Technics - National SB 400 - Speaker set

Very popular rare speakers from 1971 from the brand National. These also came on the market under the banner Technics. Description: Speaker system with the theme of the multi-cell horn, its function was to improve the transient response and directional characteristics. 25 cm cone type woofer high-compliance type. Improving linearity and force treatment through the convex and concave back edge. Horn type squawker for the mid-range, 8 cell, this is distributed vertically and horizontally for better directional sensitivity. Horn type tweeter formed by a multicellular horn, 6 cell. This can be switched with an attenuator in high and medium range. Switching can be done in 3 phases. It concerns a closed housing which is finished with teak veneer. This is treated with wax. Multi amplifier connections, mode selector switch, can be operated by multiple amplifiers 2-fold/3-way. Specifications 3-way, 3 speakers in closed cabinet. Low-pass woofer: 25 cm cone On average: horn type Tweeter: horn type Frequency range: 35Hz ~ 20,000 Hz Impedance: 8 ohms Output sound pressure level: 98 d. B/W/m Allowed input 38 W. Crossover Frequency: 650Hz~ 6000 Hz. H 590 mm W 316 mm D 300 mm Weight 12 kg each