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JBL JBL 5234


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JBL JBL 5234A Service Manual

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The 5234A Electronic Frequency Dividing Network is designed for use with studio monitor or sound reinforcement loudspeaker systems to provide a cleaner signal from the power source directly to the Individual loudspeakers of the system. By dividing the audio spectrum before power amplrfrcation, treble tones are separated from, and unaffected by, bass frequencies. The result is more efficrent utilization of available amplifier power. Direct coupling to the loudspeakers also eliminates the insertion loss typical of most passive networks and permits realization of the maximum damping factor available from a given amplifier. The 5234A, a dual-channel unit, can be used for biamplification of two loudspeaker systems or to control both transition points in a tnamplifred system. The latter can be accomplished by utilizing one channel for the lower crossover frequency and the other channel for the high frequency transition. The 5234A IS an electronic crossover network utilrzrng active filters It exhibits unity gain in the pass band, provides adequate output to drive any quality amplifier, and operates at extremely low distortion levels at full rated output. A programmable high pass filter removes subsonic energy below the lowest usable speaker frequency.
The crossover frequency is determined by inserting the proper printed circuit card into each channel circuitry. Cards with fils ter slopes of 18 dB per octave are available for crossover frequencies of 80H.z 500 Hz, and 800 Hz. Cards with filter slopes of 12 dB per octave are available for the following frequencies; 250 Hz, 500 Hz, 800 Hz, 1200 Hz, 5 kHz, and 7 kHz. In addition, cards are available with specific crossover characteristics for the JBL 4343,4350,4345,4355,4430 and 4435 studio monitors Blank cards are also available to allow construction of circuitry for other crossover frequencies. The units are shipped with two cards that convert each channel to a unity gain audio distribution amplifier having two identical outputs. Each channel of the 5234A is provided with a continuous level control for high frequency shelving.
Model 5234A Electronic Frequency Dividing Network
Architectural Specifications


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The sound system described herein shall be equipped with separate power amplifiers for low (midrange) and high frequency program material. A dual-channel low-level active network shall be provided to filter program material at the designated crossover point(s).The inputs shall be transformerless, symmetrical and floating. Dual-in-line switching shall provide selectable low frequency equalization and subsonic filtering.The frequency dividing network shall be equipped with separate output buffer amplifiers for low and high frequency program material. Crossover frequency selection shall be accomplished by internally mounted plug-in circuit modules. Each module shall be designed with the crossover frequency printed in such a position as to be easily read through a window In the front panel of the electronic frequency dividing network. The designated crossover frequency shall be the point at which the slopes of the pass band curves cross and where each is 3 dB down from the average output level.This point.shall be within -+ 10% of the designated frequency. The filter slope shall be 12 dB or 18 dB per octave. The unmodified frequency response of the dlvidlng network shall

I .Specificatiotls

Gain Rated Output Distortion
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Frequency Response Crossover Frequency Filter Slope High Pass Filtering Filter Frequency 20 Hz 20 Hz 30 Hz 30 Hz 30 Hz 40 Hz 40 Hz Input Impedance toad impedance Output Impedance Channel Isolation Signal/Noise Ratio Controls
0 cfB in,fhe pass bancf 6.2 V [+ 18 dBv) 0.01% THD, 20 Hz-20 kf-tt @ + 18 dBv into > 100 kn load -c0.5 dB, 20 Hz-20 kHz Selectable by plug-in module, - 3 dB crossover point f 10% 12 dB/octave or 18 dB/octave Level at Filter Frequency -3dB +6dB -5.5 dB - 1.5 dB +6dB -3 dB +6dB 50 kn, symmetrical floating 600 R or greater 50 a, unbalanced >70 dB, 20 Hz-20 kHz ~90 dB, 20 kHz equivalent bandwidth2 High frequency level Power Supply voltage select
Filter Q 0.707 ;.54 0.0.707 2
be 20 Hz-20 kHz, to.5 dB. DistortIon shall be less than 0.03% THD at + 18 dB, and 0.01% THD, + 18 dBv into a 100 kn load. Signal-tonoise ratio shall be greater than 90 dB at rated output, 20 Hz-20 kHz eaulvalent bandwldth. Internal provisIon shall be made for switch selectlon of parallel monaural low frequency outputs A high pass filter with 12 dB per octave slope shall remove subsonlc energy below the lowest usable speaker frequency A dual In-line switch shall provide the following programmable options for the subsonlc filter a Flat frequency response slope, Q = (Butterworth) slope, Q = 2 (6 dB boost @ 20 kHz) slope, Q = slope, Q = 0 84


Screw-type terminal strip 6.3 mm (X in) phone jacks, three-circuit (tip-ring-sleeve) symmetrical, floating Screw-type terminal strip Output 6.3 mm phone jacks, two-circuit, unbalanced 6 W, 100-120/200-240 V AC, Power Retlukemerits 50/60 Hz 5oC (41oF) to 55oC (132oF) I:. Operating Temperafure 483mmx44mmx194mmdeep Dimensions 19inxlX inx75/8 indeep 1.8 kg 4 lb Net Weight Shipping Weight 6~ lb 3 kg Crossover Cards Cone required per channel? 51-513CLblank 18 dB/octave 51-5132-500 Hz 51-5133-800 Hz 51-5138-80Hz 51-5145-For 4345,4355 studio monitors 52-5120-blank 12 dB/actave 52-5121-250 Hz 52-5122-500 Hz 52-5123-800 Hz 52-5124- 1200 Ht 52-5125-5000 Hz 52-5127-7000 Hz 52-5130-For 4430,443s studio monitors 52-5140-For 4343,435O studio monitors Input
~OdBv=0775Vrms(tmWinto6M)O), p&q&es 20 Hz-20
b 20 Hz hlg h pass filter, 12 dB/octave c 20 Hz high pass filter, 12 dB/octave d 30 Hz high pass filter, 12 dB/octave e 30 Hz high pass filter, 12 dB/octave
f 30 Hz high pass filter, 12 dB/octave slope, Q= 2 (6 dB boost
@30 Hz) g 40 Hz hlg h pass filter 12 dB/octave slope, Q = (Butterworth) h 40 Hz high pass filter, 12 dB/octave slope, Q= 2 (6 dB boost @40 Hz)
Isolation between channels shall be greater than 70 dB. The electronic crossover network shall be a JBL 5234A


for the 5234A loudspeaker


can be utlllzed the low channel
for trlampllflcatlon frequency This allows and high

of a single


by connecting

of one channel completely

to the Input Independent

termmals adjustment

of the other


of the mldrange


kbiz equivalent





JBL/harman international

Callfornla 91329 U S A

SS-5234A Printed in U.S.A
JBL Incorporated 8500 Balboa Boulevard, P 0 Box 2200, Northndge,


AC-ate, *3dB

smooth reproduction from 35 to 20,000 Hz,


94dBSPL,lW,lm 102 dB SPLat 10 feet at one-half rated power input Mountable in vertical or horizontal orientation Components: 380 mm (15 in) low frequency loudspeaker, 250 mm (10 in) midrange loudspeaker, high frequency compression driver with horn/lens assembly and ultra-high frequency transducer Balance controls located behind the removable grille Rear mounted switch for bi-amplificatfon or full passive crossover Oiled wulnut or textured gray enclosure The 4343B StudfoMonitor
The 4343B represents an extension of the research and development effort that produced the 4350 Studio Monitor, JBL top system, which uses dual low s frequency drivers. This new monitor accurately reproduces the full range of fundamentals and overtones m music at sound pressure levels approximating those of an onginal performance. The exceptionally smooth urlde-band reproduction. clarity, transient response and low distortion of the 4343B results from total integration of the components that make up the four-way system so that each transducer reproduces only that portion of the audio spectrum for which it is specifically designed. Deliberately restncting the operating bandwidth of the individual drivers results in maximization of each unit transient response. Another benefit of bands width limitation is that each driver operates only in the region of the audio spectrum through which ft exhibits controlled sound distribution. thus a dispersion pattern for the complete system is achieved which is ideal for studio use The passfve frequency divlding network supplied with the 4343B controls the acoustic output of all the mdivldual transducers, and may be switched for bi-amplification

Low FrequencyLoudspeaker

The smooth performance and instantaneous transient response of the 250 mm (10 in) midrange loudspeaker is 2 largely responsible for the outstanding instrumental clarity vocal definition and dimensional accuracy of the system. The magnetic assembly, weighing 4.7 kg (10% lb), utilizes JBL SFG design to reduce second s harmonic distortion. The 75 mm (3 in) edgewound copper ribbon voice coil is suspended within a powerful magnetic field havfng a flux density of 1.02 T (10,200 gauss). The integrally stiffened cone is terminated with an exclusive JBL ring compliance that allows long excursions while maintaining linear travel.
High Frequency Compression Drfver
The high frequency compression driver provides smooth, accurate response and is capable of delivering the high power output levels required in monitor applications. The closed magnetic assembly is energized by an Alnico V magnet, weighs 4.5 kg (10 lb) and achieves a flux density of 1.9 T (19,000 gauss) in the voice coil gap. A ring of pure silver deposited on the circumference of the pole piece maintains uniform impedance through the highest frequencies, extending the bandwidth of the driver. The diaphragm, pneumatically formed of 0.05 mm (0.002 in) aluminum foil stock, is driven by a 44 mm (1.75 in) edgewound aluminum ribbon voice coil. The wavefront emerging from the diaphragm is directed through the concentric channels of a phasing plug prior to distribution by the horn/lens assembly Horn/Lens Assembly Output from the high frequency compression driver is distributed through a controlled pattern by the horn/lens assembly The horn fs formed of a rigid casting to eliminate spurious resonance. The exponential taper rate of the horn controls the expansion of the wavefront providing proper acoustic loading of the driver diaphragm and determines the vertical dispersion pattern of the assembly The
The 380 mm (15 in) low frequency loudspeaker is mounted in a ported enclosure having an internal volume of 156 litres (5.5 ft3). The driver features extreme, solid low frequency reproduction with smooth response well past its crossover frequency The unit is energized by an 8.5 kg (18% lb) magnetic assembly incorporating JBL unique Symmetrical Field s Geometry (SFG), a design which reduces second harmonic distortion to inconsequential levels. The assembly concentrates a magnetic field having a flux density of 1.2 T (12,000 gauss) in the voice coil gap. The 100 mm (4 in) edgewound copper ribbon voice coil is hand wound on a heat resistant support The support is affixed to a rigid cone having optimum mass, density and rigidity for exceptional transient response and maximum efficiency with the bandwidth of the driver.

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acoustic lens functions in a manner analogous to a divergent optical lens. Its 11 plates, set at a precise angle to the enclosure baffle panel. provide controlled propagation of high frequency acoustic energy in the horizontal plane. Ultra-High Frequency Transducer Overtones above 9000 Hz are reproduced by a compression driver and diffraction horn specifically designed for reproduction and dispersion of energy at the extreme high end of the audio spectrum. The compression driver consists of a 1.5kg (3.25 lb) magnetic assembly energized by an Alnico V magnet. The 44 mm (1.75 in) edgewound aluminum ribbon voice coil, suspended within a field having a flux density of 1.65 T (16,500 gauss) is affixed to a heat resistant support bonded to a ring diaphragm pneumatically formed of 0.006 mm (0.0022 in) aluminum foil. Output from the diaphragm is directed through the integral diffraction horn, which produces the unit wide high frequency dispersion pattern. s Frequency Dividing Network The 4343B is provided with a high level, passive frequency dividing network for the three transitions of the system The network is fitted with a rearmounted switch and separate input terminals for bi-amplification The circuitry has been designed urlth consideration for the various performance characteristics of the drivers and their location on the enclosure baffle panel. The network has been designed for continuous high power application. capacitors are non-mductive. non-polarized types urlth high AC current capacity and special inductors are used to minimize power losses within the network. Each inductor is calibrated on a sensitive electronic bridge and its value set precisely A special circuit card providing the precise cross over characteristics for bi-amplification of the 4343B is available for use in the JBL 5233 or 5234 Electronic Frequency Dividing Network Conventional electronic networks can be used, but they may not have the exact frequency and filter slope characteristics required for optimum performance of the system.

midrange loudspeaken for optimum bass response and to control cone excursion. thus minimizing distortion and maximizing power handling capacity of the drivers To eliminate resonance, the enclosure is constructed of dense 19 mm (in) and 25 mm (1 in) stock with a 15.~1~baffle panel, all ]oints are carefully interlocked and glued, the back, side, top and bottom panels are lined with acoustic damping material and are each stiffened by multiple braces glued and screwed to the panel and to the adlacent surfaces of the enclosure The baffle section which supports the midrange, high frequency and ultra-high frequency transducers may be rotated 90 left or right for horizontal system installations Test Parameters The accompanying graph and specifications were compiled from measurements made under standard laboratory test conditionsThe complete loudspeaker system, including the enclosure, was mounted flush in the center of a large, flat baffle in an anechoic environment. Calibrated condenser microphones were suspended at a measured distance from the sound source, sufficiently out of the near field. All associated electronic equipment was checked and calibrated before tests were run. Response
Frequency response of the 43436 taken wth %-octave band pmk nowe Measured response contour of a typlcal system averaged through an mcluswe arcof 60 in the honzontal and 30 m the vertical planes does not dewate more than 2 df3 from the above curve
In keeping with current trends in studio design that encourage creativity JBL studio monitor enclosures feature contemporary styling and are offered in two finishes, each with a complementary grille color. The enclosure, however, contributes much more than striking appearance.The low frequency loudspeaker is housed in a chamber having an internal volume of 156 litres (5.5 ft3).The midrange loudspeaker is enclosed in a separate, isolated sub-chamber having an internal volume of 14 litres (0.5 ft3).The internal volume of the acoustic chambers and physical configuration of the ducted ports are carefully calibrated to properly load the low frequency and


Maximum Power Input Bi-amplification Below 300 Hz Above 300 Hz Single amplification Nominal Impedance Power OutputW continuous sine wave 75 W continuous sine wave 75 Wcontinuous 8rl 102 dB SPL measured at m (10 ft) in a room volume of 57 m3 (2000ft3) with % rated power input 35 to 20,000 -4 Hz +3 dB sine wave
Caution Sound pressure levels produced by the 43438 may cause permanent heanng loss Thesuggested maxlmumexposureis 115dBA (Department of Labor Bullebn #334) for no more than 15 mmutes JBL continually engages m research related to product Improvement New materials. production methods and design refinements are Introduced Into exlstlng products without notlce as a routme expressIon of that philosophy For this reason, any current JBL product may differ I some respect from Its publlshed descnption but will always equal or exceed the ongmal design specifications unless otherwlse stated d


Response dB at 31.5 Hz,
Sine Wave, On-Axis %-Octave Band (400 Hz Reference) Polar Response Sensitivity3
+2 dB at 1 kHz, +2 dB at 20 kHz No less than -3 dB at 60 horizontal and 30 vertical to 16 kHz 94 dB SPL measured at 1 m (3.3 ft) with l-watt input averaged from 100 to 1000 Hz 1% or less third harmonic generation from 35 to 800 Hz 2% or less third harmonic generation above 800 Hz 300,125O and 9500 Hz Textured gray or oiled walnut Black fabric with the gray finish; Dark blue fabric with walnut
Distortion % Power, 100 dB SPV3.0 m (10 ft), Single Frequency Crossover Frequencies4 Finish Grille Enclosure Volume Low Frequency Chamber Midrange Chamber Enclosure Net Weight Shipping Weight Accessories (for bi-amplification) Dimensions

156 L 14 L

5.5ft= 0.5 ft3 mm
1050 mmx635 mmx435 41% inx25 inxl7X in 84 kg 92 kg 185lb 202 lb
5233 Electronic Frequency Dividing Network, single channel; 5234 Electronic Frequency Dividing Network, dual channel; 52-5140CrossoverCard, required for the low frequency transition of the 43438.
is 3 dB mimmum, Precision Sound ie
Power amplifier a 75-watt rating *Power Meter. output
headroom recommendation use a 150-watt amplifier with a B&K Impulse


%nlike manytheater type loudspeaker systems that exhlblt sensetivity peaks in the mldrange region, the 43438 provides substantially the same sensitivity through the full range of audible frequencies. Measured sensitivity below 500 Hz or above 2ChXI Hz may be considerably greater than that of other systems with higher sensitivity ratings The 52-5140 crossover card installed in a JBL electronic frequency dividing network will provide the appropriate crossover characteristics for bi-amplification If another electronic network IS used. a 12 dB/octavefllter slope will provide the closest approximation of the 52-5140

Professional Division James B. Lansing Sound, Inc., 8500Balboa Boulevard, Northridge, California 91329U.S.A.





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