SANSUI CD - α 607i
¥ 59,800 (around 1987)
Commentary
A CD player that pursues sound quality and performance beyond the class.
The mechanism is equipped with an original mechanism that adopts a low center of gravity and high rigidity floating system.
By lowering the center of gravity of the mechanism and at the same time floating from the chassis, external vibration is eliminated, and internal vibration is also reduced by increasing the rigidity of the main chassis and board.
The servo circuit uses a dynamic servo system, which reduces the load on the servo under normal conditions. When the disk is dirty or damaged, the system responds instantly, providing a stable trace capability with excellent response.
The digital filter employs a 4 x over-sampling digital filter that increases the sampling frequency from 44.1 kHz to 176.4 kHz, a 4 x increase, and reduces high-order harmonic noise in the music signal and sampling frequency.
This digital filter has excellent phase characteristics, cutoff characteristics, group delay characteristics, and extremely low ripple in the audio band. Therefore, the load on the analog filter is reduced, and sufficient filter effect can be obtained by using a low-order low-pass filter with simple and gentle attenuation characteristics. As a result, phase disturbance and distortion in the music signal band, which were generated by conventional high-order analog low-pass filters, are greatly reduced.
The D/A converter uses an independent twin D/A converter for both left and right.
The D/A converter is equipped with a high-precision ladder -type D/A converter capable of high-speed serial data processing to eliminate glitches (noise) during D/A conversion. By using this high-speed, high-precision D/A converter in a twin configuration with independent left and right channels, phase difference and crosstalk between channels are minimized, and sound quality is improved. In addition, a cross-fine circuit is adopted to suppress 0 cross distortion that occurs in minute signal regions.
The power supply section is composed of three independent power supplies to reduce the influence of the power supply of other circuits on the analog signal system.
The master clock system, which operates the digital signal processor, digital filter and D/A converter at the same clock, eliminates harmful beats caused by clock phase shifts and clock frequency differences when using multiple clock oscillators.
Solid & anti-flux chassis is adopted for the chassis structure, and mutual interference between the mechanism part and each part of the electric circuit is suppressed.
5-point support CF5 insulator with optimum load balance is adopted for the leg part to suppress external vibration.
Coaxial type digital output terminal is mounted.
It is equipped with functions such as random play, variable music scan and 4-mode repeat.
Equipped with auto-space function.
Wireless remote control is included.
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Model Rating
| Type | CD Player |
| Reading system | Noncontact optical |
| Pickup type | High-precision 3-beam semiconductor laser system |
| Number of revolutions | 200 ~ 500 rpm |
| Number of channels | 2 Channel |
| Sampling frequency | 44.1kHz |
| Number of quantization bits | 16-bit linear |
| Frequency characteristic | 4 Hz to 20 kHz |
| Harmonic distortion factor | 0.003% or Less (1 kHz) |
| Dynamic range | 97 dB or more |
| Wow and flutter | Measurement detection limit or less |
| Signal-to-noise ratio | 106 dB or more |
| Output voltage | 2V |
| Rated power consumption | 13W |
| External dimensions | Width 448x Height 98x Depth 317 mm |
| Weight | 5.4kg |
| Attachment | Wireless Remote Control |