Crown Audio Stereo Amplifier 280A User Manual

180A  
280A  
1160A  
C O M M E R C I A L A U D I O S E R I E S  
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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.  
T
Features  
1 or 2 inputs, 1 or 2 amplifier output chan-  
nels.  
breaker/fuse, and thermal protection; details  
The amplifiers vary in their number of inputs,  
number of outputs, and power range:  
Ideal for commercial and industrial use  
Three-Year, No-Fault, Fully Transferable War-  
ranty completely protects your investment  
and guarantees its specifications  
Balanced Phoenix-type line inputs; touch-  
proofed screw-terminal speaker outputs  
• 180A has 1 input and one 80W power amplifier  
for single-zone systems.  
Advanced protection system includes output  
current limiting, DC protection, circuit  
• 280A has 2 inputs and dual 80W power ampli-  
fiers for two-zone systems.  
• 1160A has 1 input and one 160W power ampli-  
fier for single-zone systems.  
Operating Temperature/Humidity: 0° C to 40° C  
at 95% relative humidity (non-condensing).  
Some applications include schools, hospitals,  
factories, restaurant/retail, houses of worship,  
fitness facilities, A/V boardrooms, prisons, and  
small offices. Typical uses are paging, background  
music, security and evacuation instructions.  
*1 kHz  
Power  
Storage Temperature: –20° C to 85° C.  
180A  
Minimum guaranteed power  
Front Panel Controls and Indicators  
into 4 ohms or 70V/100V output  
The sound system can be upgraded as a facility  
expands. For example, you can add more mixers  
for more inputs, or add more power amps (or  
mixer-amps) to handle more zones.  
80W  
Power Switch: Pushbutton on-off switch. The  
power switch does not affect the 24V DC auxiliary  
power input.  
*1 kHz Power: refers to maximum power in watts at  
1 kHz with 0.5% THD.  
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.  
Specifications  
Performance  
Frequency Reponse (at 1 watt from 4-ohm tap):  
70 Hz to 19 kHz +/- 1 dB.  
Clip Indicators: Red LED, one per output channel.  
Illuminates at threshold of audible distortion.  
Frequency Response (at line out): 20 Hz to 20  
kHz +/- 1 dB.  
Master Volume Controls: One per output channel.  
Detented potentiometer with knob.  
*
1 kHz  
Power Bandwidth (at 4-ohm tap, 2 dB below  
maxium 1 kHz power): 50 Hz to 20 kHz with  
< 0.5% THD  
280A  
Power  
Tone Controls: Bass and Treble non-detented  
potentiometers on each channel. Bass 10 dB at  
100 Hz, Treble 10 dB at 10 kHz.  
Minimum guaranteed power  
per channel into 4 ohms or  
70V/100V output  
Signal to Noise Ratio (ref. to rated power, master  
volume at minimum): 85 dB.  
80W  
Back Panel Controls and Connectors  
DC Output Offset: < 5 mV.  
*1 kHz Power: refers to maximum power in watts at  
1 kHz with 0.5% THD.  
Reset Switch: Resets the circuit breaker that  
protects the power supply. 220/230/240V units  
have a fuse instead.  
THD: Less than 0.5% at rated power at 1 kHz.  
Input Sensitivity (for full output at maximum  
gain): 800 mV.  
AC Power Inlet: Detachable IEC.  
Input Impedance (nominal): 100 kilohms.  
Auxiliary Power Input: 2-position terminal strip  
for 24 VDC ( 10%) backup power. Accepts up to  
14 AWG terminal forks.  
Minimum Load Impedance:  
100V output: 160 ohms.  
70V output: 80 ohms.  
Amplifier 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.  
4-ohm output: 4/8 ohms.  
*1 kHz  
Power  
Crosstalk (all controls at “10”): –70 dB at 1kHz.  
Line Output Level (nominal): 1V into 10 kilohms.  
1160A  
Minimum guaranteed power  
Output VCA Connector: One for every two chan-  
nels, 4-pin Phoenix-type connector for two VCA  
control lines of +10 VDC and ground. Compatible  
with Crown 1-VCAP and 4-VCAP modules.  
AC Line Voltages Available:  
100V 50/60 Hz  
120V 60 Hz  
220V 50/60 Hz  
230V 50/60 Hz  
into 4 ohms or 70V/100V output  
160W  
*1 kHz Power: refers to maximum power in watts at  
1 kHz with 0.5% THD.  
240V 50/60 Hz  
 

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