User manual ELECTRO-VOICE FM-12C DATASHEET

[. . . ] Like open-backed enclosures, sealed enclosures are very easy to design and build. The EVM®10M performs very well in virtually any possible sealed enclosure, from 0. 5 to 3. 0 cubic feet (internal volume). The overall performance is very focused. QTS (total Q at fs: (Qes Qms) : (Qes + Qms) 0. 170 VAS (volume of air having same acoustic compliance as driver suspension): 39. 6 liters (1. 4 ft3) 0 (half-space reference efficiency): 5. 0% VD (peak displacement volume of diaphragm: SD x Xmax): 0. 115 liters (0. 004 ft3) SD (effective diaphragm area): 0. 035 m2 (54 in. 2) Xmax (peak linear displacement of diaphragm): 3. 3 mm (0. 13 in. ) EVM®10M SPECIFICATION GRAPHICS FIGURE 1 -- EVM®10M Frequency Response in Typical Enclosure (0. 5 ft3), 1 Watt/1 Meter FIGURE 5 -- Fillister and Internal Hex Drive Screws for Front Mounting (not to scale) FIGURE 2 -- EVM®10M Dimensions FIGURE 6 -- Connection of Two EVM®10M Speakers in Parallel (net impedance is 4 ohms) FIGURE 3 -- Front Mounting Detail (not to scale) FIGURE 7 -- Connection of Two EVM®10M Speakers in Series (net impedance is 16 ohms) FIGURE 4 -- Rear Mounting Detail (not to scale) FIGURE 8 -- Connection of Four EVM®10M Speakers in Series/ Parallel (net impedance is 8 ohms) REMEMBER TO REMOVE PROTECTIVE FILM FROM THE REAR OF THE SPEAKER Vented Enclosures The most extended and contoured low-frequency performance with the least amount of distortion is typically realized in properly designed vented enclosures. In such designs, the vent, or port, actually reproduces the lowest octave or so of bass response. [. . . ] The excursion of the EVM®10M at these frequencies is much reduced compared to sealed or open-backed enclosures, directly reducing harmonic distortion. Figure 1 shows the frequency response of the EVM®10M in a half-cubic-foot enclosure tuned to 90 Hz. Tuning this size of enclosure requires only a single, 2. 75-inch-diameter hole cut into the baffle. INSTALLATION The EVM®10M may be front- or rear-mounted, although front mounting is preferred because of convenience. For simple front mounting, the convenient SMH-1 mounting accessory is recommended. Complete mounting instructions for standard front mounting are given below. It is important that recommended baffle openings and mounting hole locations be followed. Front Mounting Front mounting requires a 229-mm (9. 0-in. ) diameter cutout and a 224-mm (9. 62-in. ) bolt circle. I f 1/4-20 screws are used, four screws are sufficient for secure mounting of the speaker. If T-nuts are used, the holes should be 7. 1-mm (0. 281-in. ) diameter (letter "L" drill). It is also widely known that heavily overdriven tube amplifiers are usually capable of double their rated output power, and sometimes more. In this situation, the user would be wise to use speakers having a combined rating of two times the amplifier output. This assures that the speaker has more than enough "thermal headroom" to be confidently used with virtually any guitar amplifier currently available. manufacturer to develop and publish a power test closely related to real-life conditions. Specifically, the EVM®10M is designed to withstand the power test described in EIA RS-426A 1980. This shaped signal is sent to a power amplifier with the continuous power set at 300 watts into the 6 ohms EIA equivalent impedance (42. 5 volts true rms). Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power, or 1, 200 watts peak (85. 0 volts peak). This procedure provides a rigorous test of both thermal and mechanical failure modes. UNIFORM LIMITED WARRANTY Electro-Voice products are guaranteed against malfunction due to defects in materials or workmanship for a specified period, as noted in the individual product-line statement(s) below, or in the individual product data sheet or owner's manual, beginning with the date of original purchase. If such malfunction occurs during the specified period, the product will be repaired or replaced (at our option) without charge. 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 Electro-Voice 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). Incidental and Consequential Damages Excluded: Product repair or replacement and return to the customer are the only remedies provided to the customer. ElectroVoice shall not be liable for any incidental or consequential damages including, without limitation, injury to persons or property or loss of use. [. . . ]