Denon SC-30 (circa 1986)
The Denon SC-30 is a compact, self-powered speaker with a "paperback book-sized" sealed enclosure and a built-in amplifier. It was sold as a single unit, not a stereo pair, and priced at ¥7,500 per unit around 1986. Documentation is thin. The record is mostly period spec listings and the occasional secondhand listing, but it's enough to show a small, cleverly designed desktop speaker.
Each SC-30 has an 8 cm full-range cone driver in a sealed particle-board cabinet, with the amplifier built right into the enclosure. The amp is rated at 5W and has a low-frequency enhancement circuit. Rated frequency response is 80 Hz to 20 kHz. A switch selects between "SP. Direct" and "Amp. In", which is unusual for the size and era. In one position the SC-30 works as a conventional passive speaker. In the other it runs as a powered unit fed directly from a line-level source. The cabinet came in three colors: black, red, and silver. It also has a magnetic protection design, so it's safe near CRT displays.
The AC adapter was sold separately. Denon offered two official accessories: the ASG-101 speaker grip (two per set, ¥12,000) and the ASG-50 tabletop stand (two per set, ¥5,800). External dimensions are 110 × 153 × 108 mm (W×H×D), and packed weight is approximately 2.2 kg.
Collectors should know that sources conflict on impedance and power handling. The primary Japanese spec database lists 4 Ω impedance and a 15W maximum allowable input. A Korean listing claims 6 Ω and 100W maximum. That 100W figure almost certainly refers to a different model or is a listing error. With a built-in 5W amplifier, the 4 Ω / 15W figures from the spec sheet are far more credible.
Surviving information on the SC-30 is thin. There are no production years beyond the circa-1986 price attribution, no period reviews, and no documented common failures or maintenance concerns. It was a small Japanese design that offered unusual flexibility for its class, and it turns up on the secondhand market now and then.
- Type: 1-way, 1-speaker, sealed bookshelf system with built-in amplifier
- Driver: 8 cm cone (full range)
- Amplifier output: 5W (with low-frequency enhancement circuit)
- Rated input: 600 mV / 120 Ω
- Frequency response: 80 Hz – 20 kHz (via built-in amp)
- Impedance: 4 Ω
- Dimensions: 110 × 153 × 108 mm (W×H×D)
- Weight: approx. 2.2 kg (packed)
- Finish: black, red, or silver particle-board cabinet
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