Allison Model Five

 ALLISON: FIVE

Introduced in 1976, the Allison: Four loudspeaker  system established a new standard of performance for  "bookshelf" systems of its size and price. It has still not been fully equalled. But the Allison: Five system now offers very nearly the same performance as the Four at a significantly lower price.

Both have an 8-inch long-excursion woofer in a cabinet of moderate size. Low-frequency performance is identical; Stabilized Radiation Loading design enables the systems to deliver bass power to a listening room that is essentially flat (-3 dB) to 41 Hz . This can be extended to 20 Hz at reasonable sound levels with The Electronic Subwoofer equalizer.

 The Allison: Five system has a single Convex Diaphragm tweeter, as compared with two in the model Four. With only one tweeter the cabinet is a simple rectangular shape, less costly than that of the Four, which provides a further saving. The only performance compromises are a slight reduction in high-frequency power handling capability and slighty less high-frequency dispersion. In both respects, however, the model Five is significantly better than competitive speakers.

Balanced for use close to one room wall, the Allison: Five cabinet can be put on a table or a shelf, or mounted on the wall. It can be oriented with its long dimension either horizontal or vertical.

SPECIFICATIONS

Model Five

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:  52 Hz, nominal

Effective System Q:  1.0. Power response -3 dB at 41 Hz; -6 dB at 34,5 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:  20,73 litres (1,265 cubic inches)

Material:  particle Board veneered with walnut, oiled finish.

Dimensions (H x W x D):  279 x 464 x 254 mm (11" x 18-1/4" x 10")

Weight:  9,5 kg (21 lbs)