I would like to build a pair of H-93 2" short horns , would anyone have a drawing of these.
It would seem like its a straight forward design.
thanks
I would like to build a pair of H-93 2" short horns , would anyone have a drawing of these.
It would seem like its a straight forward design.
thanks
if it not to easy to find , then it would be easy to make if I could get a drawing
can anyone help me out
I have a pair, what dimensional resolution do you want?
If we knew what the hell we were doing, we wouldn't call it research would we.
Originally Posted by 1audiohack
we know the throat dia. 2" I guess I just need the throat length from flange to mouth and mouth dia
If I am correct the horn is a straight tapper correct ?
It is not a straight taper (conical). It is an exponential horn. It is also very short,
but it is a continuation of the taper starting in the driver's throat. I posted a graphic
showing the diameter vs length here somewhere... (I'll have a look).
Ah here (wrapped up in a 1.5" DIY effort):
http://www.audioheritage.org/vbullet...l=1#post185774
The pair I have that measure on average 1.925" at the throat entry and 3.875" at the mouth.They are 4.610 overall length.
The expansion of one wall is as follows moving up from the bottom of the throat in one tenth of an inch increments:
Y axis...Z axis
0.100 = 0.010
0.200 = 0.015
0.300 = 0.022
0.400 = 0.030
0.500 = 0.038
0.600 = 0.048
0.700 = 0.058
0.800 = 0.069
0.900 = 0.080
1.000 = 0.094
1.100 = 0.107
1.200 = 0.122
1.300 = 0.137
1.400 = 0.152
1.500 = 0.169
1.600 = 0.187
1.700 = 0.205
1.800 = 0.224
1.900 = 0.244
2.000 = 0.264
2,100 = 0.286
2.200 = 0.307
2.300 = 0.329
2.400 = 0.350
2.500 = 0.373
2.600 = 0.396
2.700 = 0.421
2.800 = 0.444
2.900 = 0.468
3.000 = 0.489
3.100 = 0.515
3.200 = 0.539
3.300 = 0.564
3.400 = 0.590
3.500 = 0.614
3.600 = 0.643
3.700 = 0.670
3.800 = 0.698
3.900 = 0.728
4.000 = 0.757
4.100 = 0.790
4.200 = 0.825
4.300 = 0.863
4.400 = 0.900
4.500 = 0.943
4.575 = 0.975
So in the end 1.925 + 0,975 + 0.975 = 3.875" The begin / end descrepancy in the Z axis is the ball diameter of the probe.
Hope that helps,
Barry.
If we knew what the hell we were doing, we wouldn't call it research would we.
It would appear that the H93 alias the 2311 is a hyperbolic and not an exponential horn.
Given a 4.61" (117.1 mm) long horn with a throat diameter of 1.925" (48.9 mm) and a mouth diameter of 3.875" (98.4 mm):
The radius in mm of such an exponential horn as a function of the distance from the throat is given by
exp( 0.0059748552 * x + 3.1965279612)
and plotted in black.
The red curves are interpolations of 1audiohack's data.
The hyperbolic horn best fitting 1audiohack's data is given by
sqrt( 1877.6679 * (cosh( 0.0151278 * x) + 0.36 * sinh( 0.0151278 * x)) / pi)
and plotted in green.
All measurements in the graph are in mm.
The red lines are probably the most helpful. Clear that it is not a conical 'taper' which
should help the OP.
It may have been considered, but recall that for the equation, the flare start is well
into the throat of the driver, starting at closer to 1.5" -diameter-, which is what I think
was meant above, vs radius.
[QUOTE=1audiohack;322186]The pair I have that measure on average 1.925" at the throat entry and 3.875" at the mouth.They are 4.610 overall length.
The expansion of one wall is as follows moving up from the bottom of the throat in one tenth of an inch increments:
Thanks thats what Ali was looking for ] maybe what I need to do is find a single horn and make a silicone mold and cast some ?
I guess you could, are they finally getting hard to find? Sounds like a lathe project to me.
Shooting from the hip I would say we could write a program for something as simple as these in about an hour and drop one out of the lathe every 10-12 minutes. Our lathe does not have live tooling so we would have to move them to the mill for the drilled and tapped holes, probably another 10 minute cycle time.
If we knew what the hell we were doing, we wouldn't call it research would we.
Yep... but probably only for the hobbyist. I can't imagine that it would be possible to get the raw material cost for them much less the labor.
I haven't priced them in years, but with patience they must still pop up from time to time at a good price. Currently Jammin Jersey has 5 H93s in stock at $150 ea.
Widget
Looks like $42.00 each for material (6061 T6 extruded round) and less than 40 minute total cycle time. With CAD and CAM included we could make six at $100 each and not lose. Since they are not JBL though I don't know if anyone would buy them, at $150 I would run them all day!
If we knew what the hell we were doing, we wouldn't call it research would we.
May be very similar "SELENIUM HL 14-50" can be used (off course depending of its purpose)
http://www.lautsprechershop.de/pdf/s...um_hl14_50.pdf
http://www.jblselenium.com.br/site/a..._pdfManual.pdf
http://www.jblselenium.com.br/site/a..._pdfManual.pdf
which is priced about 25$ per piece.
http://www.amazon.com/Selenium-HL14-.../dp/B000MMXA1M
It is aluminum exponential-short-horn, but I expect that can be used with JBL 2" drivers.
As the original one it has relatively narrow ("beaming") polar response
I know that it is not JBL, and its mouth is larger then H93 (2311), and concerning the fixing holes for JBL244x drivers, the holes on HL14-50 has to be "rasped" towards center because JBL diameter hole distance is about 99mm, and on the HD14-50 horn the distance is 102mm, but if it is "masked" with 2308 'lenses", may can be used.
Yes, have used these for some years, have done considerable comparison with H93 as well as Stereo Labs tractrix of similar size. Do a nice job in my 4-way rig 1200 - 10K. But, it is all personal preference, application and development. No magic. I'd listen to a lot of horns before I launched a production project! Mike
Just for my curiosity: Have you tried Selenium HL 14-50 with JBL 'slant lenses' 2308. working together...
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