Crown Audio CTs 2-Channel - Manual (Page 21)

COMMERCIAL AUDIO
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www.crownaudio.com
T he Crown ® 180A, 280A and 1160A are high-value amplifiers for commercial and industrial audio.
They provide 4-ohm and constant-voltage outputs (70V and 100V). The amps are part of Crown’s
Commercial Audio Series, which also includes mixers and mixer-amps. These low-cost units provide
all necessary features in a simple building-block format.
SPECIFICATIONS
Performance
Frequency Reponse (at 1 watt from 4-ohm
tap): 70 Hz to 19 kHz +/- 1 dB.
Frequency Response (at line out): 20 Hz to 20
kHz +/- 1 dB.
Power Bandwidth (at 4-ohm tap, 2 dB below
maxium 1 kHz power): 50 Hz to 20 kHz with
< 0.5% THD
Signal to Noise Ratio (ref. to rated power,
master volume at minimum): 85 dB.
DC Output Offset: < ±5 mV.
THD: Less than 0.5% at rated power at 1 kHz.
Input Sensitivity (for full output at maximum
gain): 800 mV.
Input Impedance (nominal): 100 kilohms.
Minimum Load Impedance:
100V output: 160 ohms.
70V output: 80 ohms.
4-ohm output: 4/8 ohms.
Crosstalk (all controls at “10”): –70 dB at
1kHz.
Line Output Level (nominal): 1V into 10
kilohms.
AC Line Voltages Available:
100V 50/60 Hz
120V 60 Hz
220V 50/60 Hz
230V 50/60 Hz
240V 50/60 Hz
Operating Temperature/Humidity: 0° C to 40°
C at 95% relative humidity (non-condensing).
Storage Temperature: –20° C to 85° C.
Front Panel Controls and Indicators
Power Switch: Pushbutton on-off switch.
The power switch does not affect the 24V DC
auxiliary power input.
Power Indicator: Blue LED indicates power on.
Output Signal Presence Indicator: Green LED,
one for each output channel, illuminates when
output signal level exceeds 100 mV (45 dB
below full power) from the 4-ohm tap.
Clip Indicators: Red LED, one per output
channel. Illuminates at threshold of audible
distortion.
Master Volume Controls: One per output chan-
nel. Detented potentiometer with knob.
Tone Controls: Bass and Treble non-detented
potentiometers on each channel. Bass ±10 dB
at 100 Hz, Treble ±10 dB at 10 kHz.
Back Panel Controls and Connectors
Reset Switch: Resets the circuit breaker that
protects the power supply. 220/230/240V units
have a fuse instead.
AC Power Inlet: Detachable IEC.
Auxiliary Power Input: 2-position terminal strip
for 24 VDC (±10%) backup power. Accepts up
to 14 AWG terminal forks.
Amplifi er Outputs Connectors: One per
channel, 4-position terminal strip with COM
(Common), 4 ohms, 70V and 100V terminals.
Accepts up to 10 AWG terminal forks. Non-
touch cover included.
Output VCA Connector: One for every two chan-
nels, 4-pin Phoenix-type connector for two VCA
control lines of +10 VDC and ground. Compat-
ible with Crown 1-VCAP and 4-VCAP modules.
Line Out Connector: One 3-pin balanced Phoe-
nix-type connector per output channel. Post
master, pre-VCA. Level controlled by master
volume control.
Amp Input Connector:
3-pin Phoenix-type, high-impedance balanced,
one per amplifer channel.
Cooling
Convection cooled.
Protection
Current Limit Protection: Included.
Thermal Limit Protection: Over-temperature
thermal cutout.
DC-Fault Load Protection: Included.
Included Accessories
Power cord
Detachable rack ears
Screws for rack ears
Non-touch cover for output connectors
Phoenix-type connectors
Spade lugs
Optional Accessories
1-VCAP remote volume control for one channel.
4-VCAP remote volume control for four chan-
nels.
Dimensions
EIA Standard 19-inch (48.3-cm) rack mount
width (EIA RS-310-B) with rack ears, 3.5-inch
(8.9-cm) height and 12.2-inch (31.0-cm) depth
behind the mounting surface (not including non-
touch cover). 4.1 inches (10.5 cm) high includ-
ing feet. 13.9 inches (35.2 cm) deep from front
of knobs to back of non-touch cover.
Weight
Net Weight:
180A: 21.0 lb (9.5 kg)
280A: 25.3 lb (11.5 kg)
1160A: 25.3 lb (11.5 kg)
Shipping Weight:
180A: 26.0 lb (11.8 kg)
280A: 30.3 lb (13.7 kg)
1160A: 30.3 lb (13.7 kg)
Regulatory Certifications
9/07 138118-2A