User manual ELECTRO-VOICE MH660C DATASHEET

[. . . ] Frequency * ` W_ a d I(D g 1 t, I0 i 0 _' 5OOHZ FIGURE 4 - Harmonic Distortion (120 dB SPL at one meter from midbass horn using typical music spectrum) 130 HORIZONTAL VERTICAL - - - The MH660C is a 60 x 60 deg. two-way system with mid-bass and high-frequency horns that are coaxially mounted. The common acoustic axes of these horns ensures smooth response and coverage in the crossover region when the appropriate signal delay is applied to the highfrequency driver. [. . . ] Two main test specifications are used: the AES Recommended Practice for Specification of LoudspeakerComponents Used in Professional Audio and Sound Reinforcement (AES2-1984/ ANSI S4. 26-1984) and the EIA Loudspeaker Power Rating Full Range(ANSI/EIA RS-426-A 1980). Both of these specifications use random-noise spectrums which mimic typical music and test the thermal and mechanical capabilities of the components. Electro-Voice will support relevant additional standards as and when they become available. Extreme, in-house power tests, which push the performance boundaries of the components, are also performed and passed to ensure years of trouble-free service. Specifically, the MH660C high-frequency section passes AES2-1984/ANSI S4. 26-1984 with the following values: Z, , , = 6. 0 ohms at 7, 000 Hz P = 60 watts Test Voltage = 19. 0 volts rms, 38. 0 volts peak (+6 dB) Selected decade = 1, 500-15, 000 Hz The MH660C mid-bass section passes ANSI/ EIA RS-426-A 1980 with the following values: R, , = 6. 9 ohms (1. 15 x RJ P = 300 watts Test Voltage = 45. 5 volts rms. 91 . 0 volts peak (+6 dB) ARCHITECTS' AND ENGINEERS' SPECIFICATIONS The loudspeaker system shall be a two-way, active, horn-loaded type. The mid-bass frequencies shall be reproduced by a single DL10XSH 25. 4-cm (10-in. ) driver coupled to a MH660 60 x 60 deg. High frequencies shall be reproduced by a 60-watt DH2As2 2-inch compression driver coupled to an HP66 60x60 deg. The mid-bass andhigh-frequencydevices shall be coaxially mounted. The system will reproduce frequencies from 140 to 20, 000 Hz and have a nominal coverage pattern of 60 x 60 deg. The directivity control shall be maintained down to 500 Hz. The crossover frequency shall be 1, 600 Hz. The module shall be capable of producing average sound levels in excess of CROSSOVER, EQ AND SIGNAL DELAY The MH660C is a two-way system which must be biamped with a separate active crossover. 24-dB-per-octave crossover slopes are asIf the MH660C is used in a full-range applicasumed for maximum performance and reliabiltion, additional low-frequency reinforcement, ity. For optimum performance, EQ and signal such as the PI1 15L or a TL-series enclosure delay are required. (Note: the delays noted will be required. below are for fourth-order (24-dB-per-octave) APPLICATIONS Linkwitz-Riley crossover filter characteristics. ) The MH660C has been designed specifically The mid-bass section should be crossed over with the permanent installation market in mind. to match the low-frequency section and at Sports arenas, performing arts centers, audito1, 600 Hz at the high end. [. . . ] Electro-Voice active electronics associated with the speaker systems are guaranteed for three (3) years from the date of original purchase. Additional details are included in the Uniform Limited Warranty statement. Electro-Voice Flying Hardware(including enclosure-mounted hardware and rigging accessories) is guaranteed against malfunction due to defects in materials or workmanship for a period of one (1) year from the date of original purchase. [. . . ]