Exhibitors Herald World (Oct-Dec 1929)

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October 26, 1929 EXHIBITORS HERALD-WORLD 55 THE BOWL SPEAKER Electrodyn ami c 10" Cone Speaker, Stonite Bowl. 6 feet in diam* eter, 1 8" deep, weight 5 7 5 pounds net. List Price $490.00 r*-» A.N entirely new conception in theatre speaker design has been developed by our Engineering Department. This new UNI-DIRECTIONAL design combines all of the desirable features which have been recognized in both the air-column and the dynamic type of speaker, without the contingent disadvantages which are present when each is used separately. The radically new design of the Operadio Electrodynamic Chassis has made it possible to produce this UNI-DIRECTIONAL speaker which now harnesses the energy which comes off the back of the Electrodynamic Speaker — which normally was wasted — and expands this energy in a proper manner and projects it out of the front of the speaker in such a way that it practically doubles the efficiency by absolutely eliminating back stage acoustics* UNI-DIRECTIONAL BOWL SPEAKER This Speaker is designed primarily for use in theatres which are approximately square in lay-out. Because of its tremendously large size, the "wave front" which it produces makes it possible for the volume to carry to the very back of the house with sufficient clearness, without objectionable loudness for those in the front seats. Because of its reflecting type design, music and voice may be clearly and distinctly understood through an arc of 160° in front of the speaker. In most cases, it is possible to obtain satisfactory volume with the use of only one of these speakers, behind a talking screen. It reproduces both high and low frequencies faithfully, which eliminates the barrel-like tone found in so many speakers. Makes the talking part of the movies a pleasure to listen to. UNI-DIRECTIONAL ELECTRODYNAMIC AIRCOLUMN SPEAKER This speaker has all the advantages of the Bowl Speaker but is designed primarily for theatre work where a long narrow house presents acoustical difficulties by reason of reverberations between the walls. It is more directional, and for that reason suits this type of house ideally. The design permits the higher frequencies to be radiated direct from the front of the cone itself, while the lower frequencies which come off the rear side of the cone traverse the air-column. The combination of these two in the mouth of the speaker gives this speaker excellent carrying characteristics. Bass notes are not overemphasized. ELECTRODYNAMIC AIR. COLUMN SPEAKER Electrodynamic 10" Cone Small Size Model S, list $)00.00 Medium Size Model M, list $440.00 Model 341-D Operadio Fader OPERADIO FADER No. 341-D A 12 contact point type Fader furnished either with or without dummy, as illustrated. Unlike the usual potentiometer type, each contact represents a definite wire wound resistance insuring at all times a constant and positive increase or decrease of amplifier input voltage. It is not subject to deterioration with use or fluctuation in value due to temperature or weather changes. Can be used with either disc or sound-on-film equipment. List price, single Fader No. 341 $ 76.5 0 List price, Fader No. 341-D (with dummy) $125.00 OPERADIO OPERADIO MFG. COM PAN Y • $T.CHARLE$,I LL.