User manual ELECTRO-VOICE DML-2181A

[. . . ] 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. output of a white-noise generator (white noise is a particular type of random noise with equal energy per bandwidth in Hz) is fed to a shaping filter with 6-dB-per-octave slopes below 40 Hz and above 318 Hz. When measured with the usual constant-percentage bandwidth analyzer (one-third-octave), this shaping filter produces a spectrum whose 3-dB-down points are at 100 Hz and 1, 200 Hz with a 3-dB-per-octave slope above 1, 200 Hz. Architects' and Engineers' Specifications The loudspeaker system shall be a subwoofer system consisting of one 45. 7-cm (18-in. ) low-frequency transducer in a vented quasi band pass design. [. . . ] The system shall be capable of either biamp operation or full-range passive (when used with the Eliminator iTM stage system or other appropriate full-range system). The passive mode shall provide first order low-pass filtering. The system shall have a rated frequency response of 40 Hz to 100 Hz (passive mode) and is capable of extended high-level operation within that range. Power handling (long-term average) shall be 400 watts when EIA RS-426-A 1980 is employed as a test method or 500 watts when AES 1984 is used at the test method. The system sensitivity shall be 98 dB (101 dB with 1/2 space load-common orientation) with a 1 watt input at a distance of 1 meter. The nominal impedance shall be 8 ohms and shall produce a combined impedance of 4 ohms when used with the Eliminator i TM , full-range system. The system dimensions shall be 85. 4 cm (33 5/8 in. ) high by 42. 9 cm wide (16. 9 in. ) and 60. 9 cm (24 in. ) deep and have a net weight of 87 lb. Power handling To our knowledge, Electro-Voice was the first U. S. manufacturer to develop and publish a power test closely related to real-life conditions. First, we use a random-noise input signal because it contains many frequencies simultaneously, just like real voice or instrument program. Second, our signal contains more energy at extremely high and low frequencies than typical actual program, adding an extra measure of reliability. 400 watts AES (1984): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 watts Sound Pressure Level, 1 W/1 m: Full space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 dB Half space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 dB Crossover: . . . . . . . . . . . . . . . . . . . . . . . Acoustic/electronic filter output Transducer Complement: . . . . . . . . . . . . . . . . . . . . . . . . . 1 ea DL18BFH Impedance, Nominal: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ohms Minimum: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 1 ohms When used with Eliminator iTM in satellite configuration nominal 4 ohms, minimum 3. 2 ohms. USA Canada Germany France Australia Hong Kong Japan Singapore Mexico UK Africa, Mid-East Latin America Enclosure Tuning: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . phone output to Eliminator iTM Enclosure material/construction: . . . Black carpeted MDF Dimensions: Height: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] phone output to Eliminator iTM Enclosure material/construction: . . . Black carpeted MDF Dimensions: Height: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85. 9 cm (33. 8 in) Width: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43. 8 cm (17. 25 in. ) Depth: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]