Onkyo U-6000 (1971–1972)
The Onkyo U-6000 is a three-way, three-driver, sealed bookshelf speaker from the early 1970s. It belongs to Onkyo's U-series and is listed within the broader Scepter model family. It was priced at ¥36,800 per unit around 1971 and ¥38,600 per unit around 1972, with production running roughly 1971 to 1972. It's a big bookshelf box at 400 × 680 × 330 mm and 20.5 kg each, and it was built to be driven hard.
The driver lineup is what sets the U-6000 apart. A high-compliance 30 cm paper cone woofer with a cloth surround handles the low band. The midrange and the high frequencies both come from sectoral-shaped horn-type units. Onkyo claimed this horn arrangement reduced restrictions on listening position and gave broad directional characteristics. The woofer cones were made from Finnish pulp with aluminum foil bobbins, and the enclosure is hermetically sealed. Rated frequency response is 35 Hz to 20 kHz, with the lowest resonance at 55 Hz, crossovers at 700 Hz and 6.5 kHz, and an impedance of 8 Ω. Allowable input is 25 W, with 50 W maximum. Output sound pressure is rated at 100 dB/W measured at 50 cm, not the more common 1-meter standard. It's still an unusually high figure, and it reflects the horn-loaded upper registers.
Because of that high sensitivity, Russian-language seller commentary notes the U-6000 can work well with low-power amplifiers, including tube designs. One listing called them "very cool" and "rare with luxurious sound," with grilles reupholstered at some point. Another described the sound as "good, no distortion, good detail on all frequencies" and said they "play loud and clean." A 2014 listing asked 25,000 rubles and mentioned a puncture on a driver surround.
Documentation on the U-6000 is thin. No detailed period reviews, crossover schematics, or cabinet construction details have surfaced. The main specification record rests on a single Japanese database, with corroboration from Russian marketplace listings.
- Type: 3-way, 3-speaker, sealed (airtight) bookshelf
- Woofer: 30 cm cone, paper with cloth surround
- Midrange / tweeter: horn-type units
- Frequency response: 35 Hz – 20 kHz
- Crossover: 700 Hz, 6.5 kHz
- Impedance: 8 Ω; Input: 25 W nominal / 50 W max
- Output sound pressure: 100 dB/W (at 50 cm)
- Dimensions: 400 × 680 × 330 mm; Weight: 20.5 kg each
- Original price: ¥36,800 (1971) / ¥38,600 (1972), per unit
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