User manual ELECTRO-VOICE DMC-1122X

[. . . ] EV's self-resetting PROTM circuit is built into the crossover network to guard the compression driver from damage. If input power to the driver exceeds the nominal rating, the pro circuit is activated, reducing the power delivered to the driver by 6 dB. The system will remain in this mode of operation until input power is reduced to a safe level. The optimally vented bass section of the EVI-28 is designed using Thiele-Small parameters for efficient performance to below 60 Hz. [. . . ] The recommended operational vertical angle is minus 5 degrees from the top surface of the enclosure to minus 45 degrees, defining a maximum used vertical dispersion of 40 degrees. The standard aiming of the system when it is mounted above a flat floor is with the top of the enclosure parallel to the floor. In this orientation, the system will provide even SPL over a floorplan that is approximately twice as wide as the mounting height, and five times as long. Tilting the enclosure down by approximately 10- to 15-degrees relative to the slope of the floor will produce a floorplan twice as wide as the mounting height and approximately three times the depth. At the standard aiming, the 45-degree nearfield operational angle defines an approximate offset to the first useable row of one-half the height of the speaker system above the listening plane. In a typical installation, the top surface of the loudspeaker will point slightly above the head height of the furthest targeted seating or standing area. This will ensure the minimum amount of slap echo from the back wall. In an under-balcony situation, the sharp cutoff above the zero degree axis prevents early ceiling reflections from causing interference patterns in the listening area. Since the EVI-28 has a very smooth and rapid drop-off towards directly below the cabinet, you can actually stand right in front of the speaker (see Figure 10) without ear strain or microphone feedback. The remarkable absence of lobes to the rear allows the system to be mounted directly overhead to target a particular area without disturbing the audience below or behind the cabinet. For example, Figure 9 shows a typical under-balcony application that has a floor with an upward slope of 5 degrees. The EVI-28 has been thoroughly tested at an AES equivalent power level of 350 watts continuous for 2 hours with 1, 400 watt peaks. This procedure provides a rigorous test of both thermal and mechanical failure modes. Amplifier Power Recommendations As noted in the Power-Handling Capacity section above, the EVI-28 has a randomnoise power capacity of 250-watts long term (1000-watts peak) per ANSI/EIA RS-426-A 1980. The following guidelines will help relate this number to an appropriate power amplifier output rating. To use the EVI-28 to full capacity, skilled experts in sound-system installation and operation will obtain the best results if the power amplifier is 2. 0 to 4. 0 times the long-term average noise power rating of the speaker system. For the EVI-28, this is 500 to 1000 watts. vent low-frequency signal below bandpass from going to the loudspeaker. When using and active crossover, a high-pass filter with a cut-off frequency of 35- to 50-Hz will provide the necessary protection. The filter should have a slope of at least 12 dB per octave. Such subpass band filters are found in many crossovers and equalizers manufactured by Electro-Voice, as well as other commercially available equipment. Enclosure Construction and Refinishing The enclosure is constructed from highgrade void-free 12-mm (0. 5-inch) 9-ply and 18-mm (0. 71-inch) thick 13-ply birch plywood and lined with sound-absorbent cotton batting. [. . . ] The product will be returned to the customer prepaid. Exclusions and Limitations: The Limited Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items described in the individual product-line statement(s) below, or in the individual product data sheet or owner's manual; (c) malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner's manual; (d) malfunction resulting from misuse or abuse of the product; or (e) malfunction occurring at any time after repairs have been made to the product by anyone other than Electro-Voice or any of its authorized service representatives. Obtaining Warranty Service: To obtain warranty service, a customer must deliver the product, prepaid, to ElectroVoice or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice. A list of authorized service representatives is available from Electro-Voice at 600 Cecil Street, Buchanan, MI 49107 (616/695-6831 or 800/234-6831). [. . . ]