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The Bosch high efficiency horn speaker provides superior voice reproduction and sound transmission efficiency and is suitable for outdoor applications. They are ideal for sports fields, parks, fairs, factories and swimming pools. An overview of the system This series contains two round horn, opening diameter is 355 mm (14 inches) respectively and 490 mm (20 inches), and also contains three exciter, 25 W, 35 W and 50 W, respectively. Assemble horn and driver (individually ordered) together to form an integrated horn loudspeaker. Using this method to assemble horns and actuators, lbc3472/00 and lbc3478/00 are equivalent to integrated horn speaker lbc3482/00. The assembly combination of lbc3473/00 and lbc3479/00 is equivalent to the integrated horn speaker lbc3483/00. The assembly combination of lbc3474/00 and lbc3479/00 is equivalent to the integrated horn speaker lbc3484/00. The horns lbc3478/00 and lbc3479/00 are made of aluminum material, and the edges of the horns are covered with PVC profiles to prevent damage from impact. The actuators lbc3472/00, lbc3473/00 and LBC 3474/00 have aluminum internal cones and steel mounting brackets are provided with the attachment. The rear cover of the actuator device is made of ABS flame retardant material (in accordance with UL 94 V 0 standard). Horns and actuators are painted in a light gray color, RAL 7035. Note in order to reduce packaging size and cost, 6 packages per box for actuators and horns. Therefore, the minimum order quantity is 6 exciters and 6 horns. The actuator and horn are ordered separately. Certificate and approved quality guarantee that all Bosch speakers meet IEC 268-5 power handling capacity (PHC) standard 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 a higher reliability of the speaker under extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the chance of failure or performance degradation. Safe in accordance with EN 60065 standard, waterproof and dustproof comply with IEC 60529, IP 65 standard and emergency in accordance with EN 54-24 / BS 5839-8 standard