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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





Trio KX-920 (1977)


Trio cassette decks are manufactured to the highhest standards of quality, to ensure stable performance over a long working life.
The following important design considerations always apply:
Sensible positioning of control functions for ease of operation.
The use of large clearly defined VU meters to ensure the accurate setting of recording levels.
Purpose-designed tape transport controls for quick smooth operation Trio cassette decks offer facilities that are purely functional, and unnecessary styling features are always avoided.

Each model incorporates the Dolby Noise Reduction system and caters for ferric, ferric-chrome and chrome dioxide tape.
The tape transport systems used are high precision devices, which have undergone rigorous test procedures, including continous operation tests of 800 hours.
All in all, it's easy tosee why Trio cassette decks have quickly gained an enviable reputation for quality, reliability and professional performance.
KX-920 Dolby cassette decks
Having truly professional features and a performance to match, the KX-920 is designed to satisfy even the most discriminating tape enthusiast.
Features:
DC servo motor driving an extra large 90mm flywheel system.
New Super-Ferrite recording/playback head.
Full mixing facilitles for microphone and line inputs.
Separate tape bias and equalization switches catering for normal, ferrochrome and chrome-dioxide tapes.
Pitch control to provide 3% speed adjustment.
Quick reaction peak recording level indicator.
Cue and Review system for precise programme selection.
Three digit tape counter.
Connections:  two microphones, stereo line input/output, stereo DIN input.output, headphones.





Specifications
Tape system:  4-track, 2 channel stereo
Tape speed:  1⅞ i.p.s.
Usable tape: C-30, C-60, C-90 Compact Cassette
Heads:  Super ferrite
Motor: DC servo
Wow and Flutter:  0,08%
Frequency response:
Normal tape:  30 Hz - 14 kHz
Cr0₂ tape: 30 Hz -16 kHz
S/N ratio (Dolby IN):  62 dB (Cr0₂ tape)
Recording system: AC bias 85 kHz
Erasing system:  AC bias
Inputs Line:  77,5 mV/340 kΩ
DIN:  0,45 mV/1,3 kΩ
Microphone:  0,24 mV/10 kΩ
Output:  490 mV/100 kΩ
Fast forward/rewind time:  80 sec  (C-60 Compact Cassette)
Power consumption: 23 watts
power requirements:  240 V AC
Dimwnsions:  404 x 124 x 252 mm
Weight: 5,3 kg
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