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





Technics RS-M231X cassette deck

Technics presents a stereo cassette deck with a rare combination; 3 major noise reduction systems, and a low price. In addition to the RS-M231X's Dolby B and C noise reduction circuitry is dbx, which doesn't just reduce background tape noise but eliminates it. We've also furnished the RS-M231X with soft-touch transport keys, a metal compatible MX head, and convenient  slider controls for input level and balance adjustment.

dbx, Dolby B and Dolby C
The most effective of the deck's noise reduction systems is dbx, which eliminates tape noise and gives your tape the ability to reproduce up to a 110 dB difference in volume levels (or dynamic range) of a live performance, dbx reduces noise by at least 30 dB, pushing tape hiss below audibility, and increases headroom by about 10 dB so the tape can accept loud music signals without distorting them. The result is concert-like realism.
The RS-M231X is also equipped with a dbx disc decoder, so you can experience the same live-performance excitement from the ever-increasing number of dbx-encoded LPs as you do from dbx-encoded tapes.
Dolby B, the noise reduction system used in many cassette decks and prerecorded tapes, and Dolby C, an improved version of Dolby B, both reduce tape noise, especially in the high frequency range, where tape hiss is most noticeable.

Soft-Touch Controls
The soft-touch controls, which require only a light touch to operate, boast an impressive array of convenience features. Mechanical logic allows you to switch from fast forward or rewind directly to play, without having to touch the "stop" key. For recording, just touch the "record" key instead of "record" and "play". And rewind auto-play begins playback automatically after the tape rewinds to the beginning. The deck also includes cue and review functions, and timer record/playback capability.

Input Level and Balance Slider Controls
The deck's dual slider system provides optimum precision in setting recording levels. For most recording, the master input level slider suffices adjusting both the left and right channels together. For such demanding situations as live recording, where microphones are used, the balance slider adjusts left/right channel balance.

Metal Compatible MX Head
Specially developed for metal tape compatibility, Technics' MX head handles metal tape's high signal and bias level requirements and provides smooth frequency response and wide dynamic range. Of course, this improves the performance of normal and CrO₂ tapes as well.

Other Features:
DC servo motor
Automatic mic/line input selector
Large illuminated level meters
Timer record/playback capability
Oil-damped cassette well door removable for easy maintenance.
Specifications
Track System:  4-track,2-channel stereo recording and playback
Tape Speed:  4,8 cm/s (1-7/8 ips)
Wow and Flutter:  0,048% WRMS
Frequency Response
Metal Tape :  20 - 19,000 Hz; 50 - 17,000 Hz (±3 dB)
CrO₂ Tape :  20 - 18,000 Hz ; 50 - 16,000 Hz (±3 dB)
Normal Tape :  20 - 17,000 Hz ; 50 - 15,000 Hz (±3 dB)
Dynamic Range:  110 dB (at 1 kHz, CrO₂) with dbx in
Max. Input Level Improvement:  10 dB or more with dbx in (at 1 kHz)
Signal-to-Noise Ratio
dbx In :  92 dB
Dolby C NR In  :  75 dB (CCIR)
Dolby B NR In  :  67 dB (CCIR)
NR Out  :  57 dB
Fast Forward and Rewind Time:  approx. 90 sec. C-60 tape
Input Sensitivity/Impedance:
Mic :  0,25 mV, applicable mic. Impedance 400  - 10 k
Line :  60 mV/more than 47 k
Output Level?Impedance:
Line :  400 mv/1,5 k  or less
Headphones :  80 mv (at 8 ), applicable headphone impedance 8  - 600
Bias Frequency:  80 kHz
Motor:  DC servo motor
Heads:  2-head system
MX head for record/playback
Double Gap Ferrite Head for erasure
Power Requirements:  AC 120 V, 50/60 Hz
Power Consumption:  16 W
Dimensions (W x H x D):  430 x 109 x 235 mm (16-7/8" x 4-5/16" x 9-1/4")
Weight:  4,4 kg (9 lbs 11 oz)

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