Audio Database

CD - α 717D Extra
Commentary

This is a CD player that uses the Mash system New L. D. C. S.

The D/A conversion section is equipped with New L. D.C. S of 1-bit D/A conversion method based on crystal oscillation.
The digital signal is converted into a PWM signal in the Mash section, and the analog signal is output directly through a low-pass filter. Therefore, the generation of 0 cross distortion and nonlinear distortion is eliminated in principle.
In addition, the PWM output of the D/A converter is configured as a 4 dac twin balance system to obtain an excellent SN ratio by eliminating in-phase noise and increasing the output signal, and to reduce second harmonic distortion.
Moreover, in order to take advantage of the characteristics of the Mash, original technology was put into the peripheral circuit, and the reproducibility of the signal at a finer level and the SN of the whole system were improved.

The mechanism section employs a 4-motor mechanism consisting of a tray loading and mechanical chassis up of two independent motors for smooth operation, a linear motor for both high-speed access and quietness, and a spindle motor. The triple chassis structure enhances vibration isolation.

The disk tray uses liquid crystal polymer to ensure stable performance as a rotating body.
This material has excellent vibration absorption characteristics as well as high rigidity and elasticity. Moreover, since the expansion coefficient is low, the tray with excellent dimensional accuracy is realized.

In the power supply section, two transformers are installed in order to fully separate the digital and analog systems from the transformer stage in consideration of mutual interference.
In addition, it is composed of 9 independent power sources to eliminate mutual interference, and high-speed power sources are mounted on analog part and L. D.C. S. Together with independent power sources, it constitutes a powerful power source part.

The servo circuit uses a unique dynamic balance servo system to prevent servo current from flowing into the audio section and adverse effects from the servo circuit.
In addition, it is equipped with the NEW dynamic servo system that cancels the crossover distortion of the servo drive amplifier to eliminate noise completely.

The digital output is equipped with an optical system with an On/Off switch and two coaxial systems.
It is also equipped with a balanced output that prevents noise from entering through the ground and can be connected to an amplifier with a balanced input terminal.

Equipped with COMPUEDIT capable of efficient tape dubbing.

It is equipped with functions such as variable scan and tracking memory function, random play and 2-position repeat which are convenient for program setting.

A remote control is included.

Model Rating
Type Α -X Balanced CD Player
Reading system Non-contact optical system
Pickup type High-precision 3-beam semiconductor laser system
Number of revolutions 200 rpm ~ 500 rpm
Number of channels 2 Channel
D/A converter 1-bit linear & direct conversion system (4 dac)
Frequency characteristic DC ~ 20 khz ± 0.3 db
Harmonic distortion factor (1 kHz) Not more than 0.0025%
Dynamic range 98 dB or More (EIAJ)
Wow and flutter Measurement limit value or less
Signal-to-noise ratio 105 dB or more (EIAJ)
Output voltage 2V
Rated power consumption 27W
External dimensions Width 466x Height 127.5x Depth 397.5 mm
Weight 11.0kg
Attachment Wireless Remote Control RS 1110