Pioneer CS-616 (1977)
The Pioneer CS-616 is a 3-way, 3-speaker bookshelf system from 1977, originally priced at ¥49,800 per unit. Period reviews are scarce, but the engineering intent is well documented. Pioneer put a lot of design effort into the driver complement. This was not a budget offering.
The woofer is a 30 cm carbon fiber mixed cone with a shallow profile, coated with a damping agent to suppress resonance. It sits on a 156 φ mm ferrite magnet with a pure copper cap on the pole to reduce current distortion, and it uses a long voice coil for linearity at high input. The frame is die-cast aluminum, and so are the frames on the midrange and tweeter. The 10 cm midrange uses a lightweight, rigid cone paper with edge damping. The 4.5 cm tweeter has a straight-profile cone and a roll edge modified to extend high-frequency response.
The enclosure is substantial: a 24-mm-thick plywood baffle on a 20-mm-thick high-density particle board cabinet, with internal sound absorption and a uniquely folded bass reflex duct designed to prevent midrange radiation from the port. The crossover uses low-loss thick copper wire choke coils and metallized film capacitors. Rated frequency response is 30 Hz to 20,000 Hz, with crossover points at 1500 Hz and 4000 Hz, output sound pressure level of 93 dB/W/m, and a 100W maximum input. Impedance is 6.3 Ω. Dimensions are approximately 375 × 665 × 318 mm (W×H×D), and each speaker weighs a hefty 25 kg.
The CS-616 shares its woofer (Pioneer 30-738A) with the CS-516 and CS-F99 models. A Japanese auction listing for a pair closed at ¥19,999 with the note "work properly guarantee beautiful goods," which gives a rough sense of current market value, though that's a single data point. One vendor page claims Bluetooth support for this model. That is almost certainly wrong, since a 1977 passive speaker has no such capability.
Known Specifications
- Type: 3-way, 3-speaker, bass reflex, bookshelf
- Drivers: 30 cm woofer, 10 cm midrange, 4.5 cm tweeter (all cone type)
- Impedance: 6.3 Ω
- Playback frequency band: 30 Hz – 20,000 Hz
- Output sound pressure level: 93 dB/W/m
- Max input: 100W
- Crossover frequencies: 1500 Hz, 4000 Hz
- Original price: ¥49,800 (1 unit, 1977)
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