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The electro-acoustic unit "Accord-M" since 1972 was produced by the Smolensk plant "Centaur". Designed to enhance the sound of plucked instruments, as well as signals from the pickup, tape recorder, receiver or radio. Power supply of the unit is carried out from a special battery pack or from the electrical network through a power supply unit inserted in place of the battery pack. The nominal output power of the amplifier when powered by batteries is 2.5 watts from the mains - 3 watts. The frequency range reproduced by sound pressure is no longer 80 ... 10,000 Hz, voltage 60 ... 12000 Hz. The dimensions of the unit are 290x140x445 mm. Weight without power compartment 4 kg.