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In Reply to: RE: Excellent, thanks! posted by Luminator on July 28, 2024 at 09:42:47
With measurements, that speaker would likely show a challenging radiation blend at the top of the 7" midrange's range getting pushed to a 5k crossover (2.7" wavelength).
Who does that today? Even JBL (finally) lowered the transition for their 5" midrange to 2.2k with their monitors to provide uniform frequency radiation with the tweeter.
Follow Ups:
If you wanted to combine a 5 inch mid driver or drivers into a horn, to add fully coherently into one acoustic source with the HF driver at the apex, the distance across the horn can only be about 4 inches and one is limited to a crossover about 1200Hz or below. This is that "less than 1/4 wavelength" rule for coherent single source addition that must be followed inside a multi-way horn.
I'd love to get a pair of Wilson Benesch Precision 2.0s to review, but they are in short supply.
WB listens to their own Different Drummer.
The woofer in the Precision 2.0 rolls off at -6dB/Oct.
Even better, the midrange Runs Wild! No networks; it is connected directly to the amplifier!
I can't think of anyone else who does that for a three-way design. (The 2.0 looks like an MTM, but the bottom cone is the woofer and the top cone is the midrange.)
john
A number of companies have created "crossoverless" midranges. It's nothing new. One that comes to mind is Verity, since the 1990s. The company closed up recently, but one of their hallmarks was always no crossover on the midrange, which created some issues of its own.
Doug Schneider
SoundStage!
Great job! JM.
I can't think of anyone else who does that for a three-way design.
Most have learned better than to run a driver more than an octave past its ideal range. Instruments spanning midrange and tweeter would sure sound funky with the disparate polar response.
They were using some Morel drivers with extended flat response at both ends. IIRC, they also used isobarically loaded pairs or trios for each driver. Morel happily sold them LOTS of drivers!
... and that the midrange drivers were beamy and forward.
I am totally aware that Bob Ludwig loved his Egglestonworks Ivys, but those were voiced to Bob's room and his preferences by having the crossovers' key parts swapped out, once the loudspeakers were set up in his room.
ciao,
john
Triple isobaric makes no sense. Isobaric claims constant pressure on the outer driver because the inner driver moves in parallel. But it doesn't. The inner driver is loaded by its box and at some point the inner driver, of course, rolls off, causing the outer driver to also roll off. The main advantage of isobaric is a smaller box for the same bass roll off for the outer driver but at a price, 3 dB loss of efficiency since the inner driver out put is lost but it still uses power and the impedance is halved which can be low enough to make many amps cough(figuratively). A second inner drive only multiples these negatives.
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