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JBL ES52000 Controller
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 performance. 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,

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Service and User Manual
Manual type:
Service and User Manual
9.03 Mbytes (9465583 Bytes)
01 January 1992
Scanned document, reading partly badly, partly not readable.
Upload date:
29 October 2017


Introduction ... ____________ ... _____________________________________________________________——3 Unit Description ... — ... 4 Installation ... — ... —5 Grounding ... 8 Input Connections ... 9 Using Floating or Balanced Cables for Longer Runs ... 9 Setup ... ____________ ... ________________________________________________________________15 Specifications ... ... 17 Illustrations 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 Tables 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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