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-66 equalizer



SEA-66 Stereo Graphic Equalizer
Features:
10 LED-lit frequency equalizer controls per channel
10-band real-time spectrum analyzer for frequency analysis
Buil-in pink noise generator for room acoustics compensation
3 deck connections with dubbing from 1 to 2/3 , 3 to 1, and 3 to 1
Selectable ±12 dB/  ±6 dB control range
S.E.A. defeat switch

If your living room doesn't have the fine acoustics of music hall, don't despair, the capable SEA-66 is at your command . It is equipped with a spectrum analyzer, a pink noise generator and a mic input, making it a simple procedure to compensate for the individual acoustics of your room. For this purpose, JVC recommends the precisely calibrated MU-S80 microphone.
 a total of 10 equalizer controls per channel are spaced at one octave intervals, giving you tremendous equalizing versatility. Individual controls are tipped with LEDs to graphically display the selected response. The SEA-66 can connect and monitor up to three tape decks and offers complete dubbing capabilities.

Specifications:
Input Impedance
S.E.A. Input :  47 k
Tape Monitor Input :  47 k
Output Impedance
S.E.A. Output :  680
Tape Rec Output :  680
Rated Output (Freq. EQ Controls at Flat):  2 V RMS
Maximum Output(Freq. EQ Controls at Flat):  6 V RMS
Total Harmonic Distortion:  0,005% (20 Hz - 20 kHz rated output)
Intermodulation Distortion (Freq. EQ Controls at Flat):  0,005%
Gain:  0 dB
Frequency Response:  10 Hz - 100 kHz +0 -2 dB
Signal-to-Noise Ratio :  115 dB
Center Frequencies:  31,5; 63; 125; 250; 50; 1 k; 2 k; 4 k; 8 k; 16 kHz
Control Range:  ±12 dB/±6 dB
Pink Noise Oscilator Output:  35 mv RMS
Optimum Microphone Sensitivity:  over 72 dB
Optimum Microphone Output/Impedance:  less than  1 k
Dimensions (W x H x D):  435 x 77 x 275 mm
Weight:  3,5 kg

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