Denon SC-R11 (c. 1987)
The Denon SC-R11 is a compact 2-way bookshelf speaker from around 1987, originally priced at ¥22,000 per unit. It is a bass-reflex design with magnetic shielding, so it can sit near a TV or computer monitor without disturbing the picture. That was a practical touch for its era.
The engineering is more interesting than the modest price suggests. Denon used an 18 cm cone woofer with a carbon olefin diaphragm (chopped carbon fiber mixed in) and a 2.5 cm dome tweeter with a ceramic-coated aluminum diaphragm. Both drivers use sealed parallel magnet systems. The woofer is locked into an aluminum die-cast integrated frame, held from the front and rear of the baffle. Denon called this a "super bus mount structure," meant to keep the driver body and enclosure board from vibrating. The cabinet is softwood high-density particle board with a round baffle and rear duct. It borrows the D.A.S. structural enclosure tech from Denon's higher-end gear, including a tapered sound-absorbing body under the top plate to kill standing waves.
Rated specs: 45 Hz to 40 kHz frequency response, 6 Ω impedance, 130W maximum input (EIAJ), 91 dB/W/m sensitivity, and a 2,500 Hz crossover. It measures 208 × 336 × 218 mm and weighs 5.3 kg. The finish is a wood-grain laminate on all six sides.
Beyond the spec sheet, the record is thin. There is no documented history of the model's place in Denon's lineup, no independent reviews from the period, and no market data beyond the original price. Replacement foam surrounds (urethane edges) are still available for the SC-R11, which suggests enough of these remain in service to keep a small parts market alive. A related model, the SC-11, occasionally appears in Vietnamese classifieds. It is a different speaker and shouldn't be confused with this one.
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