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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Tannoy GRF Autograph Enclosure

As a fitting complement to the Tannoy "Fifteen" Dual Concentric Unit, our Research Laboratories now give you the expanding source Loudspeaker System. This unique enclosure embodies all of the well-known advantages of Horn Loading, e.g., excellent bass radiation and transient response, but suffers from none of the special distribution defects associated with conventional Horns. The overall efficiency of the system is also high with the result that not more than 3 watts peak are required for even the largest living room. The effective source size of the system varies with frequency, below 200 c.p.s. the L.F. Diaphragm of the Dual Concentric is horn loaded both front and rear; from 200 c.p.s. to 1,000 c.p.s. the front loading only is effective, thus giving a reduction in apparent source size. Above 1,000 c.p.s. the horn loaded high frequency unit integral with the Dual Concentric commences to radiate giving all of the advantages of a small non-directional source. The result of this entirely new form of horn loading is that while large orchestral and choral works have a sense of spaciousness and breadth, chamber music and solo vocal music possess that intimacy very necessary for their full enjoyment. Once again the Tannoy organisation with over a quarter of a century's experience in Sound Reproduction have produced a Loudspeakers System by which others will be judged.

Specifications

Power handling Capacity: 50 watts (integrated programme material)

Frequency Range: 30 cps - 20,000 cps (30 HZ - 20,000 Hz) ±4 dB

Conversion Efficiency: In excess of 20% over entire range. (four to five times that of conventional systems)

Rear Horn Development: Effective 20 cps - 250 cps

Front Horn Development: Effective 250 cps - 1,000 cps

Polar Distribution 60° inc. Angle: - 4 dB at 10,000 cps

Overal Dimensions:

Height: 4 ft. 10½ in.

Width at walls: 3 ft. 7 in.

Frontal width: 29½ in.

Depth (front to corner): 26½ in.

Finish: Hand rubbed mahogany, walnut or oak. Wide choice of contemporary easy-clean plastic fabrics.

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