Giant Speaker.
HE question of radio music for theatres is one which has been before theatre managers for some time and has recently been solved by an American who has introduced a huge balsa wood loud-speaker. This monster, measuring 6ft. by 9ft., operates in «i New York Theatre, where it successfully dispenses with an _ orchestra Which was costing £175 a week to maintain. The power amplifier in the circuit attached to this speaker, has a single stage of audio frequency equipped with two 250-watt transmitter valves. The plate circuit is supplied with current of a potential of 1500 volts. The speaker can be placed in the orchestra pit or can be mounted on a special drop curtain. It can be operated by being tuned in to wireless signals, or from a gramophone pick-up.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280928.2.48.8
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Radio Record, Volume II, Issue 11, 28 September 1928, Page 15
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133Giant Speaker. Radio Record, Volume II, Issue 11, 28 September 1928, Page 15
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