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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





Electro-Voice SP15 loudspeaker

Electro-Voice Models SP-15 (and SP15B) are massive, 15-inch reproducers of deluxe construction. They offer outstanding performance as full-range loudspeakers or as low-frequency drivers in mutiway systems. The EV Radax coaxial principle employed in these speakers offers as extended high-frequency response beyond the normal capability of ordinary 15-inch loudspeakers; and the combination of outstanding magnetic structure, edgewise wound voice coil, and viscous-damped cloth cone suspension makes possible an unusually low cone  resonance and extended low-frequency response.

The Model SP15 incorporates an exclusive E-V circuit which dramatically improves high-frequency response through control of speaker impedance at high frequencies. Action of this unique circuit and adjustment of the speaker's high-frequency response is determinate by the setting of an auxiliary brilliance control.

 


SP15 Brilliance Control

Since the Model  SP15 was introduced several years ago, a number of improvements have been made in its design. Among the most effective is the additions of a brilliance control to allow adjustment of the speaker's high-frequency response to individual taste and room acoustics. The best guide to setting this control properly is, of course, a familiarity with the sound of live music. Acoustically "hard" or "live" rooms will require a retraed setting of the brilliance control to compensate for the greater amount of high-frequency reflection. In "soft" or "dead" rooms with soft furniture, carpeting, and draperies a more advanced setting of the high-frequency control will normally be required.

 


Specifications

Frequency Response:  25 - 15,000 Hz

Impedance:  8 Ω 

Power Handling Capacity

Program :  40 watts

Peak :  80 watts

Voice Coil Diameter:  2,5 -inch

Magnet Weight:  4 lb 10 oz

Magnet Material:  Ceramic

Nominal Cone Resonance:  25 Hz

Mechanical Crossover:  3500 Hz

EIA Sensitivity Rating:  53 dB

Dimensions

Diameter :  15-1/8" (8-1/4: d. overall)

Mounting:  14-7/16" diameter (four 1/4" holes equally spaced on circle)

Baffle Opening:  13-1/2"

Net Weight:  25 lbs


 

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