Electro-Voice T18 Manuals

T18 Subwoofer • DL18MT Manifold TechnologyTM woofer for reliable, extended low- frequency output • Subwoofer for augmenting the low-frequency performance of EV stage systems • Natural high-frequency roll-off • 400-watt long-term power capacity • Rugged, road-ready cabinet; metal grille; black carpet finish • Neutrik Speakon® and 1/4-inch phone jack inputs • 13/8-inch stand mount in top allows use of satellite system Impedance, Nominal: 8 ohms Minimum: 6.6 ohms Input Connectors: Two Neutrik Speakon® NL4MPR-V and two 1/4-in. phone jacks, all in parallel Supplied Accessory: Neutrik Speakon® NL4FC input cable connector Mounting: Top surface contains stand mount receptacle for use with satellite speaker system Materials, Enclosure: Black, carpet-covered 3/4-in. void-free plywood Grille: Black perforated metal Enclosure Dimensions (see Figure 3), Height: 83.3 cm (32.8 in.) Width: 63.0 cm (24.8 in.) Depth: 60.9 cm (24.0 in.) Shipping Dimensions, Height: 86.4 cm (34.0 in.) Width: 65.5 cm (25.8 in.) Depth: 65.5 cm (25.8 in.) Net Weight: 49.4 kg (109 lb) Shipping Weight: 54.0 kg (119 lb) DESCRIPTION The Electro-Voice T18 is a 400-watt subwoofer loudspeaker system which combines the at- tributes of both horn-loaded and vented-box designs. It utilizes the unique SubScoopTM cabi- net construction with a newly revised DL18MT woofer, as used in the Manifold Technology® concert systems. The design behaves like a horn over much of its range, but without the time delay and weight problems usually associated with conventional designs. Vented-box prin- ciples take over for the lowest octave and assist in producing exceptionally high levels of clean, punchy bass from a subcompact box. The reverse woofer orientation has been used to optimize the rear chamber volume and de- crease the horn flare rate for extended low-end performance. The T18 can be used to augment the bass performance of any Electro-Voice stage sys- tem. (This may involve the use of appropriate electronics and crossovers.) A 13/8-in. stand- mount receptacle on the top surface of the T18 allows satellite speaker systems such as the T52 and T22 to be used (see Figure 4). USE IN MULTIPLES The T18 may be used in multiples to increase acoustic output. A 6-dB increase in maximum acoustic output occurs when two speaker sys- tems are placed side by side and paralleled, yielding a 4-ohm load. For operation at very-low frequencies, the woofer cones “mutually couple,” acting as one system with twice the effective cone area and power-handling capacity of a single system. Increasing the cone area doubles the efficiency, providing a 3-dB increase in sound pressure level. The doubled power ca- pacity provides the potential for an additional 3-dB gain in maximum acoustic output. SPECIFICATIONS Typical Axial Frequency Response (swept one-third-octave pink noise, anechoic environment, 4 volts at 10 feet, normalized for 1 watt/1meter; see Figure 1): 45-250 Hz Low-Frequency 3-dB-Down Point: 45 Hz Usable Low-Frequency Limit (10-dB-Down Point): 33 Hz Half-Space Reference Efficiency: 6.0% Long-Term Average Power-Handling Capacity per ANSI/EIA RS-426-A 1980 (see Power-Handling Capacity section): 400 watts Maximum Woofer Acoustic Output: 24 watts Sensitivity (SPL at 1 meter, 1 watt input, anechoic environment, band-limited pink noise signal, 50 to 200 Hz): 99 dB Dispersion Angle Included by 6-dB-Down Points on Polar Responses: Essentially omnidirectional Distortion, 0.1 Full Power Input (see Figure 2), Second Harmonic, 100 Hz: –52 dB, 0.25% Third Harmonic, 100 Hz: –44 dB, 0.63% Transducer Complement: DL18MT Box Tuning Frequency: 38 Hz Recommended Crossover Frequency: 250 Hz or below Recommended Crossover Slope: 12 dB per octave