Harman Kardon RCITXX User manual

'STEREO -
- POWER
AMPLIFIER
Since Citation XX is extremely heavy, carry out system
General I nstructions
connection after carefully select~ngthe installationplace
in the listening room. Firmly hold the carrying handles
when carrying the unit.
,
Always use the unit at 11 0 V A C
This unit IS designed for use at 11 OV A c Connect the
unit to a wall outlet with amplecapacity becauseof 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 componentsfor inspection or main.
tenance. Harman Kardon does not guarantee perform-
ance result~ngfrom any modification.
When water or a metal pieceentersthe unit
When water, a hair pin or wire acc~d~ntallyenters the
unit, immediately extract tlie AC plug from the outlet
anrl rnn<n~lt with fhp n<-arr.%l Hwrnnn Karrlrm r*.*wr..
Donot operate the unit invertical state
The rear side of th~sunit is provided with aprotector so
that it can temporarily stand on end. However. the pro
tector is only for protectionof 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 importanceInthis sense.
. Always hold the plug when disconnectingthe AC cord
from the outlet. Pulling at the cord may msedis-
continuity.
. Do not place or drop heavy objects such as furniture
on the
CM~. 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, discon-
nect the plug from the outlet.

Connections
Always d~sconnectthe AC cord from the mains outlet
before makingconnections with other components.
Connectionwith 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 accidentaldisconnection 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 checkingpreamplifier polarities.
Cannectcan cwds ta the preamplifiershould nal entangle woth the AC card because itmay
degrade the sound quallw.
LIZ Cannonconnector handlingmethod
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Push oh. c~~la in.
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Speaker system connection
Connect speaker systems to speaker terminals of this unit. Carefully connect the
cordsso as not
to.mistake leftand right channelsand 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
l nfrasonic 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.
If the
DC component increases abnormally, aprotection 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 componentsare warped records and DC
leakagefromthe 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.Itwill 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. Insuch acase, 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)
is 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 notafault, but an indication that the input signal should be reduced.

Bias selection switches
This unitenables bias selection in 3 stages (low, normal and high). The bias settings
allow the effective use of the heat stnk thermal capatity by adjusting the idle
current to the operating conditions. Generally select the normal bias position.
, low position
The low bias position reduces the bias but is the optimunl setting for continuous
use at high,power levels. The low bias position is also optimal for use at a high
roomtemperatureand/or a poor heat radiation environment.
normal position
The normal bias position is recommended for normal use irrespectiveof the music
genre, big band orchestra, popular or jazz. The heat generatedis alittle more than
that inthe low bias position.
high position
The high bias position is suitable when delicate reproduction is required such as
when listening to baroque music. The heat generation is the highest and the heat
sink temperature rises up to about 50°C. Use at this position should be avoided
when the room temperature is high or heat radiationenvironment is poor. When it
is desired to expedite warmtng up after power on, the amplifier is warmed in a
short time by selectingthis position.
DO not Operate continuously at high volume levelsat rhe high bmr poritmn for a long Inme.
A high temperature pror~ctotmay be activated when the charrlr temperature reacher
about
65'C.
Thermal protector
When the heat sink tempereture exceeds 65OC. a thermal protector is operated to
pr~te~t'thepower transistors. The red "safety" indicator illuminates and the ope.
ration stops. Ifthis occurs, turn the power offtemporarily. After cooling the unit
awhile, place the bias selection switch in the low or normal bias position, turn on
the power and continue touse the unit.
IUW normal htgh
IBlAS
1
Operating procedure
Beforeturning the power on, be sure to check that all connections are correct.
1. Turn the volume control knobof
your preamplifier to the minimum level.
2. Select the desiredsource.
3. Turn on the preamplifier power.
4. Press the nornlal bias switch. Press the high bias switch when it is desired to
expedite warming up of the amplifier.
5. Turn on the power switch. The red "wait" indicator illumtnates. In about 7
seconds, the "wait" indicator goes off,the green "on" and "Citation
XX" indi-
cators illuminate and the amplifier is ready for operation.
6. Start the source (tapedeck, turntable, etc.).
(iradually increase the preamplifier volunle and sound will be heard from the
speakers.
7. If the "lnfrasonic interference" or "ultrasonic interference" indicators tllumi-
nate during operation, press the corresponding filter switch. (See Inltasonic
and Ultrasonic filter explanations.)
8. When turning off the system power at the end of operation, first turn off the
power of this unit and then turn off the power of other system compone]its.
Turning off the preamplifier power first may cause generation of a turn-off
transient which will be amplified by this unit and may damage the speakers.
Protection circuit -
a The "wait" indicator illuminates for about 7 secondsafter the power is turned on,
and no sound will be heard fromthe speakersduring this period. The protecriort
circuit mutes the unit until it stabilizes. This prevents noise and turn-ontran-
sients from damagingthe speaker systems.
a The protection circuit also mutes the speaker output when the speaker terminals
are shorted during operation. Although the protection circutt resets automati-
cally, turn offthe power temporarily and remove the short circuit.
a In case of abnormal heat generation, refer to the explanation of blas selectton
switches.
The design and specifications are subject to change for improvement wtthout
notice.
Specifications
Output
Input sensitivity
Filter
Infrasonic
Ultrasonic
Power source
Power consumption
Dimensions
Weiqht
8Rload 250W x 2
4S2 load 440W x 2
IVIlSkR
1Hz (6dB/octl
lOOkHz (Secondarybessel filter)
ACllOV6OHZ
1050W
425mm(W) x 195mm(H)x 487mm(Dl
42kg

Locationsfor installation Fuse replacement
Avoid the following locations for safe operation of this To maximize the high current performance of this unit.
unit: it uses a special fuse that will not melt in normal ope
Place exposed to direct sunlight, near a heat source. or ration. If the fuse is blown. consult with your dealer or
acold place such as near acoolingair outlet. Harman Kardon service shop. Do not try to replace the
Humid or dusty place, or a place exposed to direct fuse yourself.
vibration such as on aspeaker.
Since this unit weights 42kg. avoid an unstablebase or
a rack with insufficient strength. A sturdy base will
ensure better sound quality.
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Pay spec~al attention to heaGidiatr63
This unit generates much heat because of high current
conductionto obtain better sound quality. Donotplace
the unit on another component or inanarrow rack that
will obstruct the vertical flow of air required for ade.
.quate heat radiation.
, , Select an installation placeensuringsufficientventilation.
Rack mounting according to the EIA specification is
~05sihIr.hiat lv $I#-- lo al<t>pay st~ffici~~lt at:rwl!,~n 10
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Block diagram
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