he Crown
®
180MA, 280MA and 1160MA are
high-value mixer-amplifi ers for commercial
and industrial audio. They provide 4-ohm
and constant-voltage outputs (70V and 100V).
Some applications include schools, hospitals,
factories, restaurant/retail, houses of worship,
fi tness facilities, A/V boardrooms, prisons, and
small offi ces. Typical uses are paging, background
music, security and evacuation instructions.
The mixer-amps vary in their number of inputs,
number of outputs, and power range:
• 180MA has 4 inputs and one 80W power ampli-
fi er for single-zone systems.
• 280MA has 8 inputs and dual 80W power ampli-
fi ers for two-zone systems.
• 1160MA has 4 inputs and one 160W power
amplifi er for single-zone systems.
Input routing allows each input to be assigned to
any output. This drastically reduces the need for
additional mixers or amplifi ers (or both) when
systems require either more inputs or outputs.
However, each mixer-amplifi er can be upgraded as
a facility expands. For example, you can add more
mixers for more inputs, or add more power amps
to handle more zones.
Other features include priority muting, phantom
power, and capability for remote volume control.
Specifi cations
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):
Balanced mic inputs: 3 mV.
Balanced line inputs: 800 mV.
RCA connectors: 400 mV.
Input Impedance (nominal):
Mic: 400 ohms.
Line: 100 kilohms.
RCA: 50 kilohms.
Crosstalk: –70dB at 1kHz.
Line Output Level (nominal): 1V into 10 kilohms.
Phantom Power: 15 VDC.
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/Humidy: 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.
Input Volume Controls: Microphone/line, four in
180MA and 1160MA, eight in 280MA. Detented
potentiometers with knobs.
Tone Controls: Bass and Treble non-detented
recessed potentiometers on each input channel.
Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz.
Power Indicator: Blue LED indicates power on.
Input Signal Presence Indicator: Green LED, one
for each input channel, illuminates when input
signal exceeds –24 dBu (line) or –70 dBu (mic).
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. Does not respond
to signals from the AMP INPUT connector.
COMMERCIAL AUDIO SERIES
• 4 or 8 inputs, 1 or 2 amplifi er output channels
• Ideal for commercial and industrial use
• Balanced Phoenix-type mic/line inputs;
touch-proof screw-terminal speaker outputs
• Any input can be sent to any output
• Priority muting
• Independent bass and treble controls for
each input
• Three-Year, No-Fault, Fully Transferable
Warranty completely protects your invest-
ment and guarantees its specifi cations
Features
1 kHz
Power
80W
Minimum guaranteed power
into 4 ohms or 70V/100V output
180MA
*1 kHz Power: refers to maximum power in watts at
1 kHz with 0.5% THD.
*
1 kHz
Power
80W
Minimum guaranteed power
per channel into 4 ohms or
70V/100V output
280MA
*1 kHz Power: refers to maximum power in watts at
1 kHz with 0.5% THD.
*
1 kHz
Power
160W
Minimum guaranteed power
into 4 ohms or 70V/100V output
1160MA
*1 kHz Power: refers to maximum power in watts at
1 kHz with 0.5% THD.
*
180MA
280MA
1160MA
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