Torsion-mount speaker assembly includes 4 inch driver, 70V transformer and torsion grille. The driver is engineered as a step up in sound quality and performance over standard commercial coaxial drivers, provides very high quality paging and background music reproduction for hotel lobbies, retail stores, transportation terminals, and similar venues.
PERFORMANCE
General signaling
INCLUDES
Driver (4A30): 4 inch 30W coaxial driver with 135 degree dispersion for large coverage area. Driver's capacity to deliver a wide angle of sound distribution at 2kHz with uniform response and clear audibility ensures complete coverage with minimum units. 10 oz. magnet coupled with 1 in. copper voice coil driving a polypropylene cone with half-roll rubber surround for long cone travel and good edge damping. Post-mounted, liquid-cooled tweeter is a 1 in. dia. balanced drive dome with first order high pass filter. Frequency response is 70Hz-20kHz (±6dB) and 50Hz-20kHz (±8.8dB) with a crossover at 5kHz. Frame is stamped 20-ga. steel with black enamel paint finish and zinc plated backplate.
Transformer (TLM-870): 70V with 1, 2, 4, 8W taps
Grille (WB-4T): One-piece punched steel torsion mount grille. 7.25 in. diameter. White.
COMPLIANCE & CERTIFICATION
Made in U.S.A. with global components
UL1480 listed for general signaling and UL2043 rated for use in plenum space when used with approved backbox (see below).
A&E SPECIFICATIONS
The UL Listed Standard 1480 General Signaling speaker assembly shall be Lowell Model No. WB4T-4A30-T870, which shall include 4 in. 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 in. dia. polypropylene cone and the high frequency section shall have a tweeter with a 1 in. 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 in. 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 in. 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-gauge steel with an overall diameter of 5 in. with four round and four obround holes equally spaced on 4.67 in. 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 in. dia. torsion-mount grille shall be finished in white powder epoxy paint. The assembly shall be used in conjunction with Lowell backbox Model No. DX104-T (ordered separately) to maintain UL Listing.
