Luxman 30C74 (1968)

The Luxman 30C74 is a 3-way, 3-speaker bass reflex bookshelf system. Luxman sold it in Japan from August 1968 at ¥34,000 per unit. Documentation is thin. Past the entry in Japanese audio directories, almost nothing detailed survives about its design or how Luxman positioned it.

The record does show a fairly big speaker for its era. A 30 cm cone woofer handles the low end, with crossover points at 1.5 kHz and 5 kHz splitting off the midrange and high-frequency drivers. Their specifications are not documented in any source on hand. The cabinet measures 480 × 700 × 310 mm (W×H×D) and weighs 20.4 kg. Rated frequency response is 28 Hz to 20 kHz, with a maximum allowable input of 25W, 8 Ω impedance, and a high output sound pressure level of 100 dB. Luxman described the enclosure as a "special bass reflex design," but surviving sources don't say what that means.

One 2024 Yahoo! Japan auction gives a small look at a real unit. The seller noted sound came from all drivers on both speakers, but the knobs on the rear - presumably level or crossover adjustment - produced little audible change when operated. The grilles could not be removed, so the condition of the surround edges couldn't be verified. The listing, described as "rare" and showing scratches and dirt, closed at ¥5,323 with pickup only in Yokohama.

Type: 3-way, 3-speaker bass reflex, bookshelf
Woofer: 30 cm cone
Frequency response: 28 Hz – 20 kHz
Max input: 25W
Impedance: 8 Ω
Sensitivity: 100 dB
Crossovers: 1.5 kHz, 5 kHz
Dimensions: 480 × 700 × 310 mm
Weight: 20.4 kg
Original price: ¥34,000 (one unit, August 1968)

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Luxman 30C74 (1968)

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