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Multi-Way Conventional loudspeakers with crossovers

Doppenberg Dipole horn
Doppenberg Dipole horn
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Old 13th June 2013, 11:07 PM   #1
PeteMcK is offline PeteMcK
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Default Doppenberg Dipole horn

Anyone seen this?: http://forum.bd-design.nl/index.php?id=17004
looks good & combines the least efficient with the most efficient;
wonder what the lack of a back chamber does to the reactance nulling though...
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 13th June 2013, 11:39 PM   #2
JZatopa is offline JZatopa  United States
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That looks quite interesting.
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Old 13th June 2013, 11:40 PM   #3
weltersys is online now weltersys  United States
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Originally Posted by PeteMcK View Post
looks good & combines the least efficient with the most efficient;
As Bert, the builder of the horn said August 14, 2012, 13:36:
"Yes, its an open baffle so frequencies below 80Hz (prototype) will be cancelled more and more while going deeper in frequencies."

Rather large, reminds me of a stacked pair of the Steve Hall designed "Cruncher" horns of the mid/late 1970's, though those used a compression chamber.

Used to bring four dual 15" Crunchers, four mid, and four high horns into 150 seat nightclubs.

Of course, when the guitar player used 8x 12", bass 8x10" and 2x15" and the keyboards were a Hammond B3 & Leslie, Fender Rhodes, Hohner Clavinet, & a Mini Moog, the PA didn't seem so large...

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Old 14th June 2013, 06:13 AM   #4
jamikl is offline jamikl  Australia
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theoretical speakers similar to this were mentioned in another thread some time ago. I can't remember which though. Jmmlc may have been involved in the discussion. It does do interesting things to the rear path length though when you have that horn length rather than a flat baffle and this, if I remember correctly, is even more advantageous if the speakers are mounted in a 'U"frame. I remember also looking at the possibility of using an H frame with the front of the H frame being the front chamber of a horn.
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Old 14th June 2013, 09:50 AM   #5
burgunder is offline burgunder  Denmark
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There's some discussion here too Woofer horn loading
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Old 14th June 2013, 12:11 PM   #6
keyser is offline keyser  Netherlands
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Bert recently demo'ed a quite similar design that featured a BMS coaxial driver in an additional horn instead of the wide-range driver at a Dutch hifi show. At that time it was still a prototype. Although tonally things weren't as neutral (yet?) as I like my speakers to be, it was a quite convincing demo: it simply sounded as big as it looked - larger than life. Realistic? No, but pretty darn impressive!
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Old 14th June 2013, 01:56 PM   #7
tinitus is offline tinitus  Europe
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Doppenberg Dipole horn
funny, when I posted that idea, noone were interested but it still looks good tho
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