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Old 11th May 2010, 04:09 PM   #41
doug20 is offline doug20  United States
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No problem, I consider this just agressive lobbying (Its the salesman in me! )

I have 3 or 4 individual instersted along with myself for something that is 15" or less in width.

I know all about all horns available these days and there are zero ellipitcal OS choice available and if we just want a 15" OS waveguide we have to go to Geddes. Nothing else is available any more.

18sound has some really nice looking waveguides but the designs jzagaja is offering is unmatched out there in terms of style!!!

I agree with your point that we have zero options for large size horns too! I see no reason that we can not have BOTH orders filled
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Old 11th May 2010, 04:23 PM   #42
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I'm interested. One thing I'm not sure about: is this group buy designated for the Iwata only? Or are you collecting interest in the other horns listed to also add them?
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Old 11th May 2010, 06:42 PM   #43
jzagaja is offline jzagaja  Poland
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Any horn up to 2 meters diameter, min. order 6 pairs or from a list (any quantity).
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Old 11th May 2010, 11:14 PM   #44
DaveCan is offline DaveCan  Canada
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For those that aren't in the know, meaning me... Are these various horns designed to accept the bolt on style drivers? What I'm getting at is, if I was to get in on this group buy it would only be of interest to me for trying out the GPA 902 or 909 drivers, so I'd want whatever would work best with them, which I have no clue lol ??? I guess they would be crossed over at 1200HZ or thereabouts ???? Thinking on eventually making a diy Altec M19 type cab using the GPA drivers...

Last edited by DaveCan; 11th May 2010 at 11:18 PM.
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Old 11th May 2010, 11:22 PM   #45
agent.5 is offline agent.5  United States
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Quote:
Originally Posted by jzagaja View Post
Any horn up to 2 meters diameter, min. order 6 pairs or from a list (any quantity).

I think 6 pairs of 150hz is doable. In your prior post, you mentioned that big horns need to be made in 2 pieces. I imagine that you will need to glue the two pieces together. Is it possible to design the horn, so the enduser can easily glue them together. Doing it this way allow us to cut the shipping volume in half, as shipping a pair of horns require just stacking up 4 pieces on top of each other with some fillings in between.
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Old 12th May 2010, 02:08 AM   #46
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Quote:
Originally Posted by doug20 View Post
.....
I know all about all horns available these days and there are zero ellipitcal OS choice available and if we just want a 15" OS waveguide we have to go to Geddes. Nothing else is available any more.
.......
Although it is not a "true" Geddes Oblate Spheroid expansion, the "Quadratic Throat" horn by Charles Hughes is quite close. The "white paper" is easy to find on the Web, but it is not very useful. There is a Patent and also a copy of a conference presentation by Hughes and these are posted on the Web.

These (horns / Wavegudes) can be asymmetric (rectangular) and are fairly easy to build yourself (no casting, lathe, or fiberglass invloved). They are fairly close to the the Geddes design, because Dr Geddes goes into a fit whenever someone mentions them.
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Old 12th May 2010, 10:55 AM   #47
sendler is offline sendler  United States
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Default 1.6" entry

Quote:
Originally Posted by WithTarragon View Post
Although it is not a "true" Geddes Oblate Spheroid expansion, the "Quadratic Throat" horn by Charles Hughes is quite close. The "white paper" is easy to find on the Web, but it is not very useful. There is a Patent and also a copy of a conference presentation by Hughes and these are posted on the Web.

These (horns / Wavegudes) can be asymmetric (rectangular) and are fairly easy to build yourself (no casting, lathe, or fiberglass invloved). They are fairly close to the the Geddes design, because Dr Geddes goes into a fit whenever someone mentions them.
Too bad they manufacture it with a 1.6 inch entry.
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Old 12th May 2010, 11:00 AM   #48
jzagaja is offline jzagaja  Poland
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Yes, with OSWG you can only fine tune a given throat. Theoretically you can make 1.6" throat and use 1.4 and 1" drivers. Conical duct from waveguide and driver will be slightly longer and quarter wave resonance closer to 1kHz (or Fs). This resonance require additional trap in the crossover.
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Old 12th May 2010, 11:52 AM   #49
doug20 is offline doug20  United States
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Quote:
Originally Posted by WithTarragon View Post
Although it is not a "true" Geddes Oblate Spheroid expansion, the "Quadratic Throat" horn by Charles Hughes is quite close. The "white paper" is easy to find on the Web, but it is not very useful. There is a Patent and also a copy of a conference presentation by Hughes and these are posted on the Web.

These (horns / Wavegudes) can be asymmetric (rectangular) and are fairly easy to build yourself (no casting, lathe, or fiberglass invloved). They are fairly close to the the Geddes design, because Dr Geddes goes into a fit whenever someone mentions them.
I have the QSC HPR-152i waveguides already, they measure very, very well and are $14 so we can not go wrong on that front.

What I want is a specific look that follows a specific science. A Small Iwata (no more then 15" wide) is what I really, really want. Im not sure what frequency that is but I LOVE the look.

Also I have a question on the OS12WG, what is the size of the throat on that, I would assume 1"?
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Old 12th May 2010, 01:38 PM   #50
jzagaja is offline jzagaja  Poland
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Yes OSWG has 1" with fine tune possibility. Larger than 1.4" does not make much sense. It can be sold with a matched driver too (+$50), replacement diaphragm is then $10.
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