ขายลำโพง JBL 4430 ลำโพง Horn Bi-Radial สภาพสวย เสียงดีมาก Made in USA.
ขายลำโพง JBL 4430 ลำโพง Horn Bi-Radial สภาพสวย เสียงดีมาก Made in USA.
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JBL 4430 440,000 (1 unit, released in 1981-1998)
¥ 470,000 (1 unit, around 1983)
Commentary
A bi-radial horn mounted speaker system developed based on the same design concept as 4435.
The bi-radial horn has been researched and developed by JBL Professional Devi John for
several years. By adopting a unique shape in which two radial horns are crossed, the problems
of conventional horns are solved.
There were four key points in the development of this horn : the directivity pattern in the
horizontal and vertical directions is constant in the entire driver operating band (1 kHz to 16 kHz),
the diffusion angle is the same as that of the woofer at the crossover frequency, the second
harmonic distortion is reduced by improving the aperture, and the phase characteristics of
the driver and the woofer are matched by shortening the horn.
Due to the shape of the bi-radial horn, the directional characteristics in the horizontal and
vertical directions are 100 ° x100 °, and the sound pressure level both on and off the axis is flat.
Moreover, by strictly controlling the directional characteristics, the bi-radial horn has the same
diffusion angle as the woofer at the crossover point.
In addition, by making the throat section a long and narrow diffuser throat, the width is narrow
enough for horizontal diffusion. In addition, the horn at the sharp opening is made of a hard
material with low resonance to reduce second harmonic distortion and shorten the horn depth.
Equipped with 38 cm cone type woofer 2235H in the low range.
Like the 2234H, the 2235H is equipped with a JBL original flux-stabilizing ring around the
pole piece to reduce the second harmonic distortion. It is attenuated by -3dB at 35 Hz and
can input 150W up to 27 Hz.
A horn type tweeter composed of a driver 2421A and a bi-radial horn 2344 is mounted in
the high range.
The 2421A is a diamond suspension that replaces the 2420 suspension and allows for
broadband, flatter playback. The diaphragm is made of ultra-thin aluminum and is molded
with the suspension.
The network has a characteristic of 12dB/oct so that a smooth response can be obtained over
a wide bandwidth. Moreover, by controlling the off-axis acoustic characteristics with the
w-open network, a flat power response can be obtained both on-axis and off-axis.
The network is also designed to adjust the driver's mid - and high-frequency ranges
independently, and is compensated by the level control of the front baffle.
The enclosure has a symmetrical unit layout to improve sound localization and
phase characteristics by placing the woofer and tweeter in the same position.
The material is 22 mm thick hard particle board, and the exterior is walnut finished.
Polar coordinate characteristics of bi-radial horn 4430 Components Frequency characteristics
/ impedance characteristics When net grill is mounted Detailed dimensional drawing
Section view
Model Rating
Method 2-Way, 2-Speaker, Bass Reflex System, Floor Type
Units Used Low Band : 38 cm Cone Type (2235H)
For High Frequency : Horn Type (2421A + 2344)
Frequency characteristic 35 Hz to 16 kHz ± 3 db
Directional
(-6dB, 1.25 kHz to 16 kHz) Horizontal : 100 °
Vertical : 100 degrees
Impedance 8 Ω
Output sound pressure level 93dB/W/m
Allowable input 300W (continuous program)
Peak input 2 kW (<10 ms)
Crossover frequency 1kHz
Level control Midrange : -∞～+ 4dB/2kHz
High Frequency : -∞～+ 2dB/12kHz
Enclosure volume 140L
External dimensions Width 556x Height 908x Depth 480 mm
Weight 79.5 kg.
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