Marantz CD-84 159,800yen(1984 release)

　
The compact disk player which developed the original technology, and also supplied many know-hows and technologies and was developed in order to improve a tone quality, a stability, and an operationality.

Z filter which improves and developed the digital filter further is carried.
Z filter consists of a digital filter, a digital analog converter, and a low pass filter. With Z filter, oversampling of the sampling frequency is carried out 4 times, it is set to 176.4kHz and 44.1kHz is processed by the low pass filter with a loose property. The failure of the phase response which originates in a high order filter by this, or a transient response property is eliminated.
It extended the passband to 30kHz and has improved the transient response property at the same time the Bessel filter which is excellent in a phase response is used for the low pass filter of Z filter in addition to the lower degree of the 3rd order and it secures a phase response good to a high region.
Furthermore, right-and-left independent 2D / A converter is adopted as a D-A conversion, and it is suppressing that a phase rotation occurs.

The swing arm pickup is adopted as a pickup part.
The swing arm pickup maintains the dynamic balance by considering it as the structure which was equipped with the laser pickup at the leading end and to which it equipped the rear with the counter wait, and enables the always stabilized pickup trances.

The world's smallest semiconductor laser pickup is adopted as a pickup part.
Through a miniaturization, the component parts of the pickup are made simple and the component partses of optical system are decreasing in number even to the lens of two sheets, and one beam splitter. This becomes possible to maintain an assembly precision at a high level, and the robustness is improved.
Furthermore, the efficient design which uses only the center section of a laser beam effectively by miniaturization of the whole pickup is possible.

The base made from aluminum die-casting is equipped with the original swing arm pickup, an extraneous vibration and a fine oscillation of a rotation system are suppressed, and the stability is improved.

While carrying a large-sized transformer and a mass capacitor in a power-source part, an audio circuitry, a digital circuit, a servo circuitry, a digital display, etc. separate the power source of the circuitry which generates a switching noise, and are stopping the noise by adopting a perfect independent source.

The part which carried out the fountainhead through the hearing is adopted as each stage.
Furthermore, the grounding point which is an important factor of a tone-quality determine has also determined the best focus in the hearing.

The random access special NetWare program of a maximum of 24 music, a deletion special NetWare program, the auto music scan that reproduces only an intro, a head-search functionality, the skip function, the back skip function, the repeat function, and the music standby functionality are carried.

The large-sized display device which can perform a window of a digital display + special-NetWare-program indicator is carried.

The digital interface termination is carried.

It can be operated from the location left by the attached exclusive remote controller.
Moreover, the Marantz bus system which performs remote control easy operation with an exclusive microcomputer is supported, audio timer AT333R and remote control transmitter RMC-10 can be used together, and it can operate by remote control. 

Form	Compact disk player
<Disk>
Outer diameter	12cm
The number of channels	Two channels
Track pitch	1.6 micrometers
Scanning velocity	1.2-1.4m/sec
<Signal format>
Sampling frequency	44.1kHz
The number of quatizations	16-bit linear
Modulation technique	EFM
Channel bit rate	4.3218Mb/sec
Error correcting system	CIRC
Encode scheme	Two's complement
<Optical pickup>
Semiconductor laser wavelength	0.78 micrometer
Numerical aperture (NA)	0.45
Depth of focus	±2 micrometers
The diameter of the beam spot (disk top layer)	About 1mm in diameter
<Electrical properties>
An Output voltage/impedance	2.0V/60 ohm
Play frequency band	4Hz - 20kHz
SN ratio	96dB or more
Dynamic range	92dB or more
Channel separation	94dB or more
THD	0.003% or less (1kHz)
Wow and flutter	Quartz-crystal precision
Demphasis	Automatic switching
<Others>
Power source	AC100V, 50Hz/60Hz
Power consumption	28W
The maximum Dimensions	Width 416x height 90x depth of 300mm
Weight	8.0kg
Adjunct	Infrared remote control RMC-84

Posted in: Marantz, Marantz-Player, Marantz-Player-Digital, Marantz-Player-Digital-Compactdiskplayer