The l30bc 99/41 is a speaker built into a ceiling and is suitable for applications that require high power efficiency, such as a room with a high ceiling. It can provide a high sound pressure level and a wide range of frequencies, thus ensuring excellent speech clarity and high music reproducibility. It can be used in many applications, such as stores, multi-storey department stores, schools, offices, sports fields, liquor stores and restaurants. Basic function LBC 3099/41 adopts integrated 24-watt speaker with double tone basin. A 100 V matching transformer is installed on the back. The front is fitted with a beautiful metal mask and is covered with a plain white RAL 9010 coating. Voice alarm loudspeaker the voice alarm loudspeaker is specially designed to be used in buildings with many strict requirements for the performance of the voice evacuation broadcasting system. L30bc 99/41 is designed for voice alarm system and conforms to emergency standard. The speaker has built-in protection. In case of a fire, this protection ensures that the damage to the loudspeaker does not result in the failure of the circuit connected to it. In this way, the integrity of the system is maintained to ensure that the loudspeakers in other locations can still communicate to people in a timely manner. The loudspeaker is equipped with a ceramic junction box, a temperature fuse and a heat-resistant high-temperature conductor. In addition, it can be equipped with optional LBC 3082/00 fireproof cover to enhance the protection of cable terminals. 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. Safety compliance EN 60065 emergency compliance BS 5839-8/EN 60849 collision prevention compliance DIN VDE 0710 part 13 standard regional certification European CE