'STEREO -
-POWER AMPLIFIER
Since Citation XX is extremely heavy, carry out system General Instructions connection after carefully select~ngthe installation place
in the listening room. Firmly hold the carrying handles when carrying the unit. ,
Always use the unit at 110 V A C
This unit IS designed for use at 1 1 O V A c Connect the unit to a wall outlet with ample capacity because of the high power consumption of this unit. Do not connect this unit to an AC convenience outlet or an outlet supplying a higher voltage, and refrain from using a multiple outlet type connection because it is dangerous.
Do not open the cabinet
To prevent shock hazard or unexpected trouble, do not tamper with internal components for inspection or main. tenance. Harman Kardon does not guarantee performance result~ngfrom any modification.
When water or a metal piece enters the unit
When water, a hair pin or wire acc~d~ntallyenters the
unit, |
immediately extract tlie AC plug from the outlet |
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Do not operate the unit in vertical state
The rear side of th~sunit is provided with a protector so that it can temporarily stand on end. However. the p r o tector is only for protection of the terminals on the rear panel. Do not operate the unit while standing on end under any circumstances.
Handle the AC cord carefully
This unit consumes a large amount of power instantane-
.ously. The AC cord is.of vital importance In this sense. Always hold the plug when disconnecting the AC cord from the outlet. Pulling at the cord may m s e dis-
.continuity.
Do not place or drop heavy objects such as furniture on the C M ~ . DO not make a knot in the AC cord. Otherwise, the cord may be damaged, causing fire or shock hazard.
If the unit is not used for a prolonged period, disconnect the plug from the outlet.
Connections
Always d~sconnectthe 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. Connect the left channel and right channel output terminals of the preamplifier correctly 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, it 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 connectionsby checking preamplifier polarities.
Cannectcan cwds ta the preamplifier should nal entangle woth the AC card because it may degrade the sound quallw.
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Cannon connector handling method |
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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 as short as 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
lnfrasonic 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 1s 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. If 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.It 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. In 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. Th~sBessel 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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