims this?
Hey 3GGG,
Funny you use constant directivity now😉. Go back and see your correct/more relevant sims at the beginning of this thread, covering from 0 to 20 degrees offaxis.
Funny you use constant directivity now😉. Go back and see your correct/more relevant sims at the beginning of this thread, covering from 0 to 20 degrees offaxis.
I put this project on the shelf whilst building up a pair of Aleph J's and a pumpkin pre. I remember now how to get the correct sim, must be the third time you have told me.
The tractrix really looks like a superior option, the conical would be easier to build. Not sure if i like the look of the square tractrix.
Hey,
If you place the Tx on the floor you can shrink it a little. Also note a square 130Hz Tx is 68cm wide, while the round is 76cm if we use HR.
If you place the Tx on the floor you can shrink it a little. Also note a square 130Hz Tx is 68cm wide, while the round is 76cm if we use HR.
Attachments
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Has anyone designed and or built a Le Cleach horn where it stops at 90 degrees, similar to tractrix? How would I sim this on hornresp?
The big size reduction bould obviously be the main benefit.
I only need the Fane 8M do 120 hz to around 500 or 600hz and was thinking a reduced LeCleach may integrate better with the LeCleach above which will have the Yamaha 6681 driver on it.
The big size reduction bould obviously be the main benefit.
I only need the Fane 8M do 120 hz to around 500 or 600hz and was thinking a reduced LeCleach may integrate better with the LeCleach above which will have the Yamaha 6681 driver on it.
You can search for Kugelwellen or Spherical horns as these are close to equal to LeCleach with T=1. Sim these by choosing S instead of T.
If you use LeCleach just choose Calculate S2 and Fta=90 in the Wizard. Will be bigger than an a Tractrix. You can use a higher F12 to get the same lowend response though.
If you use LeCleach just choose Calculate S2 and Fta=90 in the Wizard. Will be bigger than an a Tractrix. You can use a higher F12 to get the same lowend response though.
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Sorry to interrupt you guys...
I have an altec 416-8A which i want to put in a midbass horn. I have managed to get a decent frequency respons in hornresp but i have some questions to the audio elite 🙂
1. How do I get rid of the bumps in the curve? Are the really audiable?
2. Will this horn be able to be cut at 500Hz(jbl 2441 trac) and 100Hz (tapped B&C) or is the response to narrow?
Regards
Marcus
I have an altec 416-8A which i want to put in a midbass horn. I have managed to get a decent frequency respons in hornresp but i have some questions to the audio elite 🙂
1. How do I get rid of the bumps in the curve? Are the really audiable?
2. Will this horn be able to be cut at 500Hz(jbl 2441 trac) and 100Hz (tapped B&C) or is the response to narrow?
Regards
Marcus
Is 2Pi loading appropriate for an upper bass lower mid horn?
Or will it be boundary free over much or most of it's frequency range?
Or will it be boundary free over much or most of it's frequency range?
Andrew,
I would like to know that aswell. If freespace is the case in round midbass horns then my above simulation is faulty. If I run the simulation 4 x pi the response isnt very nice, although if I run the simulation 1 x pi it becomes more even.
It would be nice to know which one to use for round midbass horns. physically they arent very close to either the wall or the ground.
Regards
Marcus
I would like to know that aswell. If freespace is the case in round midbass horns then my above simulation is faulty. If I run the simulation 4 x pi the response isnt very nice, although if I run the simulation 1 x pi it becomes more even.
It would be nice to know which one to use for round midbass horns. physically they arent very close to either the wall or the ground.
Regards
Marcus
Removing front throat chamber volume by using a phase plug will increase dynamics and attack. It is quite noticeable when doing A/B comparisons. If the circumference of the mouth is equal to or longer than Fc, then mouth additions have virtually no effect. However, if your horn mouth is under sized, mouth additions like round overs can help with throat reflections and higher order modes (HOMs).
I added a phase plug. The baffle already had the right throat size so I enlarged that and brought the horn back to the driver with a better entry angle. The plug has one ring and one concave plug. I've since spent the last week with an overly small rear chamber, and then tuned the electrical impedance.
It's laid back and out there at the same time. The sound of a hand striking the soundboard of a guitar has a certain 'thereness' that most speakers cannot reproduce well. Some say that mid/bass horns have this distortion 'feature', but I'm not so sure. How close might this phase plug be to the point of diminishing returns?
It's laid back and out there at the same time. The sound of a hand striking the soundboard of a guitar has a certain 'thereness' that most speakers cannot reproduce well. Some say that mid/bass horns have this distortion 'feature', but I'm not so sure. How close might this phase plug be to the point of diminishing returns?
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Depends on the wavelengths involved. If the highest frequency of interest has a wavelength that is acoustically large compared to the dimensions of the phase plug, then you have already reached the point of diminishing returns.
You can get closer (literally):
1) To minimize [Vf] and extend upper frequency bound, make plug surface follow closely diaphragm contour offset by 2*[xmax]
2) To improve efficiency make [St] smaller so as to set compression ratio [Sd]/[St] = 5
3) To smooth frequency response, place dual rings at first and second standing wave nodes of the front cavity.
For examples see [1] and for design see [2] below
Regards,
WHG
References:
[1] Phase Plugs
[2] http://www.diyaudio.com/forums/multi-way/3301-phase-plug-question.html#post28203
1) To minimize [Vf] and extend upper frequency bound, make plug surface follow closely diaphragm contour offset by 2*[xmax]
2) To improve efficiency make [St] smaller so as to set compression ratio [Sd]/[St] = 5
3) To smooth frequency response, place dual rings at first and second standing wave nodes of the front cavity.
For examples see [1] and for design see [2] below
Regards,
WHG
References:
[1] Phase Plugs
[2] http://www.diyaudio.com/forums/multi-way/3301-phase-plug-question.html#post28203
Thanks John. Yes it is. The difference with the phase plug doesn't measure to much, but I think it was what I was looking for. I've decided to learn a little about them in general.
WHG, I found your first link very useful.
WHG, I found your first link very useful.
I am building GOTO s150 horns. Maybe I can use the same horn shape for 6m110 and the JA6681B. The Beyma would reach 150Hz-400Hz, and the Yamaha 300Hz-12kHz. I was planning to wait until my clone of the Avantgarde Trio's biggest midbass horn is ready, but this could work as well. May very well be better since the dispersion is the same. I guess a bigger horn for the Beyma would be better, but my space is limited.
They would be followed by a JBL sub, and ribbon tweeters.
This I have to try.
They would be followed by a JBL sub, and ribbon tweeters.
This I have to try.
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Hi all,
I bought a Beyma 6Mi100. I see that over years the specs for this speaker changed a little.
LOW & MID FREQUENCY 6MI100 | Beyma
Please recommend a suitable Fc for a full size mouth tractrix horn.
I plan to use it in 200Hz-2.2kHz without (if possible) phase plug.
Mouth will be 1.6:1 rectangular.
At the moment I am listening to a 220Hz Fc tractrix loaded with 3.5" cone driver. I want to go lower, hornloaded... 🙂
I bought a Beyma 6Mi100. I see that over years the specs for this speaker changed a little.
LOW & MID FREQUENCY 6MI100 | Beyma
Please recommend a suitable Fc for a full size mouth tractrix horn.
I plan to use it in 200Hz-2.2kHz without (if possible) phase plug.
Mouth will be 1.6:1 rectangular.
At the moment I am listening to a 220Hz Fc tractrix loaded with 3.5" cone driver. I want to go lower, hornloaded... 🙂
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