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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





Allison Model Six

 ALLISON: SIX
In the Allison: Six the Stabilized Radiation Loading design principle is carried to just about its practical limit for an 8-inch woofer.  The cabinet is reduced in size to ½ cubic foot, yet the system's low-frequency output is basically flat to below 50 Hz (-3 dB at 46,5 Hz) while maitaining reasonable efficiency. Response can be equalized flat to below 30 Hz at moderate sound levels with The Electronic Subwoofer.
 The same Convex Diaphragm tweeter as those used in all Allison loudspeaker systems is also used in the model Six. Therefore it has equivalent high-frequency range, smoothness, and the same uniquely wide dispersion in the forward hemisphere.
The model Six is intended for use with its back close to one room wall; on a shell, table, or bookcase, or mounted on the wall. The woofer panel can be oriented horizontally or vertically.
Because of the small cabinet size and the walnut-grain vinyl finish, the Allison: Six 's price is substantially below that of the model Five.
Specifications
Model Six
Speaker  Complement:
Woofer : one 8-inch (203 mm)
Tweeter : one 1-inch (25 mm )  Convex Diaphragm
Crossover Frequency:  2 kHz
Crossover Network:  LC quarter-section. Air-core choke and polyester capacitor are used. Two-position control switch (accessible from front) supplied for selection of system acoustic power response, from nominally flat to gentle HF rolloff.
Impedance:  4 Ω nominal, (3,5 Ω minimum in any balance control setting)
Efficiency:  better than 0,7% when placed with back against wall.
Minimum Amplifier Power:  15 watts per channel to produce 97 dB sound pressure level in most domestic room environments; 30 watts per channel for 100 dB SPL
Power Handling Capability:  At least 15 watts contiuous or average, at any frequency.
At least 35 watts peak at resonance frequency. Over most of frequency range, at least 350 watts for 0,1 second; 125 watts for 1 second; 60 watts for 10 seconds.
System Resonsnce Frequency:  59 Hz, nominal
Effective System Q:  1.0. Power response -3 dB at 46,5 Hz; -6 dB at 39 Hz, when placed close to center of large wall. Low-frequency output increases when system is placed in typical positions with respect to side wall and floor or ceiling
Enclosure:  stabilized Radiation Loading sealed acoustic suspension design.
Internal Volume:  14,1 litres (860 cubic inches)
Material:  particle Board veneered with walnut, oiled finish.
Dimensions (H x W x D):  286 x 286 x 286 mm (11-1/4" x 11-1/4" x 11-1/4")
Weight:  7,7 kg (17 lbs)
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