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Radio Record, Volume II, Issue 11, 28 September 1928, Page 11

N Australian expert says: "With the possible exception of microphones of the capacity type, no device produced in the last three years has contributed more to the improvement of the quality of broadcast music than the new dynamic cone loud speakers, which first made their appearance more than a year ago in certain electrically operated gramophones and have since been adapted for ordinary -proadeast reception. Kliminating alike most of the faults of the horn speaker and earlier forms of cone speakers, the dynamic cone is capable of giving reproduction of a quality which cannot be equalled by any other producing device, and unless some further striking development in wireless reproduction occurs there can be no doubt that this speaker is likely to be in a few years one of the most widely used of all reproducing instruments."