Many thanks Mr.Widget.
GuidoOriginally Posted by ivica
It would be helpful if You know where "H9800 CAD" can be find.
Regards
Ivica
You guys are really lazy
http://www.audioheritage.org/vbullet...-Data&p=232914
Sorry Guido, anyhow thanks for the upper link, but still remains: "some more mechanical dimensions, You have finally apply" for 2-inch driver.
I do not think that 'scaling' is the only thing.
Regards
Ivica
from some early Jan's posts: http://www.audioheritage.org/vbullet...l=1#post180832 is seems to me that some dimensions can be seen, and from Guido's photos http://www.audioheritage.org/vbullet...l=1#post327827 I have tried to get initial starting point about the dimensions of the H66000 throat (in the mean time, while Guido would give exact) as on the attached figure. BUT I HAVE ONE PROBLEM MORE, 476 driver is 1.5"-mouth driver, and I have 2"-mouth driver, so the problem for coupling such driver would need more elaboration.
this is a 1.5" throat, not 2"
don't know if it is exactly 38mm or 39mm, but certainly not 50mm
Don't know what exactly is going on here? Do you want to design a 3rd version of the horn?
There are already 2 versions:
1) There is Jan's version and if you ask you might get the files from him (I think so)
2) There is my version which is a scaled 9800H. My exact files doesn't make sense for you as you then need my cabinets also. Horn and cabinet belong together with the EV2 design.
Sorry Guido, I have made a mistake, I have totally forget that 476 driver is 1.5"-mouth driver, and I want to connect 2"-mouth driver to the horn look-like H66000, so first I have to think how to do that.
Initially something like JBL has done with 2328 adapter, and try to calculate how the interconnection can be made.
Regards
Ivica
The 2" drivers include a 1.5"/2" adapter in their throat, with a slow flare, so you have to take it into account when designing your horn (and it will not be "rapid-flare")
http://www.jblpro.com/catalog/suppor...=298&doctype=3
Yes, some kind of adapter like 2328 adapter has to be incorporated into the horn throat. Some idea is done by Mr.Widget:
http://www.audioheritage.org/vbullet...ll=1#post48092
but some other solutions are possible. My first idea is to think about "quadratic throat WG =Q_WG" (or Edgard "Oblate spheroidal WG =OS_WG") which are
relatively "rapid flare". As can be seen from attached figures, the transition from the throat in horizontal plane for 120 deg horn (60 deg half coverage)
can be reach in the first 21.8mm (about 0.86" if Q_WG is applied, or even faster if OS_WG), but the problem is to calculate the shape of the "bubble" in the vertical plane. My 'first initial ques' would be that if Q_WG would be applied that almost no "bubble" would be needed, but almost horizontal plane till full flare reached in horizontal plane, and after that next , about 1" "slant" part in order to reduce the distance between upper an lower plane of the horn to the desired value about 1.375" to 1.5", after that with very 'slow flare' in vertical plane, before reaching the hon lips.
There is no acoustical theorie for the transition from round to square. At some place there will in most cases be a restriction in one plane (often vertical) which results in some cancellation of higher frequencies. It is wise to make the transition "smooth".
Public material, which I have studied in depth, will not show any usable details of the transition in the Everest horn. (I have followed The discussions about the Everest II right from the beginning.)
Measurements are the the basis of network modifications.
Guidos work is outstanding in any aspect.
____________
Peter
I am absolutely amazed with the Guido's gigantic astonishing masterpiece, which is approved by precises measurements,
so there is no doubt about that. My congratulations again.
My idea is first to try to understand the 'secretes' which are incorporated into the H66000 horn design, and may be to
get something useful design with "affordable drivers".
So I will try to put here some of my "speculations" just in order to 'inspire" some of other members of LH forum,
who have much more knowledge and experience in "horns construction domain" so, if any of us want to make "JBL-look" design can better understand what has to be done.
I am absolutely sure that we will not get "Noble's Prize" for our work, but may be our knowledge would be a bit "higher" .
reagrds
Ivica
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