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The reverberation prefix "Echo" was prepared for release in 1966, presumably by the Sarapulsky plant named after
Ordzhonikidze.
The prefix is "u200b"u200ba 2 W low-frequency amplifier combined with a speaker system of two loudspeakers and a spiral unit for reverb (artificial echo).
The prefix can be used in conjunction with any sound reproducing devices or as a separate bass amplifier with a speaker system, with or without reverb.
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