The Fisher XP-4 represents a totally new approach in loudspeaker design. It is the world’s first loudspeaker system in which the conventional metal frame supporting the outer edge of the bass speaker cone has been completely eliminated. This structure is often the source of undesirable reflections from the back of the cone, causing uneven frequency response and unnatural coloration of the sound. It is also vulnerable to parasitic vibration.
In place of the metal speaker frame, the Fisher XP-4 utilizes the heavy walls of the cabinet itself as a massive supporting structure for the bass speaker cone. Reflections are eliminated by packing the space behind the bass speaker cone with AcoustiGlas. Cone break-up has been eliminated by designing the cone as a rigid piston. The combined result of these advanced-design features is a low and middle-frequency sound that recreates the original in thrilling clarity, without a trace of ‘speaker tone’. Only the music itself is reproduced.
The Fisher XP-4 reflects, in its every aspect, the precision engineering that brought it into being, and that has made it possible to produce this novel design with such complete success. It will set the standard in speaker design for years to come.
XP-4 SPECIFICATIONS
Total of four speakers: 12″ woofer with two-inch voice coil. Two 5″ mid-range speakers (AcoustiGlas packed to eliminate cone breakup). One two-inch hemispherical high-frequency unit, covering an angle of 120 degrees assuring non-directional treble. Infinitely variable Balance Controls for middle and high frequencies. Professional type, three-way crossover network uses heavy air-core coils and oil filled condensers for elimination of distortion at crossover frequencies. Impedance: 8 ohms. Dimensions: 12 1/2″ front-to-back x 24 1/2″ x 14″.