Subscriber loudspeaker "Sirius-301".
Subscriber loudspeakers.DomesticSubscriber loudspeaker "Sirius-301" since 1976 Izhevsk radio plant. The subscriber loudspeaker "Sirius-301" is a standard subscriber loudspeaker for radio transmission lines with a voltage of 30 V. The range of reproduced sound frequencies is 160 .... 6300 Hz. Sound pressure in the reproducible frequency band is 0.25 Pa.
