Sony ss-7330a
A 3-way bass reflex bookshelf speaker system with carbon fiber drivers and a multi-amplifier selector switch.
Overview
The Sony SS-7330A is a 3-way, 3-speaker bookshelf system built for high-fidelity reproduction. It has a bass reflex cabinet, a 30 cm carbon fiber woofer, a 12 cm carbon fiber midrange and a 2.5 cm soft dome tweeter. Sony engineered it for low distortion and wide frequency response. The mid and high ranges have user-adjustable level controls. There is also a multi-amplifier selector that bypasses the internal crossover network and connects the drivers directly.
Specifications
| Original price | ¥ 50,000 (1 unit, around 1974) |
| Woofer | 30 cm cone type |
| Midrange | 12 cm cone type |
| Tweeter | 2.5 cm dome type |
| Effective frequency band | 40 Hz to 20 kHz |
| Output sound pressure level | 88dB/W/m |
| Impedance | 6 Ω |
| Maximum allowable input | 100W (Weighted pink noise) |
| Crossover frequency | 600 Hz, 3.5 kHz |
| External dimensions | Width 390 x Height 636 x Depth 310 mm |
| Weight | 22kg |
Design
The cabinet is a 3-way bass reflex design made from 20 mm thick hard particleboard with a wood finish. The magnetic circuit is Sony's low-distortion type, with a notch in the center pole and a thick copper plating or cap to reduce non-linear distortion. The drivers have dust-proof caps for better sound insulation. The diaphragms are made from selected Northern European pulp to minimize sound turbidity. The crossover uses large air-core coils with low DC resistance to prevent distortion under high input. The mid and high level controls are continuously variable, and the multi-amplifier selector switch removes the LC network for direct driver amplification.
Market
Users report that the SS-7330A sounds neutral, with a wide soundstage and strong bass extension. They say it suits both music and home theater, and that most amplifiers drive it easily. The foam surrounds on the woofers are prone to deterioration and often need replacing, and original replacement drivers are hard to find.
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