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Connections
Always d~sconnect the AC cord from the mains outlet
before making connections with other components.
Connection with preamplifier
For connection between the input terminals (INPUT) of this unit and the output
terminals of a stereo preamplifier, always use high.quality connection cords. Con-
nect the left channel and right channel output terminals of the preamplifier cor-
rectly to the LEFT (left channel) and RIGHT (right channel) INPUT terminals of
this unit, respectively.
Insert plugs fully.
This unit is also provided with input
terminals for cannon connectors. Since a cannon connector is provided with a
hook to prevent accidental disconnection during operation, i t is safe. Capability of
sure, firm connection by one-touch operation is very convenient for those who
frequently change connections. When using cannon connectors, make correct
connections by checking preamplifier polarities.
Cannectcan cwds ta the preamplifier should nal entangle woth the AC card because it may
degrade the sound
quallw.
L I Z
Cannon connector handling method
..f
Push o h .
c
~
~
l
a
in.
r*( 8, 8 .
."10"\111011"
1osl.d
m
I h
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Speaker system connection
Connect speaker systems to speaker terminals of this unit. Carefully connect the
cords so as not to.mistake left and right channels and speaker polarities (+,
-).
Use sufficiently thick cords (14 gauge minimum) with thick insulation for full
attainment of the unit's performance.
Speaker cords should be a s short a s
possible.
To minimize the mntact resistance between the speaker terminals of this unit
and speaker cords, fully tighten the terminal knobs.
To prevent, shorting between the bare metal conductors of the positive and
negative cords, the tip ends of the conductors should be thoroughly wound in
the terminals.
The nomsnal speaker impdanceshould be between
4n
and
16n.
Connection diagram
l nf rasonic filter
Since this unit is a DC amplifier, any DC or subsonic component of the input signal
will be amplified.
Since a DC slgnal component adversely influences speakers, it
should be filtered out. When a DC component orstrong tubsonic signal 1 s present,
the red "infrasonic interference" indicator illuminates to warn the user. Press the
infrasonic filter switch. A 1 Hz filter is inserted into the circuit to cut off the
unwanted signal component. The green "infrasonic" indicator illuminates, and the
red warning display will soon turn off.
I f the
DC
component increases abnormally, a protection circuit stops the amplifier
operation, and the "safety" indicator ~lluminates. I f this state occurs, turn the
power off, check and eliminate the cause, and then turn the power on again.
Possible causes of the DC or subsonic signal components are warped records and DC
leakage from the preamplifier, tuner or tape deck.
Ultrasonic filter
This unit features the wide-band design in which the high-frequency zone extends
up to
3
MHz. Therefore, an AM radio station or a CB radio in the neighborhood
may become mixed with the input signal and ampl~fied. I t will adversely affect the
sound quality. Since the mixed radio frequency is outside the audible frequency
range, the user may not be aware of its presence. I n such a case, the red "ultrasonic
interference'' indicator illuminates to warn the user. Press the ultrasonic filter
switch. The green "ultrasonic" indicator illuminates and, at the same tlme, the red
indicator will turn off. A two-pole Bessel filter (100 kHz) i s inserted into the
circuit, and the mixed radio signal is removed from the music signal. T h ~ s Bessel
filter was chosen over other types because its effect on audible frequencies is less
likely to be noticed. When amplifier clipping occurs the high frequency distortion
may cause the "ultrasonic interference" indicator to illuminate for a short per~od.
This is not a fault, but an indication that the input signal should be reduced.
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