U for voice and music playback u rugged metal case u

 surface mounting and / or embedded mounting u optional line / speaker monitoring board can be installed inside u en 54-24 certified LBC 3018 / 01 speaker with rugged and fashionable metal shell can provide professional sound performance. It is especially suitable for office, school, parking lot, shopping center and other indoor places, and also suitable for dangerous areas where there may be destructive behavior. These loudspeakers are equipped with efficient dual cone loudspeakers that provide a wide frequency range for excellent voice and music reproduction. Basic functions these voice alarm loudspeakers are specially designed to be used in buildings where the performance of the voice evacuation broadcast system is required to comply with official regulations. LBC 3018 / 01 is designed for voice alarm system and meets en 54-24 standard. The speaker has built-in protection function. This can ensure that the protection of the circuit will not cause damage in case of a fire. In this way, the integrity of the system is maintained, thus ensuring that speakers in other locations can still communicate information 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. Optional line / speaker monitoring board can be installed inside the speaker. Certificate and accreditation all Bosch loudspeakers meet IEC 268-5 power amplifier capability (PHC) standard and can operate continuously for 100 hours at rated power. In addition, Bosch has conducted simulated acoustic feedback exposure (SAFE) tests to ensure that they can withstand twice the rated power in a short period of time. This ensures higher reliability of loudspeakers in extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the probability of failure or performance degradation. Safety in accordance with en 60065, emergency in accordance with en 54 ￣ 24, BS 5839 ￣ 8 and en 60849, waterproof and dustproof in accordance with en60529 IP32 regional certification European CPR EU_ CPR CE Poland cnbop installation / configuration installation dimensions in mm (in.) 2x thr 20 in mm (in.) this speaker can be mounted on the wall surface or embedded in brick wall or concrete wall. The bottom box of the speaker has optional mounting holes, so it can even be installed on the U40 and MK mounting boxes. There are two openings in the top of the bottom box for installing two cable sealing plugs to form the loop connection. For convenience, the safety cable of the bottom box allows the installation personnel to temporarily hang the front cover during installation. The surface mounted (left) and flush mounted (right) speakers have a tee junction box with screw connectors for loop wiring (including grounding). There are 4 jumpers on the matching transformer, so the user can easily select rated full power, 1 / 2 power, 1 / 4 power or 1 / 8 power (amplitude: 3 dB). 4 C 6W 3W 1.5W 0.75w - 70V C - 6W 3W 1.5W 0.75w 100V circuit diagram frequency response directivity diagram (measured with pink noise)

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