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





Kenwood KX-31 cassette deck

 

Kenwood KX-31, the single Stereo Cassette Deck, and features:

Dolby B noise reduction system

Tape selector (Normal, CrO₂, Metal)

7-LED peak level meters (-20 dB to +6 dB)

Full auto shut off mechanism in all modes

Timer stand by mechanism

Three digit tape counter

Two microphone jacks and headphone jack

 

Specifications

Type:  Stereo cassette deck with Dolby B NR system

Track System:  4-track, 2-channel stereo/mono, rec/pb

Erasing System:  AC System

Recording System:  AC bias system (bias frequency: 105 kHz)

Tape Speed:  4.76 cm/s (1-7/8 ips)

Heads:

1 x Hard permalloy with sendust guard record/playback,

1 x Double gap ferrite head, erase

Motor:  electronically controlled DC single motor

Fast Winding Time:  aprox. 95 sec. (C-60 tape)

Tape Type:  Normal, CrO2, Metal

Total Harmonic Distortion:  less than 1,0% (at 1 kHz , 0 VU Normal tape)

Frequency Response:

Normal Tape :  20 Hz to 16,000 Hz (30 Hz - 15,000 Hz ±3 dB)

CrO₂ Tape :  20 Hz to 17,000 Hz (30 Hz - 16,000 ±3 dB)

Metal Tape :  20 Hz to 17,000 Hz (30 Hz - 16,000 Hz ±3 dB)

Signal to Noise Ratio:

Normal Tape  (Dolby ON /OFF) :  67 dB / 57 dB

CrO₂ Tape (Dolby ON / OFF) :  67 dB / 57 dB

Metal Tape (Dolby ON /OFF) :  67 dB /57 dB

Wow and Flutter:  0.045% (WRMS)

Input Sensitivity/Impedance

Line  x 2 :  77,5 mv/50 k

Microphones x 2 :  0,7 mv/3,3 k

Output Level/Load Impedance

Line x 2 :  270 mv/50 k

Headphones x 1 :  50 mv/8

Power Requirements:  AC 120, 220 - 240 V switchable 50/60 hz

Power Consumption:  15 watts

Dimensions (W x H x D):  440 x 117 x 232 mm (17-5/16" x 4-39/64" x 9-1/8")

Weight:  4 kg (8,8 lbs)

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