User manual ELECTRO-VOICE DL15W

[. . . ] One conductor of #9 stranded, #8 AWG solid, a pair of twisted #15 AWG stranded or a pair of #14 AWG solid conductors will fit. Typical Amplifier Size 400-800 watts per woofer is the optimal amplifier size. Amplifiers of this size will allow maximum output with minimal risk of speaker damage when properly used. Smaller amplifiers can also be used with excellent results. Architects' and Engineers' Specifications The low-frequency woofer shall have a nominal diameter of 457 mm (18. 0 in. ), an overall depth of 188 mm (7. 42 in. ) and weigh less than 9. 3 kg (20. 5 lb). The frame shall be constructed of strong, deformation-resistant die-cast aluminum. [. . . ] The low-frequency transducer shall be the Electro-Voice DL18MT. 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. The excursion of the DL18MT at these frequencies is much reduced compared to sealed or open-back enclosures, directly reducing harmonic distortion and the possibility of speaker bottoming. Thiele-Small parameters are provided so designers can tailor the response to suit their needs. Normally Tuned Enclosures A 1. 8 cubic-foot enclosure tuned to 55 Hz has a smooth extended response to below 50 Hz. The 1. 1 cubic-foot enclosure "bumps up" above 70 Hz but has less extended low-bass output. Directional Characteristics The directional characteristics of the DL18MT in the 7. 4-cubic-foot TL18-1 vented enclosure were measured in ElectroVoice's large anechoic chamber. The test signal was one-third-octave filtered pink noise centered at the frequencies indicated. Beamwidth is the angle at which the horizontal and vertical polar responses have decreased in level by 6 dB when compared to the axial frequency response. The directivity factor Rq (Q) is the relative value, at a point, of the DL18MT when compared to an ideal spherical response. The directivity index, Di, is calculated by the formula: Di = 10 log10 Rq. Figure 1 Specifications: Usable Axial Frequency Response in Typical Enclosure (4. 0 ft3 tuned to 40 Hz), Swept One-Third-Octave Pink Noise, 4 Volts at 10 Feet, Anechoic Environment, Normalized for 1 Watt/1 Meter: . . . . . . 30-3, 000 Hz Power Handling Per ANSI/EIA RS-426-A 1980: . . . . . . . . . . . . . . . . . . . . . . 0. 269 OMS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 59 QTS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. 259 RE: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 0 ohms 0: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 9 % SD: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. 130 m2 (201 in. 2) MMD: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. 151 kg (0. 333 lb) LE : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 7 mH CMS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0. 246 mm/N RMS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. 08 mechanical ohms PE(max) (per ANSI/EIA RS-426-A 1980): . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 watts XMAX1: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 8. 0 ft3 tuned to 36 Hz Additional Descriptive Information, Magnet Weight: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 2 kg (4. 9 lb) Magnet Material: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barium ferrite Frame: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cast aluminum Frame Finish: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]