04 June 2022

Technics SB-7000 (1975) - "Linear Phase" Speaker System

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This Classic model was released in Japan in 1975 and it was simply called Technics7. Later, when it was added to their export program it was renamed SB-7000. In order to obtain linear phase response, the travel time of the sound from the speaker to the listener must be the same for each driver. The Technics SB-7000 therefore is built with its drivers staggered in such a way that their acoustic centers are equidistant from the listener's position. Technics developed three drivers of very, very wide frequency range to be used in the SB-7000, so that only the linear phase portion of each driver's range could be combined in a 3-way system of exceptionally linear overall phase response. The woofer is an extra-large 35cm triple-layer TC cone with blended aramid fibers to reduce doppler effect distortion. The 12cm midrange driver uses the same TC/aramid fiber-blended cone structure. The 32mm dome tweeter is a special high efficiency, low distortion dome driver, using a rectangular-shaped magnet, and a special dome-shaped diaphragm of heat-molded expanded polyurethane on a silk cloth base. 

The midrange unit operates in a sealed and damped enclosure while the woofer is loaded by two resistively-coupled cavities occupying the volume of the main cabinet leading out to a slot port below. The crossover unit is mounted at the rear of the midrange unit. The standard SB-7000 came with black grilles and black laminate surfaces with simulated wood for the side. Two more versions existed, the SB-7000MP with real wood veneer on the sides and the SB-7000W all white with green grilles. All versions are equipped with heavy duty carrying handles and protection bars around the woofer grille. Technical Specifications: 3-way 3-speaker bass reflex | Impedance 6 ohm | Instantaneous maximum input power 150W | Crossover frequencies 700Hz, 6kHz | Frequency range 37Hz-22kHz (-10dB) | SPL 90.5 dB/W (1m) | Dimensions 480x845x410 | Weight 33kg.

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