User manual ELECTRO-VOICE 644 DATASHEET

[. . . ] 11 3. 4 Coverage-Uniformity Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3. 5 Multiple-Source Interference in Clusters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3. 51 Reducing Multiple-Source Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4. 0 Preparing EVF and 644 Systems for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Different highpass filter frequencies are recommended for some fiberglass versions based on changes in operation range due to the effects of having a sealed enclosure. Model(s) EVF-1122S/XX EVF-1152S/XX EVF-1121S EVF-1151S EVF-1181S 644-1152S/XX Recommended High-Pass Frequency (minimum) 65 Hz 45 Hz 50 Hz (55 Hz for Fiberglass Versions) 35 Hz (55 Hz for Fiberglass Versions) 33 Hz (45 Hz for Fiberglass Versions) 60 Hz Table 3: Recommended high-pass frequencies for infrasonic protection of EVF and 644 systems 20 Electro-Voice EVF/644 User Manual 4. 0 Preparing EVF and 644 Systems for Installation (cont') 4. 52 Using the EVF-1121S and EVF-1151S Low-Frequency Systems in Full-Range Clusters that Operate on a Single Power-Amplifier Channel The EVF-1121S and EVF-1151S low-frequency systems have integral passive low-pass filters that roll off frequencies above 100 Hz at the rate of 12 dB per octave. This means that these systems can be used to augment the low-frequency output of the EVF-1122/XX and EVF-1152/XX full-range systems without the use of an external digital signal processor (DSP) for crossover from the low-frequency to the full-range systems. As many as two full-range systems can be paralleled with an EVF low-frequency system on a single power-amplifier channel capable of driving a 2. 1-ohm minimum impedance. This simplified, cost-effective configuration is most appropriate for applications that require only moderate or moderately high acoustic output. This is because the full-range systems cannot have the full infrasonic protection provided by the high-pass filters specified in Table 3. However, useful overall cluster protection will be provided by employing the high-pass frequency recommended for the particular EVF low-frequency system used. Note that the EVF-1181S 18-inch subwoofer system does not incorporate a low-pass filter. 4. 53 DSP (Digital Signal Processor) Loudspeaker Presets for Biamp Operation In the biamp mode, the crossover and equalization must be achieved external to the loudspeaker. This is typically done with a digital signal processor (DSP) that has crossover and equalization filters that are adjusted by the manufacturer to provide the essentially flat frequency response mentioned above. The factory presets for the EVF and 644 loudspeakers have been determined for Electro-Voice and Klark-Teknik processors and are available for download at www. electrovoice. com. Presets for other popular processors often can be provided by the Bosch Communications Systems/Electro-Voice technical support group; specific contact information can be found at www. electrovoice. com. See section 6. 0 for additional details on load limits and safety factors. 5. 2 EV-I Rigging Primer The following sections describe the clustering of EVF and 644 systems using one of the following three approaches: 1. EBK-M10 eyebolt kits supplied with each system (used in conjunction with other user-supplied hardware). Optional VRK vertical rigging kits, in conjunction with the supplied EBK eyebolt kits and user-supplied hardware. Optional HRK horizontal rigging kits, in conjunction with the supplied EBK eyebolt kits and user-supplied hardware. In all cases, note that the weight of the cluster can be substantial and the building structure must be capable of supporting the weight. (System weights are given in Figure 1. ) The optional VRK and HRK rigging kits are the most convenient way to assemble EVF and 644 clusters, offering a great deal of flexibility in box aiming angles. Using the supplied EBK eyebolt kits with additional user-supplied hardware is more difficult, but does allow the most flexibility, since not only can box aiming angles be determined but also the boxes can be rotated about their aiming axes, which can improve coverage uniformity in certain venue shapes (EASE 4. 2 allows this option). Electro-Voice EVF/644 User Manual 25 5. 0 EVF and 644 Rigging System (cont') 5. 21 Anatomy of an EVF or 644 Flying System Using M10 Eyebolts 5. 211 Eyebolt Application Warnings NO EyEBOLT SHOULD BE MOUNTED IN THE SIDES OF ANy EVF OR 644 ENCLOSURE IN ORDER TO SUSPEND A SySTEM OR CLUSTER FROM THE TOP. Figure 16: Eyebolts installed incorrectly in the sides of an enclosure in order to suspend it from above EyEBOLTS MUST BE FULLy SEATED AND ORIENTED IN THE PLANE OF PULL AS SHOWN IN FIGURE 17. ALWAyS USE WASHERS TO DISTRIBUTE SUSPENSION LOADS. REFER TO SECTION 6. 3 FOR SPECIFIC EyEBOLT WEIGHT AND ANGLE RESTRICTIONS. Figure 17: Illustration showing the use of washers with fully seated eyebolts, with correct orientation in the plane of pull 26 Electro-Voice EVF/644 User Manual 5. 0 EVF and 644 Rigging System (cont') 5. 212 Eyebolt Installation Installation instructions follow: 1. Remove the M10 flat-head bolts from the enclosure (see Figure 18a). [. . . ] Always raise and lower the load slowly and evenly, avoiding any rapid changes in speed or shifting loads that could result in a sudden jolt to the suspended system or the structure from which it is suspended. Building, Tower or Scaffold Supports: Prior to each use, the strength and load-bearing capabilities of the building, tower or scaffold structural supports should be evaluated and certified by a professional engineer as being adequate for supporting the intended rigging system (including the loudspeakers, grids, chain hoists and all associated hardware). Prior to each use, inspect the building, tower or scaffold structural supports for any cracks, deformation, broken welds, corrosion or missing or damaged components that could reduce the structural strength. Damaged structural supports should be replaced or repaired and recertified by a professional engineer. [. . . ]