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L? b1 uw12-x is an affordable 12-w universal speaker for indoor applications. The keyhole on the back panel is convenient for quick and easy wall installation. The front baffle is tilted at an Angle to give the listening area better sound. The speakers come in black or white. The MDF (medium density fiberboard) housing has a solid base function and is covered with durable and easy-to-clean vinyl film, providing both white and black styles. The front panel is made of ABS material and is covered with fine color matching speakers. The front baffle is tilted at an Angle to improve the high frequency playback effect in the listening area. All Bosch speakers are certified to meet IEC 268-5 power handling capacity (PHC) standards and can operate continuously for 100 hours at rated power. Bosch has also conducted simulated acoustic feedback exposure tests to ensure they can withstand twice the rated power in a short period of time. This ensures high reliability in extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the chance of failure or performance degradation. Three key holes in the panel after installation/configuration in accordance with EN 60065 standard allow users to install walls easily and quickly. The rear panel is equipped with convenient and easy to use four-way push - in junction box, suitable for field wiring. The junction box is connected by a 100v transformer pick-up power tap in the sound column. This allows the user to select the rated full power, half power, or quarter power radiation (increase by 3 dB). Size (unit: Mm) ~ ? circuitry frequency response horizontal directivity diagram (pink noise is used to measure the vertical directivity diagram (using the pink noise measurement) technical specifications Electrical specifications 18 W * maximum power rating 12/6 of 12 W / 1 W / 3 W sound pressure level (1 kHz, 1 meter) 104/93 dB (SPL) effective frequency range (10 dB) 160 Hz and 20 kHz open Angle 1 kHz / 4 kHz (6 dB) level 195 ° 95 ° 69 ° vertically / 17 ° rated input voltage 100 V rated impedance of 833 ohms interface 4 needle into the junction box * technical performance data accord with IEC 60268-5 standard mechanical size (high x width x) 441 x151x150/111 mm (17.4 x5.9 x5.9/4.4 inch) weight 2.5 kg (5.5 lb) color black (D) or (L) speakers/white cloth (D) accord with standard of RAL 9004 amp/fabric (L) RAL 9010 / RAL 7044 standard working temperature environment specification - 25 DHS to 55 DHS C + C (13 ° F to 131 ° F) + storage temperature and 40 ° C to + 70 ° C (40 - DHS F Relative humidity <95% order information LB1? uw12-d speaker box, 12 W, front cover MDF shell with fine woven cloth, black coating, and 3 key holes for wall installation. Lb1-uw12-d lb1-uw12-d lb1-uw12-l speaker box, 12w, front cover MDF shell with exquisite woven cloth, white coating, with 3 key holes for wall installation. Order number LB1 - UW12 - L