Equipment information

JBL ES52000 Controller
Model ES52000
Date 1992
Category Professional music equipment
Group Controller
Description Digital Controller
                                    The ES52000 is factory-programmed for use in conjunction
with the JBL loudspeaker systems listed in Table 4 on page
10. It combines the functions of two-way dual-channel or
two-, three-or four-way single-channel active frequency
division, system equalization, lime delay, and (in
single-channel configurations) transducer protection
limiters, all providing unique advantages achievable only in
the digital domain.

All Crossover and system equalization filters in the ES52000
are FIR (finite impulse response) digital designs whose
amplitude responses are independent of their phase responses
and which have constant group delay and no phase shift;
conventional analog and other digitally implemented filters
have HR (infinite impulse response) characteristics which
inherently change the signal’s phase relationships in direct
relation to their filtering actioa

The Crossover filters, in addition to being zero phase shift
FIR types, feature extremely steep slopes: between 50 and
100 dB per octave, depending on the particular system
settings, and have precision signal alignment correction to
compensate for the different acoustical centers of the
various cone transducers and compression drivers as mounted
in the JBL systems for which it is factory programmed.

Because of the large number of variables which cannot be
anticipated, the ES52000 does not replace any equalization
required to compensate for acoustical conditions caused by
the space in which the loudspeakers are mounted or the
location of the loudspeakers in that space.

The ES52000 utilizes audiophile grade analog circuitry, 64
times oversampled 18 bit A to D (analog to digital)
converters, and 8 times oversampled 18 bit D to A (digital
to analog) converters, with full 20 kHz bandwidth, 44.1 kHz
sampling rate, and 24 bit signal processing in the digital
domain for maximum dynamic range and minimum signal
distortion at low levels. Both inputs are electronically
balanced. The four outputs are unbalanced low impedance;
optional transformers may be added by a qualified technician
if symmetrical, floating output isolation is desired.

Thirty-twro points of FIR digital equalization are provided
in both low frequency and high frequency bands, in single-
and dual-channel modes, to smooth the loudspeaker frequency
response down to approximately 150 Hz. The system
equalization filter coefficients have been adaptively
derived by computer analysis in anechoic conditions and
confirmed in extensive listening tests. An active analog two
pole high pass filter optionally adds 2.5 db of boost at 30
Hz and provides infrasonic rolloff for cone transducer
protection below 30 Hz; this filter may be enabled by a
qualified technician. Between 30 Hz and 150 Hz, loudspeaker
frequency response is boundary dependent and will be
affected primarily by the room and system mounting in the
room; thus, no equalization is provided in this band.

Peak program limiting is provided in each band when the
ES52000 is operated in singlechannel configurations. Output
level controls for each band allow user setup of the ES52000
with the system’s power amplifiers for flat response, while
limiters prevent Amplifier clipping and transducer damage.

Unlike those in other loudspeaker system processors, the
ES52000 limiters do not modify the Crossover frequencies,
slopes, or system equalization, so that the systems’ tonal
characteristics below maximum output are not level-dependent
The limiters are not available in dual-channel two-way mode.

Front panel controls are provided for adjustment of input
gain and muting of each output channel; LED (light emitting
diode) bar graph level indicators provide precise
information on operating mode, input and output levels and
clipping, output limiting and channel muting. Rear panel
controls located under a removable security cover provide
for mode selection, system selection and output level
The ES52000 does not use Amplifier sense cables since its
output signal is based on correct adjustment of its output
level attenuators. Thus, one ES5200Ö can control any number
of loudspeaker systems of the same type and can be located
some distance away from the amplifiers (installation of the
optional output transformers may be desirable in such
cases). If the ES52000 is ' located at the ffiixiftg
position, for example, the Mixer can view its level
indicator LED’s and monitor system headroom during a

Caution: If any of the ES52000’s output channels is driving
more than one power amplifier, each Amplifier connected to
that output must have the same output power and gain in
order to maintain system balance and proper limiting thresholds.

All loudspeaker system settings are contained in a factory
programmed ROM (read only memory) integrated circuit mounted
in an internal socket. This allows a qualified technician to
install a revised ROM containing additional system programs,
so that future loudspeaker system enhancements and changes
may be accommodated by today’s ES52000.

These manuals are available for the above equipment:

Manual Type Service and User Manual JBL-9816-Manual-Page-1-Picture
Pages 35
Size 9.03 Mbytes (9465583 Bytes)
Language english
Date 01 January 1992
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 45cea07e0c0e0dfcbe148cc938782a32
Downloads 132 since 29 October 2017
Introduction ... ____________ ... _____________________________________________________________——3

Description ... —------4

 ... — ... —5

Grounding ... 8

Connections ... 9

Using Floating or Balanced Cables for Longer
Runs ... 9

Setup ... ____________ ... ________________________________________________________________15

 ... ----------------------------------------------------------------------------------------17

Figure 1: ES52000 Block
Diagram ... 3

Figure 2: Fuse
holder ... 6

Figure 3: Fuse holder oriented for 240 V
operation ... 6

Figure 4: Dual-channel two-way
interconnection ... 7

Figure 5: Single-channel two way
interconnection ... 7

Figure &. Three-way high
interconnection ... 7

Figure 7: Three-way low
interconnection ... 7

Figure 8: Four-way
interconnection ... 8

Figure 9: Front
panel ... 13

Figure 10; Rear
panel ... 13

Figure 11: Stereo two-way output indicator
configuration ... 18

Figure 12: Mono two-way output indicator
configuration ... 18

Figure 13: Mono three-way VLF output indicator
configuration ... 18

Figure 14: Mono three-way VHF output indicator
configuration ... 18

Figure 15: Mono four-way output indicator
configuration ... 18

Table 1: Fuse
values ... 6

Table 2: Minimum line
voltages ... 6

Table 3: Input and output connector
wiring ... 9

Table 4: System switch positions for pre-programmed JBL
systems ... 10

Table 5: Output level control settings for use with JBL ES
Series amplifiers ... 12

Table 6: Setup frequencies for adjusting ES52000 output
level controls ... 12

Table 7: Power Amplifier output
voltages ... 12

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