User manual ELECTRO-VOICE DL12X EDS

[. . . ] A smoothed swept-sine-wave input is used for this measurement to provide a more informative curve to the end user. TYPICAL ENCLOSURES The most extended bass, lowest distortion and best control is usually realized in properly designed vented enclosures. In such designs, the vent, or port, actually provides the lowest octave of output. 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. [. . . ] Two main test specifications are used: the "AES Recommended Practice for Specification of Loudspeaker Components Used in Professional Audio and Sound Reinforcement" (AES2-1984/ ANSI S4. 26-1984) and the "EIA Loudspeaker Power Rating Full Range" (ANSI/EIA RS-426-A 1980). Both of these specifications use noise spectrums which mimic typical music and test the thermal and mechanical capabilities of the components. Electro-Voice will support relevant additional standards as and when they become available. Extreme, in-house power tests, which push the performance boundaries of the components, are also performed and passed to ensure years of trouble-free service. FIGURE 11 -- Maximum SPL at 1 Meter in Typical Enclosure (2. 0 ft3 tuned to 45 Hz) Dimensions (see Figure 5), Outer Diameter: 309 mm (12. 17 in. ) Overall Depth: 138 mm (5. 45 in. ) Net Weight: 8. 8 kg (19. 5 lb) Shipping Weight: 10. 0 kg (21. 5 lb) DESCRIPTION The DL12X low/mid-frequency reproducer is a 12-inch, 8-ohm driver designed for professional high-level, high-fidelity monitoring and sound reinforcement. Its design assures linear, low-distortion output, high power capability and efficient heat transfer. Incorporated into the design are three exclusive Electro-Voice innovations. patent #4, 547, 632), a Teflon® -based coating, is applied to the inside diameter of the top plate. 4 Occasional violent power peaks of several seconds may expand a transducer's voice coil into contact with the top plate, causing failure. The coating lubricates any rubbing contact and provides electrical insulation between the coil and the steel top plate. The Thermo Inductive Ring (TIRTM) and Flux Demodulation Device (FDDTM), also included in the DL12X design, are aluminum castings _______________________ 4. Teflon® is a registered trademark of DuPont. about 0. 7 that of the original. To achieve a similar response extension without equalization would require an enclosure at least twice the size. The equalization required is a second-order underdamped high-pass filter with a Q of 2 at the enclosure tuning frequency. This characteristic provides a boost of 6 dB at tuning and a 12-dB-per-octave roll-off below. The roll-off protects the woofer from overexcursion due to subpassband signals (see below). Note that the boost does not affect system instantaneous peak output, which is related only to the speaker's displacement ability and effective diaphragm area. 7, noted earlier, describes a number of step-down enclosures and the associated peak boost frequencies for the DL loudspeaker covered by this engineering data sheet. The Electro-Voice XEQ-2 and XEQ-3 active crossover/equalizers offer step-down equalization with a variety of peak-boost frequencies, appropriate for a broad range of specific systems. XEQ-2 and XEQ-3 engineering data sheets are available from ElectroVoice. SUBPASSBAND SPEAKER PROTECTION Below the enclosure tuning frequency, cone excursion increases rapidly. Since acoustic output is also falling rapidly, there is no utility in driving the system with signals much below tuning frequency. [. . . ] Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you. Other Rights: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Electro-Voice Speakers and Speaker Systems are guaranteed against malfunction due to defects in materials or workmanship for a period of five (5) years from the date of original purchase. The Limited Warranty does not apply to burned voice coils or malfunctions such as cone and/or coil damage resulting from improperly designed enclosures. [. . . ]