- 4″ 30W coaxial driver (4A30) has 135 degree dispersion for large coverage areas.
- Driver’s capacity to deliver wide angle sound distribution at 2kHz, with uniform response and clear audibility, ensures complete coverage with minimum units.
- Transformer (TLM-870A) is 70V with taps at 1, 2, 4, 8W
- White steel grille (WB-4T) has 7.25 inch diameter and mounts to an enclosure with a torsion spring assembly. Order enclosure separately.
- Country of origin: Assembled in U.S.A. with U.S. steel grille and global components
The speaker assembly shall be Lowell Model WB4T-4A30-T870, which shall include 4” driver, attached 70V 8W transformer and white torsion grille. The driver shall be of the coaxial type having high and low frequency transducers. The low frequency section shall have a 4” dia. polypropylene cone and the high frequency section shall have a tweeter with a 1″ dia. balanced-drive dome. A built-in electrical crossover network shall be employed to accomplish proper frequency division between the two drivers. The crossover frequency shall be at 5kHz with a 1st order high-pass filter. It shall be capable of producing a uniform audible frequency response over the range of 70Hz-20kHz (+6dB), 50Hz-20kHz (+8.8dB) with a dispersion angle of 135 degrees @ 2000Hz-6dB. The average sensitivity shall measure 88.0dB (SPL at 1W/1M). Rated power handling shall be 30 watts (EIA 426B). The low frequency voice coil shall have a 1” dia. and operate in a magnetic field derived from a ferrite (ceramic) magnet having nominal weight of 10 oz. The high frequency voice coil shall have a 0.53” dia. and operate in a magnetic field derived from a Neodymium magnet having a 0.06 oz. nominal weight. Voice coil impedance shall be 8 ohms. The frame shall be structurally reinforced stamped 20-ga. steel with an overall diameter of 5” with four round and four obround holes equally spaced on 4.688” dia. mounting bolt circle. All external metal parts shall be finished in black enamel paint or zinc plating to resist rust and corrosion. The transformer shall have primary taps at 8, 4, 2 and 1 watt and frequency response of 50Hz – 15kHz +1dB. It shall be factory-mounted to top of driver. The driver/transformer shall be mounted to a one-piece punched steel grille. The 7.25” dia. torsion-mount grille shall be finished in white powder coat paint.
