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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





Technics RS-M245X cassette deck

 

They don't just reduce tape noise. They eliminate it. Technics cassette decks with Dolby B,C and dbx

This remarkable model M245X of Technics cassette decks represents an important technological advance in the fight against tape noise. Because unlike other decks that give you only one or the other, Technics now gives you; Dolby B noise reduction for compatibility with your present tape collection. Dolby C for compatibility with the new "C" encoded tapes. And dbx to eliminate virtually every decibel of audible tape noise. All in one deck.

-dbx is effective because it compresses a musical signal so its dynamic range is cut in half. When the tape is played back, the original dynamic range is restored, but the noise level is pushed below the level of audibility.

This allows loud passages to be recorded without distortion and soft ones without hiss.

These Technics cassette decks go on to give you computerized performance; microprocessor feather-touch controls. Music Select to automatically find any song on the tape. Music Repeat to replay a song up to 16 times. And a remaining time display to tell you how much recording is left on a tape.

In addition, there is automatic tape bias and EQ setting, expanded range (-40 dB to +18 dB) three-color FL meters to handle all the dynamic range dbx gives you, the accuracy and precision of two-motor drive and more.


 

Specifications

Type:  2-head, single compact cassette deck

Track System:  4-track, 2-channel stereo Rec/Pb

Tape Speed:  4.8 cm/s

Wow and Flutter:  0.045% (WRMS)

Frequency Response:

Metal Tape :  20 - 20,000 Hz  (50 - 18,000 Hz ±3 dB)

CrO₂  Tape :  20 - 19,000 Hz  (50 - 17,000 Hz ±3 dB)

Normal Tape :   20 - 18,000 Hz  (50 - 16,000 Hz ±3 dB)

Dynamic Range:  110 dB (at 1 kHz) with dbx in

Heads:

1 x  AX (Amorphous) record/playback,

1 x  Double Gap Ferrite erase

Motors: 1 x Reel, and  1 x Capstan

Tape Type: type I, CrO2, Metal

Noise Reduction: B, C, DBX

Max. Input Level:  10 dB or more improved with dbx in (at 1 kHz)

Signal to Noise Ratio (signal level = max input level A weighted, CrO₂ tape):

Dbx in :  92 dB 

Dolby C NR In :  75 dB (CCIR)

Dolby B NR In :  67 dB (CCIR)

NR Out :  57 dB

Fast Forward/Rewind Time:  approx. 90 sec with C-60 cassette tape

Inputs Sensitivity/Impedance:

Line :  60 mV/47 k Ω

Mic :  0,25 mV/400 Ω  - 10 k Ω

Output Level/Impedance

Line :  400 mV / 1,5 k Ω

Headphones :  125 mV / 8 o hm - 600 Ω 

Biaas Frequency:  80 kHz

Power Supply:  110,125,220,240 V AC 50/60 Hz

Power Consumption:  16 W - 22 W

Dimensions:  430 x 98 x 273 mm

Weight:  5.1 kg

Finish:  black or silver

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