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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





JVC KD-55 cassette tape deck

Stereo Cassette Deck

This model is the best buy in JVC's line of high-performing hi-fi cassette decks. Its basic parameters are impressive: Frequency Response from 30 to 16,000 Hz with Chrome, wow/flutter of 0,15% (DIN 45 500) and Signal-to-Noise Ratio of better than 56 dB (ANRS off). If you're shopping for a medium-priced, high-performance deck, the KD-55 is a likely candidate for your stereo system.

Accurate Tape Transport

Like more expensive JVC cassette decks, the KD-55 employs a precision frequency generator (FG) servomotor to drive its capstan and reels in the advanced JVC drive configuration. The FG motor is renowned for its rotational accuracy independent of temperature changes, and simplified and advanced system has dramatically improved the stability and reliability of JVC cassette decks. Other KD-55 features to reduce wow and flutter include a large 80 mm -in-diameter dynamically balanced fly-wheel and a capstan shaft precision ground to a roundness of 0,1 µ.

Flattest Response from Any Tape

To solve the problem caused by improper bias and equalization, JVC has equipped the KD-55 with two 3-positioned tape switches - one for bias setting and the other for equalization. By properly adjusting these switches, you can get a natural and flat response from any type of tape, whether you prefer ferric, chrome or ferrochrome types. Another JVC feature included in the medium-priced KD-55 is a Recording Equalizer Switch which allows you to fine-adjust the high frequency response of your deck to compensate for variable tape sensitivities.

 

Easy One-Touch Recording Level Setting

You can set recording levels simply by pushing the Record button. On decks without this facility, you would have to push the Pause button and then the Record and Play buttons together

Features for Wider Dynamic Range

Super ANRS (Automatic Noise Reduction System) is a JVC exclusive that makes tape hiss virtually inaudible. And in addition to eliminating high-frequency noises during "silent" periods, the Super ANRS expands your deck's high-frequency dynamic range; high hats and tambourines, for example, won't sound cramped or distorted. Also, because the Super ANRS circuit is contained in an IC (Integrated Circuit), its long-term reliability is assured. Indeed, with the JVC combination of Super ANRS, a 5-LED Peak Indicator and large VU meters, you can produce undistorted, professional quality recordings instantly.

Unparalleled Ease of Operation

Three features dramatically enhance the ease of operation of the KD-55. one is the JVC-exclusive Gear/Oil-Damped Cassette Lid; it assures smooth, noise-less lid movement. The second is the unique Automatic Input Selector. With it selection priority is given first to Mic, then DIN and then Line inputs; you enjoy recording of a high Signal-to-Noise Ratio. Finally, the Output Volume Control lets you adjust the deck's output level with that of a tuner, etc.

 


Specifications

Type:  stereo cassette deck

Track System:  4-track, 2-channel

Frequency Response: 

SA/CrO₂ : 30 - 16,000 Hz (Typical)

Normal :  30 - 15,000 Hz (Typical)

Signal-to-Noise Ratio :  56 dB (from Peak Level, Weighted) without  Dolby

The Signal-to-Noise Ratio is improved by 5 dB at 1 kHz and by 10 dB above 5 kHz with Dolby on.

Wow and Flutter:  0,05% (WRMS); 0,14% (DIN 45 500)

Crosstalk:  65 dB at 1 kHz

Channel Separation:  35 dB at 1 kHz

Total Harmonic Distortion :  1,3% ( 1khz, 0 VU, Normal tape)

Heads: 

Recording/Playback :  SA (Sen-Alloy) head

Erase: Two-gap , Ferrite head

Bias:  AC bias (95 kHz)

Erasure:  AC erasure (95 kHz)

Motors:  Frequency-Controlled DC Servo motor

Tape Speed:  4,8 cm/sec

Fast Forward/Rewind Time:  80 sec with C-60 cassette

Bias and Erase System:  AC-95 kHz

Input Sensitivity/Impedance:

MIC :  0,2 mV/600 Ω  - 10 k Ω

Line :  80 mV/100 k Ω

DIN :  0,1 mV/ 10 k ohm

Output Level/Impedance

Line :  0-500 mV/3 k Ω

Headphone :  0-500 mV/3 k Ω 

DIN:  0,5 mW/8  Ω  - 1 k Ω

Power Requirements:  AC 240/220/120 V 50/60 Hz

Power Consumption:  11 W

Dimensions (W x H x D):  420 x 149 x 264 mm (16-9/16" x 5-7/8" x 10-7/16")

Weight:  5,6 kg (12,3 lbs)


 

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