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"Square type horn speakers for controlled directivity. Made of aluminium, they are easy to install. 8 Ohm impedance for direct matching to standard amplifiers. A voice coil is a tightly wrapped coil of wire attached to a speaker driver, s diaphragm and situated in close proximity to a stationary magnet; electromagnet that generates a magnetic field when current passes through it thus being repelled or attracted by a speaker driver, s magnet and creating motion.Specification: Type: Square, Input power (RMS): 40W, / Impedance: 8 Ohm, Freq. response: 250~7 kHz, S.P.L: 105 dB, Material: Aluminium, Dimensions (LxWxH): 357 x 365 x 228 mm, Weight: 2,0 kg"