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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 SEA-80 equalizer

A new 10-band equalizer from JVC Corp can "tune your room" for audio reproduction of the highest quality. The equalizer utilizes a pink noise generator that simulates the response of the human ear; energy distribution is constant as the signal doubles between 100 Hz and 200 Hz ; for example. The SEA-80 is claimed to actually analyze a room's acoustic so that you can make exact compensations on each of the ten channels. A Fluorescent Spectrum Analyzer Display divides input into ten bands (corresponding to the center frequencies of the equalization controls) and displays the dB level of each on ten, bright fluorescent bars. An eleventh bar charts over-all volume. This visual graph of a room's acoustics ensures real equalization, says JVC. Each display bar is designed to rise rapidly and fall slowly to enhance the visual representation of what your ears actually hear. The display covers the frequency range from 32 Hz to 16,000 Hz over the range from "0" to 26 dB. The SEA-80's mode switch allows a graphic reading of either the left- or right channel signals alone, as well as both together. A memory feature allows holding an input indication for closer inspection. The unit is said to aid in control of high frequency signals when recording on cassette tapes.
 Specifications
Circuitry:
Buffer Amplifier:  FET-equiped, ICL-input, double-differential, equiphase-feedback circuit
S.E.A. Amplifier:  Double-differential input, DC configuration circuit
Semiconductor L Circuit:  Transistor-inductor circuit
Input Section Impedance:
SEA Input :  47 k Ω
Tape Mon. :  47 k Ω
Output Section Impedance:
SEA Output :  100 Ω
Tape Rec :  100 Ω
Rated Output:  2 V RMS (with all S.E.A. controls pos. At "0")
Total Harmonic Distortion:  0,003% (at 1 kHz rated output)
Intermodulation Distortion:  0,003%  (with all S.E.A. controls pos. At "0")
Gain:  0 dB with SEA switch Off; 0 dB with SEA switch On; -6 dB with SEA switch at -6 dB
Frequency Response :  10 - 100 kHz (+0 -2 dB)
Signal-to-Noise Ratio:  118 dB (at rated output IHF A-network short-circuit)
Control Section
SEA Center Frequencies:  31,5 Hz; 63 Hz; 125 Hz; 250 Hz; 500 Hz; 1 kHz; 2 kHz; 4 kHz; 8 kHz; 16 kHz
SEA Control Range:  ±12 dB
Pink Noise Section
Output ;  50 mV RMS
Microphone Amplifier
Matching Mic. Sensitivity:  more than -72 dB
Matching Mic. Impedance:  less than 1 k Ω
Mic. Attenuator;  -20 dB
Graphic Display Section
Mic. Switch at Off:  Indicates the level of signals leaving the SEA Output terminals
Mic. Switch at on or -20 dB:  Indicates the level of input signals to the microphone
Display Modes;  L; R; L + R; Off
Memory:  Normal display is restored a few seconds after the Memory switch is released to Off
General Section
Power Source:  AC 110 V / 120V / 220 V / 240 V (selectable) 50/60 Hz
Power Consumption:  26 W
Dimensions (W x H x D):  450 x 158 x 319
Weight:  8 kg
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