Onkyo SC-900 (1980–1982)
A 3-way bass reflex loudspeaker system built in Japan during the early 1980s.
Overview
The Onkyo SC-900 is a floor-standing loudspeaker system made by Onkyo in Japan. It was produced from 1980 to 1982. It is a 3-way bass reflex design with an Onkyo Radial Ribbon Tweeter. The cabinet has a walnut finish, and the frequency response is rated from 25 Hz to 70,000 Hz. Nominal power handling is 100 watts, with a music load capacity of up to 150 watts. Onkyo positioned it as a high-performance speaker for audiophiles of its era.
Specifications
| Nennbelastbarkeit | 100 Watt |
| Musikbelastbarkeit | 150 Watt |
| Driver technology | ONKYO-Radialbändchen-Hochtöner (Onkyo Radial Ribbon Tweeter) |
| Type | 3-way, bass reflex |
| Frequency Response | 25 - 70'000 Hz |
| Impedance | 6 Ohm |
| Sensitivity | 90 dB |
| Dimensions | 396 x 680 x 341 mm |
| Weight | 25.5 kg |
| Made in | Japan |
| Color | Walnut |
Design
The SC-900 uses a 3-way bass reflex enclosure. A dedicated Onkyo Radial Ribbon Tweeter handles the high frequencies. The cabinet gets its extended bass response from a reflex port,
Product Family
The SC-900 was part of a broader Onkyo lineup that included the M-35, M-55 II, SC-200, SC-400, and SC-600 models. That suggests a tiered product strategy during the early 1980s.
Market
Original pricing was approximately 950 DM. Today, units in working condition have been listed around 1,450 €, though availability is limited. Speaker surrounds are known to degrade over time. Re-foam repair kits are available for restoration.
Similar items on eBay
No exact Onkyo SC 900 listings are live right now — these searches show current Onkyo and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.