Specifications

RECORDING & BROADCAST
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sing patented Balanced Current Amplifier (BCA) circuitry,
K Series amplifiers give you massive amounts of power while generat-
ing just one-tenth the heat of conventional amplifiers. In fact, the K2 can
deliver an amazing 1,250 watts per channel into 2 ohms! No cooling fan is
needed, making the amp maintenance-free. Highly efficient, the amplifier
draws only 12 watts at idle, letting you realize significant savings over its
life. And the sound? Tight, chest-slamming low end, crystal-clear highs
and a well-defined midrange.
`SPECIFICATIONS
Performance
Frequency Response: ± 0.25 dB from 20 Hz to 20
kHz. The frequency response is band limited with
an 8 Hz double integrated 3rd-order Butterworth
high-pass filter and a 32 kHz 7th-order Gaussian
low-pass filter.
Signal to Noise Ratio (Unweighted): >100 dB
below rated power.
Voltage Gain (at maximum level setting):
31.5 dB (K1) or 33.1 dB (K2) with input sensitivity
set to 1.4V.
26 dB with input sensitivity set to 26 dB.
Damping Factor: > 3,000 from 10 to 400 Hz
Input Stage: Input is electronically balanced and
employs precision 1% resistors.
Input Impedance: Nominally 20 k ohms balanced
and 10 k ohms unbalanced.
Input Sensitivity: 1.4 volts for standard 1 kHz
power, or 26 dB gain.
DC Output Offset: ± 10 millivolts.
Line Voltage Requirements: Universal power
supply can be configured to operate with 100, 120,
200, 220, 230, 240, 250 VAC at 50 or 60 Hz.
Adapters are available through an Authorized
Crown Service Center.
Front Panel Controls
Level: A calibrated rotary level control for each
channel.
Power: An on/off rocker switch.
Back Panel Controls
Input Sensitivity: A two-position switch for each
channel located near each channel’s input connec-
tors. Can be set to 1.4 V for full output into an 8
ohm load or a fixed voltage gain of 26 dB.
Bridge Output: An on/off switch near each chan-
nel’s input connectors which, when turned on,
bridges the two output channels for twice the out-
put voltage.
“Y”Input: An on/off switch located between the
input connectors which, when turned on, parallels
the two input channels.
Front Panel Indicators
TLC: An LED for each channel indicates the amplifi-
er’s unique Thermal Level Control (TLC) circuitry is
starting to make subtle and dynamic gain reduc-
tions to reduce heat rather than shut down. Unlike
competitive amps, which may thermal out, Crown’s
TLC insures your show goes on.
Clip: An orange LED for each channel which turns
on when distortion of any type becomes audible in
the amplifier output.
IOC
TM
: The yellow input/output comparator indica-
tors are sensitive distortion indicators that turn on
long before distortion is audible. This circuit com-
pares the actual waveforms of the input and output
and immediately alerts you of any distortion that
exceeds .05% to provide dynamic proof of distor-
tion-free performance.
Signal: A green LED for each channel which flash-
es dimly when a very low-level signal (as low as 10
mW) is present in the output. They flash brightly
when a louder signal (at least 1 watt) is present at
the output.
Enable: A green LED that illuminates when the
amplifier has been turned on and has power. When
first turned on, there will be a brief two-second
delay while the amplifier performs a quick turn-on
diagnostic, and then illuminates the enable indica-
tor to full brightness. If no signal is present, the
Enable indicator will switch to a dim level.
Input Connectors
One balanced 1/4-inch phone jack and one 3-pin
female XLR connector for each channel.
Output Connectors
Two sets of color-coded binding posts for banana
plugs, spade lugs or bare wire (European models
do not accept banana plugs.)
Protection
Advanced protection circuitry guards against short-
ed outputs, open circuits, DC, mismatched loads,
general overheating, high-frequency overloads, and
internal faults. Also includes TLC, out-of-band filter-
ing, inrush limiting and fuse.
Cooling
High performance passive convection cooling sys-
tem allows the amplifier to drive 2-ohm loads to
high music sound levels (8 dB into clip) in a 40° C
(104°F) environment.
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
Center of gravity is approximately 6 inches (15.2
cm) behind front mounting surface.
K1: 32 pounds (14.6 kg).
K2: 38 pounds (17.3 kg).
For shipping weight, add 6 pounds (2.7 kg) to each
amplifier’s weight.
Regulatory Certifications
Other Applications
All measurements apply to units in Stereo mode with 8-
ohm loads and rated input sensitivity unless otherwise
specified.