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L30bc 90/01 is a kind of economical and practical embedded smallpox speaker for general application. It is a widely used loudspeaker for transmitting voice and music in stores, warehouses, schools, offices, gyms, hotels and restaurants. The basic function LBC 3090/01 is equipped with a 6 W speaker with a double tone basin. The 100v matching transformer is installed behind the front panel component. The front panel of the molded plastic is mounted on the metal frame of the speaker and a dust cover is attached to the back. Its appearance and color can be incorporated into any indoor environment. 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 of the speaker under extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the probability of failure or performance degradation. All plastic parts are made of high strength ABS flame retardant material (in accordance with UL 94V0 standard). Security in accordance with EN 60065 standard certification European CE installation/configuration speaker built-in two spring locking clip, can card into the ceiling (9 to 25 mm thickness for ceiling and wall panel) on the mounting holes, so can they can quickly and easily for installation. In addition, four screws (with pre-drilled holes) can be used to hold the speaker to a ceiling or wall plate no thicker than 9mm. The circular template accompanying the speaker is used to mark the hole with a diameter of 182 mm (7.1 inch). The junction box loudspeaker is equipped with a two - way terminal box with push - in connector. Match the three primary coil jumper connectors on the transformer for selecting rated full power, half power, or quarter power (increment 3 dB). If the l30bc 91/01 surface mount box is to be installed on the wall or ceiling surface, you can use the color matching LBC 3091/01 surface mount box.