Denon SC-31V (circa 1986)
The Denon SC-31V is a compact, 1-way sealed bookshelf speaker from the mid-1980s, sold mainly in Denon's domestic Japanese market. It's a small, plain design built around a single 8 cm full-range cone driver. It has an anti-magnetic shield, so it can sit near a CRT television or other video equipment.
Documentation on the SC-31V is thin. No period reviews or detailed design write-ups have turned up. The record does show a modest, practical little speaker: 8 Ω impedance, 15W maximum continuous input (30W instantaneous), a frequency response rated from 100 Hz to 20 kHz, and a mean output sound pressure of 87 dB. The sealed enclosure is particle board. It shipped with a flexible stand that could be fixed in place, wall-mounted, or adjusted for elevation angle. The original price was ¥6,150 per unit around 1986.
The spec sheet gives two sets of dimensions, with and without the stand. The body alone measures 110 × 153 × 108 mm (W×H×D). With the stand attached it's 124 × 170 × 108 mm. Packing weight was approximately 2.5 kg.
A used listing on a Japanese auction site described the SC-31V as an "ornament speaker" for AV pairs and monitor surround use. That suggests these were often picked up as secondary or surround channels rather than primary listening speakers, which fits the small driver and modest power handling.
Known specifications
- Type: 1-way, 1-speaker, sealed bookshelf, anti-magnetic
- Driver: 8 cm cone (full-range)
- Frequency response: 100 Hz – 20 kHz
- Impedance: 8 Ω
- Maximum input: 15W continuous / 30W instantaneous
- Output sound pressure: 87 dB
- Dimensions (body): 110 × 153 × 108 mm (W×H×D)
- Dimensions (with stand): 124 × 170 × 108 mm
- Weight (packed): approx. 2.5 kg
- Enclosure: particle board
- Original price: ¥6,150 (per unit, circa 1986)
Everything above comes from a single Japanese audio database entry and a Vietnamese speaker listing. They agree on all shared specs. No other sources have turned up.
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