Oh yes 
- The above was all miero's work. My own measurements of the same WG with three different drivers are below, not normalized this time (if normalized, it would all look like the miero's graph - that's the waveguide directivity alone, that doesn't change with different drivers).
- The above was all miero's work. My own measurements of the same WG with three different drivers are below, not normalized this time (if normalized, it would all look like the miero's graph - that's the waveguide directivity alone, that doesn't change with different drivers).
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Perhaps with the Faital HF1440 I could "tune" the throat plug so that it kind of compensates the fundamental resonance of that driver, which is quite low damping - Acoustic Horn Design – The Easy Way (Ath4) 
I definitely need a LE model of that driver.
I definitely need a LE model of that driver.
What kind of distortion do you mean? If it creates a lot of diffraction that causes the frequency response to depend on angle, then it's uncorrectable as a whole and as such may present audible problems. But if it only creates a reflection back to the throat without much effect on the polar response (normalized), I wouldn't consider it as harmul per se - at least it can be corrected, the same was as any other resonance within the driver itself, which is done all the time in crossover filters without any issues. Well, that's my understanding.
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The kind people at Celestion provided this information for the lumped model
Sd = 78.82cm2
Bl = 11.52Tm
Cms = 7.51e-5
Rms = 0.5
Mmd = 1.17g
Le = 0.05mH
Re = 5.6 ohms
Vtc = 38.0cm3
Atc = 78.82cm2
from the hornresp help file:
Vtc Throat chamber volume (cc).
Atc Throat chamber average cross-sectional area normal to axis (sq cm).
I think it should refer to the volume infront of the driver (a.k.a the phase plug)
So it's not the presence of the vanes that does it.
It's the shape difference between the vanes...
I have a 3D printer and a Pair of JBL 2452SL drivers.
I cannot find an ideal horn to fit in my wall.
The mouth would be surface mount
Driver exit angle is 0degrees
1.5 inch exit
Max width of horn 21 inch. It would sort of be a corner horn, so I can provide pics of the room design if it effect the product.
Target is CD and 17khz to 600/650hz crossover.
90 degrees pattern radiation.
Conical or square doesn't matter, but it cannot be significantly wider in one axis than the other
Height of horn mouth no limit (over 2m)
To reduce printing, any flat sections (if square horn obviously) can be cut from MDF and glued to 3D print.
Is there a horn I can print that fits the requirements?
I'm handy with CAD (inventor) so can draw things up if needed.
I cannot find an ideal horn to fit in my wall.
The mouth would be surface mount
Driver exit angle is 0degrees
1.5 inch exit
Max width of horn 21 inch. It would sort of be a corner horn, so I can provide pics of the room design if it effect the product.
Target is CD and 17khz to 600/650hz crossover.
90 degrees pattern radiation.
Conical or square doesn't matter, but it cannot be significantly wider in one axis than the other
Height of horn mouth no limit (over 2m)
To reduce printing, any flat sections (if square horn obviously) can be cut from MDF and glued to 3D print.
Is there a horn I can print that fits the requirements?
I'm handy with CAD (inventor) so can draw things up if needed.
I can't help with the flat panels (still on the TO-DO list) but I think you could still print it as the "base+petals" construction, which is not that resource intensive. Any shape can be divided into these parts easily, especially if you are handy with CAD.
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Back to the throat plug resonance mystery - I think it may be the extra volume of air within the channels that's actually added. By prolongating the outer channles, there is an extra volume/mass/compliance that's not there otherwise. The throat and the exit of the "plug" both stay the same but the interior is "inflated"...
So in fact, the total cross section area increases and then shrinks again. Hence the resonance (which may be a good thing after all, as it increases the efficiency where we need it the most).
So in fact, the total cross section area increases and then shrinks again. Hence the resonance (which may be a good thing after all, as it increases the efficiency where we need it the most).
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