Specifications

RECORDING / BROADCAST
45
Other Applications:
®
Regulatory Certifications:
Specifications
The following applies to units in Stereo mode with 8-ohm loads and rated input sensitivity
unless otherwise specified.
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 fil-
ter.
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
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 connectors. 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 channel's input connectors
which, when turned on, bridges the two output channels for twice the
output voltage.
"Y" Input: An on/off switch located between the input connectors which,
when turned on, parallels the two input channels.
Indicators
TLC: An LED for each channel indicates the amplifier’s unique Thermal Level
Control (TLC) circuitry is starting to make subtle and dynamic gain
reductions 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 indicators are sensitive distor-
tion indicators that turn on long before distortion is audible. This cir-
cuit compares the actual waveforms of the input and output and
immediately alerts you of any distortion that exceeds .05% to provide
dynamic proof of distortion-free performance.
Signal: A green LED for each channel which flashes 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-sec-
ond delay while the amplifier performs a quick turn-on diagnostic, and
then illuminates the enable indicator to full brightness. If no signal is
present, the Enable indicator will switch to a dim level.
Input/Output
Input Connectors: One balanced 1/4-inch phone jack and one 3-pin female
XLR connector for each channel.
Input Stage: Input is electronically balanced and employs precision 1%
resistors.
Input Impedance: Nominally 20 k ohms balanced and 10 k ohms unbal-
anced.
Input Sensitivity: 1.4 volts for standard 1 kHz power, 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 accept
banana plugs.)
DC Output Offset: ± 10 millivolts.
Output Signal
Stereo: Unbalanced, two-channel.
Bridge-Mono: Balanced, single-channel. Channel 1 controls are active;
Channel 2 should be turned down.
Protection: Advanced protection circuitry guards against shorted out-
puts, open circuits, DC, mismatched loads, general overheating, high-
frequency overloads, and internal faults. Also includes TLC, out-of-
band filtering, inrush limiting and fuse.
Construction
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 (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.
Approximate 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
Using patented Balanced Current Amplifier (BCA) circuitry,
K Series amplifiers give you massive amounts of power while gen-
erating 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, let-
ting you realize significant savings over its life. And the sound?
Tight, chest-slamming low end, crystal-clear highs and a well-
defined midrange.