K Series Service Manual Rev A.
2-2 Specifications
©1999 Crown International, Inc.
Out–of–band low–pass and high–pass filters protect
the amplifier and loads from infrasonic frequencies be-
low 8 Hz and ultrasonic frequencies above 30 kHz.
Turn On
State–of–the–art “soft start” feature prevents the am-
plifier from drawing a large inrush current when it is
first turned on. This feature also assures that no dan-
gerous artifacts are produced by the amplifier.
2.7 Construction
Chassis
Beautiful cast–aluminum front panel coated with a du-
rable powder coat finish. Front panel labels are printed
in color on Lexan for durability and fingerprinting resis-
tance. Aluminum chassis with durable black finish.
Cooling
High performance passive convection cooling system
allows the amplifier to drive 2-ohm loads to high music
sound levels (8 dB into clip) in a 40° C environment
without overthermalling.
Dimensions
Standard 19–inch (48.3-cm) rack mount width (EIA RS–
310–B), 3.5–inch (8.9-cm) height and 16–inch (40.6-
cm) depth behind front mounting surface.
Weight
K1
32 pounds (14.6 kg).
K2
38 pounds (17.3 kg).
Center of gravity approximately 6 inches (15.2-cm) be-
hind front mounting surface and left-right centered.
2.4 Input/Output
Input Connectors
One balanced ¼–inch phone jack and one 3–pin fe-
male XLR connector for each channel.
Input Stage
Input is electronically balanced and employs precision
1% resistors.
Input Impedance
Nominally 20 K ohms, balanced. Nominally 10 K ohms,
unbalanced.
Input Sensitivity
1.4 volts for standard 1 kHz power (33 dB of gain), or
26 dB gain.
Output Connectors
Two sets of color–coded binding posts for banana plugs,
spade lugs or bare wire. European models do not ac-
cept banana plugs.
DC Output Offset
±10 millivolts maximum.
2.5 Output Signal
Stereo
Unbalanced, two channel.
Bridge–Mono
Balanced, single–channel. Channel 1 controls are ac-
tive; channel 2 should be turned down. For polarity the
same as the input signal, use channel 1 output post as
the speaker positive and the channel 2 output post as
the speaker negative.
2.6 Protection
General Protection
K-Series
amplifiers are protected against shorted, open
or mismatched loads; overloaded power supplies; ex-
cessive temperature, chain destruction phenomena,
input overload damage and high–frequency blowups.
They also protect loudspeakers from input/output DC,
DC offset and turn–on/turn–off transients.
TLC protection circuitry protects the amplifier from ex-
cessive heat by subtly and dynamically reducing the
gain only when necessary to reduce heat levels. Trans-
former overheating (an extremely unlikely event) will
result in a temporary shutdown; when it has cooled to
a safe temperature, the transformer will automatically
reset itself.
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