Denon SC-R55 (1987)
The Denon SC-R55 is a 3-way, 3-speaker bookshelf loudspeaker released in 1987 at ¥33,000 per unit. It's a bass-reflex design with magnetic shielding. It inherits the development concept of the larger SC-R88Z, so it carries some interesting engineering for a bookshelf box of its era.
Denon's R.M.M. structure embeds the tweeter directly into the baffle to cut vibration and modulation distortion. The cabinet uses a D.A.S. structure - porous ceramics placed on the top plate to diffuse and absorb standing waves, while adding mass to damp panel vibration. A canceling double magnet system handles shielding for TV placement. The enclosure is high-density particle board with a wood-grain finish. Frequency response is rated at 45 Hz to 45 kHz, impedance 6 Ω, maximum input 150W (EIAJ), sensitivity 90 dB/W/m, with crossovers at 1500 Hz and 10 kHz. Dimensions are 275 × 490 × 262 mm (W×H×D) and each speaker weighs 13.5 kg.
The record on this model is thin. No production end date, no period reviews and no detailed market history survive in the sources available. What little reception exists comes from a single Russian resale listing, where the seller praised the bass as surprisingly deep "not in proportion to size." Another listing in Yakutsk asked 20,000 rubles and described the pair as rare. One Yahoo Japan auction unit was noted as being in overall poor condition.
- 3-way, 3-speaker, bass-reflex bookshelf, magnetically shielded
- 22 cm cone woofer (New Cross Carbon), 8 cm cone midrange (carbon olefin), 1.6 cm hard dome tweeter (ceramic-coated)
- 45 Hz – 45 kHz, 6 Ω, 150W max (EIAJ), 90 dB/W/m
- Crossovers at 1500 Hz and 10 kHz
- 275 × 490 × 262 mm, 13.5 kg each
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