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Surprise subscriber loudspeaker, presumably since 1965, has been producing the Novosibirsk low-voltage equipment plant. Surprise is designed to receive broadcast programs transmitted over broadcast networks. The range of sound frequencies is 150 ... 5000 Hz. The brought power is 0,15 W. Dimensions AH - 245x140x55 mm. Weight 1.1 kg. AG "Surprise" was produced with slight differences in appearance, overhead grilles, volume control knobs. Since 1978, the plant began producing a Surprise-301 subscriber loudspeaker, which was produced not according to GOST, but according to the technical specifications for operation in a radio line with a voltage of 30 or 15 volts and had slightly different frequency characteristics, 160 ... 6300 Hz.