What made you finally measure them? Sweet speaker BTW!
That's where I wanted my listening axis of the finished speaker.
Dan
ev hr90 Constant Directivity horn 90 x 40 (Don Keele horn) with an ev dh7 1.4" compression driver, passive lift circuit (resistor paralle with cap, both in series with driver) also with cd-eq in active crossover, 24db crossing at 750hz. I just keep coming back to this system.
http://archives.telex.com/archives/EV/Horns/EDS/HR90 EDS.pdf
33 page pdf, 70's paper by keele on cd horns
http://www.xlrtechs.com/dbkeele.com/PDF/Keele (1975-05 AES Preprint) - Whats So Sacred Exp Horns.pdf
I've wanted to try the 400hz stereo lab horn, but it ain't cheap and I'd read a few posts mentioning beaming.
Defo (here at diyaudio.com) "I used to have a stereo-lab 400hz tractrix horn coupled to an Altec 299 1,4" compression driver. This combo beamed too much for my taste."
Norman
http://archives.telex.com/archives/EV/Horns/EDS/HR90 EDS.pdf
33 page pdf, 70's paper by keele on cd horns
http://www.xlrtechs.com/dbkeele.com/PDF/Keele (1975-05 AES Preprint) - Whats So Sacred Exp Horns.pdf
I've wanted to try the 400hz stereo lab horn, but it ain't cheap and I'd read a few posts mentioning beaming.
Defo (here at diyaudio.com) "I used to have a stereo-lab 400hz tractrix horn coupled to an Altec 299 1,4" compression driver. This combo beamed too much for my taste."
Norman
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)
Something is off about those two sets of curves. The first family has very little directivity (spread) plus a pinching together at 3500 Hz. The second group has a very even spread. I don't think a different driver would cause the difference??
In general, could you guys give some info on measurement angles like: "Taken every 10 degrees" (or whatever)?
Thanks
These come up on eBay all the time. EV has another series of CD horns that I actually prefer (2 in throat): the HP 640 and HP 940.
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Measured w/o baffle looks like, in the first curve, evidencing an apparent diffraction "bloom."
Geddes plots are every 7.5°, as I recall; mine are 5°, typical....
That 10" Dayton looks really good, better than the Nathan, though I'm not sure it's apples to apples.
Anyone tried the 12" version?
Dayton H12RW 12" Round Waveguide 1" Threaded | Parts-Express.com
Could be a great affordable alternative to the Abbey.
Anyone tried the 12" version?
Dayton H12RW 12" Round Waveguide 1" Threaded | Parts-Express.com
Could be a great affordable alternative to the Abbey.
This is directivity plot of the mentioned Dayton 10" + D220Ti
indoor, 1m, 4ms
This is my first sonogram ever, so not sure if it's done correctly. From what I can interpret, the WG is correctly -6db down at 45 deg.
indoor, 1m, 4ms
This is my first sonogram ever, so not sure if it's done correctly. From what I can interpret, the WG is correctly -6db down at 45 deg.
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I put a bunch of them on a baffle (QSC HPR152i, QSC HPR 122i, Dayton 10") and listened to content. I swapped CDs too because I have the different ones and the Dayton/D220 (Screw on version sounded the worst). I also had the Pyle H612, both didnt perform as well as QSC/BMS 4550 (4552) or QSC/Celestion 1745. Also thought from 2KHz on up the Celestion 1425 was impressive (Same price range as the D220). It could be the screw on version, maybe listening to the higher cost BMS4550 just gives me a different POV. Who knows, Im fully aware of many DIY builds with the D220/Pyle stuff but its not for me.
Everyone has there own goals and maybe other goals have the Dayton 10"/D220 play comfortably in its range (which needs to be higher up) but I need my waveguides to play down closer to 1KHz.
FWIW, the polars on all of them are going to be just fine (polars alone without XOs, CSDs, etc isnt going to tell us many differences) but the CSD with the D220 was the worst I have seen with lots of stored energy. Check out the CSDs on the different compression drivers http://sites.google.com/site/drivervault/driver-measurements/acoustic-elegance-td12m
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Not all diffraction horns are the same, not by any means.
I would not discount the EV Horns (if you are referring to the HP640 or HP940) until you have heard them. You might be pleasantly surprised.
Are you anywhere near Southern New England?