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The Midax high frequency horns included with a number of English and American amplifier models was actually a midrange horn and was manufactured by the Goodman Speaker Company. The best this horn could pass is about 5kHz. The English and American amplifiers had an oil filled capacitor wired in series with the horn and the capacitors' value was changed as the impedance and speaker configuration demanded.
The following was excerpted exactly as written from an original 1960's MIdax Horn advertisement;
Mid-range Driver MIDAX H950 - When the
major advantages of a horn loaded middle
register loudspeaker are required, the Midax
H.950 is the correct choice - giving freedom
from distortion, complete smoothness of re-
sponse and extreme efficiency. The total
frequency range covered by the Midax 950 is
from 650 c.p.s. to 8,ooo c.p.s. Crossover fre-
quencies should be at 950 c.p.s. and 5,ooo c.p.s.
to allow proper overlap. Sturdy die-cast
exponential horn with wide flange for easy
fixing. The self-centering diaphragm can be
readily replaced without special tools.
System Power Handling Capacity: 25 watts
(British rating), 50 watts (American rating).
Specification:
Impedance: 15/16 ohms
Baffle Hole: 5 5/8" x 2 9/16" (14.3 cms x 6.5 cms).
with 5/16" (0.79 cms.) radii at corners.
Fixing Holes (Horn Flange): 6 holes, 0191" diam.
(5 mm.)
Overall length: 9 15/16" (25.2 cms). Weight 4 1/2 lbs.
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