Tuesday, 18 December 2012

Marantz CD-25 44,800yen(around the 1986 time)

The compact disk player of the Philips Marantz which pierced through the tone-quality serious consideration design like the high-end model kind.

The 4 time oversampling Z filter is carried.
While securing the phase response which was excellent with the digital filter which carries out oversampling of the sampling frequency (44.1kHz) to 176.4kHz, 4 times, and "Z filter" constituted from the 3rd Bessel filter excellent in the phase response, a passband is extended to 30kHz,The transient response property is improved.

The digital analog converter has adopted 2DAC scheme which adopts a digital analog converter for exclusive use as right and left, and has realized phase rotation zero.

The single-beam pickup which was excellent in the simple structure at the ability to detect is driven by the perfect dynamic balance type arm.
It has succeeded in the miniaturization at the same time it renews the design of the laser pickup [ itself ] and adopts new optical system, in order to raise the performance further.
By Philips's original replica technology, a 10-micron aspheric surface skin film is coated on the surface of an objective lens, and optical system consists of two lenses. Thereby, the focal gap by spherical aberration is banished and it is considered as the highly precise and stabilized pickup.
Moreover, the focusing mechanism which was a former man-month (moving magnet) type is constituted from a method of MC (moving coil), and malfunction of a pickup which can be started by the bads of a disk is banished.

The whole compact-disk drive mechanism is carried with the perfect floating structure.
The oscillation and the vibration are suppressed because carry out independent equipment also of the tray lid currently united with the tray and it float[ a separation and ]-izes an included compact-disk drive mechanism for a tray from a chassis.

compact-disk drive mechanism "CDM-2" who adopted extensively as compact-disk drive mechanism the "high-density glass wool plastics" which is a material used for a medicine equipment etc. is developed and carried.
While investigating the thorough weight saving, the fall of resonance frequency is also realized.

The random access program function of a maximum of 20 music is carried.

The skip play functionality of a maximum of 99 music is carried, and the head of music to listen to can be pulled out easily.

The index play functionality is carried.

3 speed search which can perform three steps of speed transitions is adopted.

"2 Way display device" which switches and displays the numbering and lapsed time of music under performance is carried. 

Form Compact disk player
Digital analog converter L/R independent 2DAC
4 time oversampling digital filter
Filter The 3rd Bessel filter
Channel Two channels
Frequency characteristic 2Hz - 20000Hz, ±0.3dB
Dynamic range 96dB
S/N ratio 96dB
Channel separation 94dB(1kHz)
THD 0.003%(1kHz)
Wow and flutter Quartz-crystal precision
Error correcting system Cross interleave reed-solomon code (cross interleaved Reed-Solomon code)
Voice output 2Vrms
Laser AIGaAs semiconductor
Wavelength 800nm
Sampling frequency 44.1kHz
Quatization A 16-bit linear / channel
Power source AC100V, 50Hz/60Hz
Power consumption 20W
Dimensions Width 320x height 86x depth of 300mm
Weight 3kg


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