Diatone speaker DS 37B, The Diatone DS-37B is a vintage 3-way, sealed-box bookshelf speaker system released in Japan in 1980. It features a 32 cm cone woofer, a 10 cm cone mid-range driver, a 4 cm titanium alloy semi-dome tweeter, 6 Ω impedance, a 30 Hz–30 kHz frequency response, 80W max input, and weighs 24 kg per speaker. [1] General Specifications System Type: 3-way, 3-speaker, airtight (sealed) bookshelf system [1] Release Year: 1980 (Original price: ¥59,800) [1] Nominal Impedance: 6 Ω [1] Playback Frequency Band: 30 Hz – 30,000 Hz [1] Crossover Frequencies: 600 Hz and 5 kHz [1] Output Sound Pressure Level (Sensitivity): 91 dB/W/m [1] Maximum Input Power: 80 W [1] Dimensions (W x H x D): 370 x 680 x 380 mm [1] Weight: 24 kg (53 lbs) each [1, 2]