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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Marantz CD-73

 Marantz introducing the revolutionary Compact Disc Player

 

Digital Audio, the greatest improvement in music reproduction since the birth of stereo is now available to give you sound more pure than any you have previously heard. 

 

The Marantz CD Experience

It's dramatic. And instant. Plug the Marantz Compact Disc Player directly into your existing system and it immediately upgrades the sound-limited only by the performance of your current equipment. You can expect astonishing channel separation. Very precise spatial imaging. Sensational dynamic range. Rich bass notes. Pure true treble. And, because the encoded music is read by non-contact laser-absolutely no background noise and no disc wear. 

 

Marantz Features.
The Marantz CD73 is gold toned. Elegant. Simple. The control panel is clean and neat, with LED signals to indicate function and track selection. The highly sophisticated technology is push-button operated. The disc drawer glides with the smooth precision of electronic control. 

Marantz is control convenience.

And technologically, Marantz uses a special integrated circuit with three functions (oversampling, a transversal filter and noise-shaping) which processes the original signal tnrough various stages to give a dynamic range of 97dB. This amounts to a 1 dB improvement over most other systems. You may never hear the difference. But Marantz cared enough to make their Compact Disc Player demonstrably closer to perfection. 

 

Is the Marantz CD-73, really any different?

David Prakel for Hi Fi Answers magazine (UK) who did hear the difference said: "I have been surprised by the quite audible difference between different CD players and have already stated a preference for the sound of the Marantz machine in terms of its handling of 'ambience' and its sheer unfatiguing listenability. Other players I've heard in direct comparison have shown a bright veiling effect with more up-front presentation and a fatiguing quality." Marantz CD-73 is a front-loading player in which the disc I spins in the horizontal plane. So the height has been kept to a slim 80mm, though width (415mm) and depth (300mm) are `full size'. The disc drawer is mechanically complicated: pressing the open/ close button causes the drawer to slide out while the front tilts forward and the disc-clamp panel pops up simultaneously. Green illumination allows the disc to be seen during play through windows in the top and front. An extended display panel carries numbered green lights from 1 to 15 showing the total number of tracks on the disc, with amber lights underneath indicating the track being played.

Apart from simple playing of a disc straight through from the beginning, there are self explanatory rewind, fast forward, 'next program', repeat and pause controls. Programming tracks (up to 15) in any desired sequence is achieved by pressing a 'select' button the required number of times (or holding it down until the required track number is indicated on the display) for each track and entering this in the memory by pressing a 'preset' button. This takes a little time to arrange for a complicated sequence, but works impeccably-and the whole sequence can be set to repeat itself indefinitely. Individual tracks in a sequence can be cancelled, or repeated, with the visual display at all times showing the particular tracks in the stored programme.

Grouping of the controls along the lower edge of the front panel is logical, but some practice will be needed to master the flexible facilities offered. The state of play is always clearly displayed, except for the omission of any 'real time' indicator. No sound is heard during fast forward or rewind, so that trial and error has to be used for locating a cue within a track-the fast wind operating for as long as the button is held down, and play being resumed when the button is released.
The Marantz CD-73 therefore comes in the middle category as far as features and displays are concerned. It scores high marks for smooth operation and smart appearance-having the attractive finish of all the current Marantz 'separates', such as the PM350 amplifier and ST450 tuner which we reviewed in October 1982 (page 504). Rear panel connections include the usual pair of phono sockets for audio output, plus sockets for an optional infra-red remote control kit. Mains connection is via a two-pin socket: mains cable and phono leads are supplied.

Specifications
Sampling Frequency:  44,1 kHz
Number of Quatizations:  16-bit linear
Modulation Technique:  EFM
Channel Bit Rate:  4,3218 Mb/sec
Error Correcting System:  CIRC
Encode Scheme:  Two's complement
Semiconductor Laser Wavelength:  0,78 micrometer
Numerical Aperture (NA):  0,45
Depth of Focus:  ±2 micrometers
Diameter of the Beam Spot (disk top layer):  About 1 mm in diameter
Output:  2,0 V
Play Frequency Band:  5 Hz - 20,000 Hz
Signal-to-Noise Ratio:  90 dB or more
Dynamic Range:  90 dB or more
Channel Separation:  90 dB or more
Total Harmonic Distortion (1kHz):  0.004%
Wow and Flutter:  Quartz-crystal precision (below a limit of measurement)
De-emphasis:  Automatic switching
Power Source:  AC 100, 120, 220, 240 V, 50/60 Hz
Power Consumption:  30 W
Dimensions (W x H x D):  416 x 81 x 300 mm
Weight:  8 kg