Nakamichi CDPlayer4
¥ 49,800 (around 1990)
Commentary
A basic single-disc CD player.
The digital filter uses an 8 x oversampling digital filter.
The analog filter is a third order linear phase Bessel type analog filter.
The D/A converter uses a linear 18-bit glitch free D/A converter.
Multi-regulated power supply system is adopted for the power supply section, and power is supplied independently for each circuit section.
In addition, the isolated ground method is adopted to prevent noise contamination between the digital circuit and analog circuit surrounding the ground line.
A floating mechanism has been adopted for the mechanism part to reduce the influence of external vibration.
8 cm CD is supported.
Built-in program memory and repeat play function.
Equipped with a digital output terminal.
Equipped with headphone port with level control.
Wireless remote control is included.
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Model Rating
| Type | CD Player |
| Reading system | Non-contact optical (semiconductor laser used) |
| Error correction method | CIRC method |
| Number of channels | 2-channel stereo |
| D/A conversion method | 18-bit dual D/A converter |
| Digital filter | 8 x oversampling digital filter |
| Sampling frequency | 44.1kHz |
| Quantization | 16-bit straight line |
| Disk rotational speed | Approx. 200 ~ 500 rpm (Constant Linear Velocity) |
| Wow and flutter | Below the measurement limit |
| Frequency characteristic | 5 Hz to 20 kHz ± 0.5 dB |
| Signal-to-noise ratio | 105 dB or more (IHF A-WTD) |
| Dynamic range | 97 dB or more |
| Total harmonic distortion factor | 0.0035%(1kHz) |
| Total harmonic distortion factor + noise | 0.004%(1kHz) |
| Channel separation | 95 dB or more |
| Output (1 kHz, 0 dB) | Line : 2.0V/600 Ω Headset : 60 mW (40 ohm load) |
| Accessory function | Memory Play Repeat play System remote terminal |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 15W max. |
| External dimensions | Width 430x Height 100x Depth 320 mm |
| Weight | Approx. 5.0 kg |
| Attachment : Remote Control Unit CDPlayer4 Remote Control | |
| Method | Infrared pulse type |
| Pwer | DC3V(1.5Vx2) |
| External dimensions | 63 mm wide x 18 mm high x 135 mm deep |
| Weight | Approximately 100g (including dry batteries) |