Sony CDP-S1 (1994)
The Sony CDP-S1 is a compact CD player released in 1994 at ¥32,000. It's part of Sony's S-Series component family. The case is slim, just 310mm wide and 90mm tall, and it was meant to sit alongside the ST-S1 tuner, TA-S2 amplifier, and TC-S1 cassette deck. The RM-S1 remote that came with the preamp controls all of them.
The headline technology is Sony's Advanced Pulse D/A converter, which pushed output density to 90 million pulses per second with a theoretical dynamic range of 131 dB. The digital filter uses 45-bit noise shaping. The servo circuit is a high-precision digital design - it employs a high sampling-rate A/D and D/A converter so that servocontrol better reflects the actual condition of the disc. Sony also included a delete shuffle function and an optical digital output.
Published specifications (EIAJ) are solid for the era. Frequency response is 2 Hz to 20 kHz ±0.5 dB, THD is 0.0027% or less, S/N is 107 dB or more, and dynamic range is 99 dB or more. Wow and flutter are below the measurement limit. Fixed output is 2Vrms, power consumption is a modest 9W, and the unit weighs about 3.5 kg.
Documentation beyond the specifications is thin. No period reviews have surfaced in the archive's sources, and no production history beyond the 1994 release year is recorded. One known repair topic is a failing display - a YouTube video documents a "Display Goes Out" issue. Replacement belts and wooden side panels (for the Scala series styling) circulate on the used market. Marketplace listings show refurbished units trading with warranty, and one complete S-Series stack with the RM-S1 remote listed recently. It's a 100V Japanese-market model, so North American buyers would need a step-down transformer.
Known specs:
- Price: ¥32,000 (1994)
- D/A converter: Advanced Pulse; digital filter: 45-bit noise shaping
- Frequency response: 2 Hz–20 kHz ±0.5 dB
- THD: 0.0027% or less (EIAJ); S/N: 107 dB or more; dynamic range: 99 dB or more
- Dimensions: 310 × 90 × 345 mm; weight: approx. 3.5 kg
- 100 VAC, 50/60 Hz; 9W power consumption
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