User manual ELECTRO-VOICE DMC-2181A DATASHEET

[. . . ] All loudspeaker drivers exhibit mechanical resonance modes that add their own time-domain or ringing-mode colorations. These colorations limit and reduce overall system intelligibility. The Eliminator iTM uses RMDTM to control several fundamental mechanical ringing modes. The result is substantially improved vocal range intelligibility and system "openness". [. . . ] When extended low-frequency operation is required, the performance can be further enhanced with the use of the Eliminator iTM Sub, which can be used in either biamp or full-range passive mode. Vented enclosures offer excellent power handling and low distortion in the lowest octave of rated operation. However, it is always advisable to filter material below enclosure tuning to further improve system output and headroom. The Eliminator iTM should be high-pass filtered to reduce subsonic material below 40 Hz. Eliminator iTM Architects' and Engineers' Specifications The loudspeaker system shall consist of a 38. 1-cm (15-inch) low-frequency transducer in a vented enclosure. The high-frequency section shall be a compression driver with a pure titanium diaphragm coupled to a 1-inch throat diameter to a constant-directivity horn having a horizontal included angle (as referenced to -6 dB) of 60° and a vertical included angle of 40° nominal. The loudspeaker shall have a rated frequency response of 50 Hz to 20 kHz ±3 dB and a long-term rated average power handling of 350 watts (EIA RS-426-A). The system sensitivity shall be 99 dB when measured in an anechoic environment with a 1-watt input with a calibrated measurement microphone located 1 meter from the system axis. stand-mount adapter. Specifications: Frequency Response, Measured at 10 feet on axis (normalized to 1 watt/ 1 meter): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 - 20, 000 Hz ±3 dB Long-Term Average Power Handling, EIA Standard RS-426-A: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extreme, in-house power tests, which push the performance boundaries of the woofers, are also performed and passed to ensure years of trouble-free service. Specifically, the Eliminator iTM passes ANSI/ EIA RS-426-A 1980 with the following values: RSR = 5. 175 ohms (1. 15 x RE) PE(MAX) = 350 watts Test voltage = 42. 55 volts rms, 85. 10 volts peak (+6 dB) The "peak" power-handling capacity of a woofer is determined by the peak test voltage amount. For the Eliminator iTM a 85. 10-voltpeak-test voltage translates into 1, 400-watts short-term peak powerhandling capacity. This is the equivalent of four times the "average" power-handling capacity, and is a peak that can be sustained for only a few milliseconds. However, this sort of short duration peak is very typical in speech and music. Provided the amplifier can reproduce the signal accurately, without clipping, the woofer will also perform accurately and reliably, even at these levels. Amplifier Recommendations The power-handling rating of the Eliminator i TM is 350-watts continuous. The specific tests used employ a crest factor (ratio of peak energy to continuous energy of at least 6 dB). During extended testing, the Eliminator iTM is routinely subjected to peak levels far in excess of its continuous rating of 350 watts. Many amplifier designs are capable of producing peak power levels in excess of their ratings as well, so exact "pairing" of loudspeaker rating and amplifier ratings is not necessary. [. . . ] During extended testing, the Eliminator iTM is routinely subjected to peak levels far in excess of its continuous rating of 350 watts. Many amplifier designs are capable of producing peak power levels in excess of their ratings as well, so exact "pairing" of loudspeaker rating and amplifier ratings is not necessary. Amplifier continuous ratings of 250 watts to 400 watts are suggested. Larger amplifier ratings are recommended for maximum dynamic range, but it should be recommended that amplifier continuous levels (as opposed to peak levels) be within the range quoted for the Eliminator i TM long-term average power-handling rating. Stand Mounting The Eliminator iTM is equipped with an internal stand-mount adapter that will accommodate standard 1 3/8-in. [. . . ]