User manual ELECTRO-VOICE 646 DATASHEET

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ELECTRO-VOICE 646 DATASHEET: Download the complete user guide (833 Ko)

Manual abstract: user guide ELECTRO-VOICE 646DATASHEET

Detailed instructions for use are in the User's Guide.

[. . . ] 16 4. 0 Preparing 646 Modules for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4. 1 Recommended Preflight Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4. 2 Module Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5. 0 646 Rigging System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The Electro-Voice Web site (www. electrovoice. com) has detailed information on the subwoofers listed. Electro-Voice® 646 Series User Manual 13 3. 0 Designing an 646 Array (cont') 3. 4 Other Design Examples 3. 41 Dealing with the Relatively High Low-Frequency Variation of Short Arrays The example of Figure 4 is a three-module array addressing a flat floor from a trim height of 23 ft, with the first row 10 ft away from the array and the last row 80 ft away. This design opts for very uniform mid- and high-frequency coverage that hovers around the 0-dB line, with a variation that is well within the optimum ±3 dB at 3, 000 Hz (important for vocal intelligibility) and nearly as uniform (±3. 5 dB) at 8, 000 Hz (the "sparkle" range). Instead of hovering around the 0-dB line, coverage has a distinct bias, rising from about 0 dB at the front to a high of +8 dB about 25% of the way back, then falling slowly back to 0 dB at the rear. This is a function of the relatively short, 4. 7-ft three-module array. The variation at 100 Hz (not shown) is even greater (± 6 dB), and drops continuously from front to back. This means that if the sound is well balanced up front, it will be "thin" at the rear (although intelligibility and clarity will be fine). Figure 8 shows the same array with a modification that provides more uniform "tracking" of the three frequencies. For most of the venue, all three frequencies are within ±3 dB of each other. While levels fall at the rear of the room, the falloff is very uniform with frequency. This provides a more uniform spectral balance front to back, which may be preferred to the performance shown in Figure 4. Figure 8: A three-module 646 example of Figure 4, modified to improve the front-to-back "tracking" of all three predicted frequencies 14 Electro-Voice® 646 Series User Manual 3. 0 Designing an 646 Array (cont') 3. 42 A Five-Module Array Example Figure 9 shows another, five-module array in an 80-ft-deep venue with the front row five ft from the array and whose floor begins to rise about halfway back. The three frequencies not only track very well but nearly all of the venue is within ±3 dB front to back. The attenuation module's cable connector will replace this connector. With the mounting straps on top, place the attenuation module into the pocket between the four bosses adjacent to the PC board and secure with the four screws (provided). Plug the attenuation module's cable into the 7-position header on the PC board as shown in Figure 13. Apply the supplied label to the input panel around the input connectors as shown on the 646-AM Instruction Sheet. Connect a short piece of wire (supplied) from the "SELECT" terminal to the terminal marked -3, -6 or -9 dB, as determined by 646DA. 2. 7. 18 Electro-Voice® 646 Series User Manual 4. 0 Preparing 646 Modules for Installation (cont') Figure 12: 646 input panel removed, showing green PC board and the four bosses to which the optional 646-AM attenuation module will be attached Figure 13: 646 input panel with 646-AM installed showing connector plug-in Electro-Voice® 646 Series User Manual 19 5. 0 646 Rigging System 5. 1 Overview of the 646 Flying System The external rigging parts supplied with each 646 line-array module attach to metal parts internal to each module, so that a finished array places no stress on the wooden enclosure parts. The rigging simplification inherent in the 646 modules is based on the final array being assembled in a fixed manner. The 646 enclosures are vertically trapezoidal--taller at the front than at the back. One module is fastened to another with the bottom of one in contact with the top of another. The vertical aiming angle between the two modules is fixed by their vertical draft angles. The draft angle is 3° for the 646-2082S/906 and 646-2082S/126 long-throw modules and 10° for the 646-2082S/920 and 646-2082S/1220 short-throw modules, producing 6°, 13° or 20° between any two modules, depending on which modules are attached together. [. . . ] Hardware that is bent or showing signs of more than cosmetic surface corrosion should be replaced immediately. Lifting Hoists: Prior to each use, inspect the lifting hoist(s) and associated hardware (including motor(s), if applicable) for any cracks, deformation, broken welds, corrosion, missing or damaged components that could reduce the hoist strength. Never exceed the limitations or maximum recommended load specified by the hoist manufacturer. Always follow manufacturers' recommendations for operation, inspection, and certification. [. . . ]

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