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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





Yamaha K-222 cassette deck

K-222 Features:
Double cassette deck
Full logic operation
High/normal speed one-touch-dubbing
Relay play
Dolby B/C NR
LED peak level meter
Music search
Rec return
Auto rec mute
Auto tape selector
Timer rec/play

The K-222 Natural Sound Double Cassette Deck joins the yamaha ranks with startling performance and increased versatility. It is truly two decks in one. Now you can enjoy extended playback, tape editing, and dubbing from one deck to another with virtually no loss of sound quality. A reliable dual-transport mechanism, Dolby noise reduction, Full Logic Operation and other advanced feastures  make the K-222 Double Cassette deck more exciting, more convenient, than ever. For double-cassette performance, the K-222 is an ideal choice.
Hard permalloy Rec/Play Head
At the heart of the K-222is a yamaha hardpermalloy rec/play head. Hard Permalloy, refined and improved by Yamaha audio engineers, possesses the magnetic characteristics, frequency response, and wear resistance suitable to today's tape. Formulations. The precision-machined and wound head ensures uncompromised performance and low distortion in both Record and Playback modes.
Full Logic Control
The K-222 Double cassette deck is an operational wonder, thanks in part to Full logic Control. A result of extensive electronics research, Full Logic Control is quick and precise; the perfect complement to a double-cassette format. A gentle touch of a button enters your command, and the K-22 responds instantly. Without the jostling and inconvenience of purey mechanical controls, the K-222 delivers the smooth performance expected of a Yamaha component.
Specifications:
Track Configuration:  4-track, 2 channel stereo
Motors:
2 x DC servo motor for Capstan
2 x DC motor for reel
Heads: 
2 x Phard Permalloy rec/playback
2 x Double gap ferrite erase
Wow And Flutter
No more than 0,08% (WRMS)
No more than ±0,15% ( W peak)
Fast Winding Time:  100 sec.
Signal-to-Noise Ratio:
Dolby off ;  better than 58 dB
Dolby  B on :  better than 66 dB
Dolby C on :  better than 74 dB
Frequency Response (-20 dB)
Normal tape :  30 - 15,000 Hz ±3 dB
CrO₂ Tape ;  30 - 15,000 Hz ±3 dB
Metal Tape ;  30 - 16,000 Hz ±3 dB
Total Harmonic Distortion: no more than 1%
Channel Separation:  better than 40 dB
Crosstalk:  better than 55 dB
Input Sensitivity/Impedance:
Line :  50 mV/50 k Ω
Output level:
Line :  360 mV/1,2 k Ω
Phones :  0,6 mV/8 k Ω
Dimensions (W x H x D):  435 x 112 x 273 mm (17-1/8" x 4-3/8" x 10-3/4")
Weight:  4,8 kg (10 lb 9 oz)
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