Technics SB-1750 (c. 1978)
Little is documented about the Technics SB-1750. The record shows a 3-way, three-driver bookshelf speaker system from around 1978, priced at ¥25,800 per unit in Japan. The woofer is a 25 cm cone made of specially processed corn paper, the one design detail that survives in the sources. It is joined by a 10 cm cone midrange and a 6 cm cone tweeter, all running through a 12 dB/octave crossover network.
The known specs are 8 Ω impedance, 92 dB/W/m output sound pressure level, 60W max input, dimensions of 370 × 725 × 311 mm, and a weight of 15.0 kg. No frequency response figures, crossover points, exact production years, or period reviews have surfaced. Beyond this spec sheet, the SB-1750 is close to a blank page.
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