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 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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