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Bosch planar speakers and their accompanying installation boxes are especially suitable for embedded audio applications in stores, department stores, schools, offices, hotels and restaurants. Like all Bosch public broadcasting systems and components, the flat panel loudspeaker also adopt strict standards, exquisite manufacture process, to ensure that in every way to the fine quality and guarantee optimal compatibility. Basic features 6w flat panel speakers with a low frequency speaker and a high frequency speaker provide exceptional speech clarity and music playback. They may or may not provide integrated volume control (LBC 3011/51 and LBC 3011/41, respectively). Through 2 pin screw connector can be connected to 100 V line road joint on corresponding jump line matching transformer, which will be rated output power for full power, 1/2 power 1/8, 1/4 power or power (amplitude: 3 dB). The white (RAL 9010) planar panel loudspeaker is made by injection of fireproof high-strength ABS material (in line with UL 94V0 standard). They are equipped with a beautifully designed metal perforated mask. This flat-panel speaker can be embedded in a rectangular opening in a hollow wall, ceiling, furniture or custom cabinet. There is also room on the back for the installation of an optional line/speaker monitor. 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 areas 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. Certification and certified voice alarm speakers are specially designed to be used in buildings that have many stringent requirements for the performance of voice evacuation broadcast systems. L30bc 11/x1 is designed for voice alarm system. Safety in accordance with EN 60065 standard emergency BS 5839-8 standard flame retardant UL 94 V0 standard