Sony SS-RX3
Bookshelf speaker from Sony’s RX series with a three-way bass-reflex design, featuring POM whisker-reinforced drivers and a 2.5 cm soft dome tweeter.
Overview
The Sony SS-RX3 is a bookshelf-type speaker manufactured by Sony as part of the RX series. It uses a three-way, three-speaker bass-reflex system with a 20 cm cone-type woofer for low frequencies, a 7 cm cone-type midrange driver, and a 2.5 cm soft dome tweeter for high-frequency reproduction. The speaker was priced at ¥33,000 per unit around 1983.
Specifications
| Enclosure Type | Bass-reflex |
| Speaker Units | 200 mm cone type (woofer), 70 mm cone type (midrange), 25 mm soft dome type (tweeter) |
| Impedance | 6 Ω |
| Rated Maximum Input | 75 W |
| Instantaneous Maximum Input | 150 W |
| Output Sound Pressure Level | 91 dB/W/m |
| Playback Frequency Band | 38 Hz – 25,000 Hz |
| Crossover Frequencies | 1.2 kHz, 7 kHz |
| Dimensions (approx.) | 285 x 515 x 280 mm (W x H x D) |
| Weight (approx.) | 10.5 kg |
Design
The SS-RX3 features a three-way driver configuration with a woofer using a cone shape optimized via NASTRAN analysis and made from paper with POM (polyoxymethylene) whiskers, a material developed in collaboration with Japan’s Fiber and Polymer Materials Research Institute. The midrange diaphragm integrates POM whiskers and polyolefin resin for high rigidity and low mass, while the 2.5 cm soft dome tweeter uses an integrally molded flexible film diaphragm to reduce distortion. The magnetic circuit employs a large magnet and a slotted yoke to minimize distortion, and the driver is supported by a urethane edge and high-linearity damper.
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