User manual ELECTRO-VOICE FM-12C DATASHEET

[. . . ] Open-backed enclosures have been used for electric guitars from the very beginning. Generally, they offer very good performance in many situations. The sound is often characterized as being open and having a full mid-bass response. Although these enclosures are often referred to as "warm sounding, " they do not have an especially tight or solid low-end response. [. . . ] The vent is driven to full acoustic output by a relatively small motion of the speaker cone itself, acting through the air contained within the enclosure. 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. This provides the widest usable frequency response. 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. Mark the baffle opening and screw locations on the blank panel first. After construction, be certain interior is completely free of metal filings, wood chips, etc. 18 or larger stranded wire to connect the loudspeaker to the input panel connector. POWER-HANDLING In musical instrument systems, unlike sound reinforcement systems, it is advisable to use speakers that are rated for at least as much power as your amplifier output rating. 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. The new EVM®10M has a long-term rms power rating of 300 watts. This assures that the speaker has more than enough "thermal headroom" to be confidently used with virtually any guitar amplifier currently available. To our knowledge, Electro-Voice was the first U. S. 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. The EIA test spectrum is applied for eight hours. [. . . ] 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. [. . . ]