The Bosch LBC 3428/00 horn speaker is specially designed to achieve excellent sound reproduction in Marine applications and other industrial environments. It is strong and durable, waterproof and dustproof, and can effectively prevent corrosion of sea water and most industrial environments. In addition, it applies to a fixed system, also applies to mobile system, and it has strong power and good sound performance, therefore or ordinary ideal for commercial and industrial applications. Basic function the horn loudspeaker is made of glass reinforced polyester (GRP) material with uv resistance. This kind of high-strength refractory and anti-corrosion material has excellent reliability and greatly reduces the maintenance cost. In addition, GRP has excellent chemical resistance and thermal stability, making it easy to cope with various applications, including the worst environment. The horn loudspeaker is weatherproof and integrates stainless steel mounting bracket with cover screw to further enhance corrosion resistance. They are equipped with two 20mm seal plug entrances (standard with a seal plug) for easy loop connection. All Bosch loudspeakers are certified to meet IEC 268-5 power amplifier (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 higher reliability in extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the chance of failure or performance degradation. Security in accordance with EN 60065 standard waterproof and dustproof conform to IEC 60529, IP 66 and IP 67 standard certification European CE installation/configuration, horn speaker built-in transformer primary winding the jumper wire on the power can be used in different Settings. The horn loudspeaker is equipped with a strong mounting bracket to allow sound to be broadcast in the right direction. The bracket is equipped with ratchet device to ensure correct positioning. Size (unit: Mm [in]) transformer jump line 15 W power general phase 1 2, 3, 4, 2, 3, 15.0 15.0 5.0 5.0 4.0 4.0 2 3 4 1 4 circuit frequency response directivity pattern (use pink noise measurement) 125 Hz, 250 Hz, 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz SPL - 79 1.1 79 10 2 5 98 SPL (most) 87-87, 108 11, 11 11 0 99 Q - 1.5 1.9 3.2 6.8 15. 8 51. The efficiency of 3-0.07 2.7 6.2 5.9 0.5 0.1 level Angle of 16-360 360 0 360 to 55 vertical Angle of 25 degrees 16 0 90 to 55-360, 360 the acoustic characteristics of the 25 per octave attachment number 1 3428/00 LBC horn speaker cable seal component technical specifications Electrical index * maximum power 22.5w rated power 15/7.5/4/2/0.8 W sound pressure level 15w / 1 W (1 kHz) 1 meter) at 114 dB/dB (SPL) 102 (10 dB) 380 Hz frequency range of 1 kHz to 5.5 kHz open Angle / 4 kHz (6 dB) 55 ° 160 ° / rated voltage 100 V rated impedance of 667 ohms connector screw terminal box * technical performance data in accordance with IEC 60268-5 standard mechanical index size (diameter x [largest]) 245 x 163 mm (9.6 x 6.4in weight 2.6kg (5.72lb) light grey RAL 7035 cable diameter 8mm to 12mm (0.31in to 0.47in)