Specifications
COMMERCIAL AUDIO
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rown’s Commercial Audio mixer/amplifiers deliver legendary Crown quality to the commercial audio
industry. These high-value mixer-amplifiers provide both 4-ohm and constant-voltage outputs (70V
and 100V) for use in a wide range of commercial applications including schools, hospitals, factories,
restaurant/retail, houses of worship, fitness facilities, A/V boardrooms, correctional facilities, and small
offices. Easily configured for a range of uses such as paging, background music, security, and evacua-
tion instructions, Crown’s Commercial Audio units are the smart choice for commercial sound.
SPECIFICATIONS
Performance
Frequency Response: 30 Hz to 15 kHz ±1 dB at
line out.
Power Bandwidth: 50 Hz to 20 kHz with < 0.5%
THD at 2 dB below maximum 1 kHz power.
Signal to Noise Ratio: 85 dB, master volume at
minimum.
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:
Mic: 400 ohms.
Line: 100 k ohms.
RCA: 50 k ohms.
Crosstalk: –70dB at 1kHz.
Line Output Level (nominal): 1V into 10 kilohms.
Phantom Power: 15 VDC.
AC Line Voltage and Frequency Configurations
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: Push-button on-off switch.
Input Volume Controls: Microphone/line, four in
180MA and 1160MA, eight in 280MA. Detented
pots with knobs.
Tone Controls: Bass and Treble non-detented
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 sig-
nal exceeds –24 dBu (line) or –70 dBu (mic).
Output Signal Presence Indicator: Green LED,
one for each output channel, illuminates when out-
put signal level exceeds 100 mV.
Clip Indicators: Red LED, one per output channel.
Illuminates at threshold of audible distortion.
Output Volume Controls: One per output channel.
Detented pot with knob.
Back Panel Controls and Connectors
Reset Switch: Resets the circuit breaker that pro-
tects the power supply.
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.
Amplifier Outputs Connector: One per channel, 4-
position terminal strip with Com, 4 ohms, 70V and
100V terminals. Accepts up to 14 AWG terminal
forks. Non-touch cover included.
Output VCA Connector: 4-pin Phoenix-type con-
nector for two VCA control lines of +10 VDC and
ground. Compatible with Crown 1-VCAP and 4-
VCAP modules.
Amp Config Switch: A DIP switch with two func-
tions:
1. Assigns one of the inputs as the priority input
for each output, thereby temporarily muting the
remaining inputs. Muting is activated by contact
closure.
2. Global enable switch for phantom power. Does
not affect RCA inputs. Default position is off.
Priority Connector: 3-pin Phoenix-type connector
allows Input 1 or Input 5 (280MA only) to mute
other input signals by contact closure.
Input Routing Switch (280MA only): DIP switches
that assign each input signal to each output. One
switch per input.
Line Out Connector: One 3-pin balanced Phoenix-
type connector per output channel. Post master,
pre-VCA, with level control.
Tone Generator Connector: 5-pin Phoenix-type
connector. Tones include Bell, Pre-Announce
Chime, Alert Tone, and Evacuate Tone. All tones
are activated by contact closures on the connector.
Tone Level: One per channel, a rear-panel potenti-
ometer that sets the volume of the tones.
Input Connectors: Mic/Line Connector, 3-pin
Phoenix-type, low-impedance balanced, one per
input channel. Dual RCA for stereo music signals,
unbalanced, summed together, two connectors
per input channel. Amp Input Connector, 3-pin
Phoenix-type, high-impedance balanced, one per
amplifier channel. Used to link an additional mixer
to the mixer-amplifier.
Mic/line Switch: Selects mic-level or line-level sig-
nals. One switch for each balanced input.
Link In/Out Switch: Slide switch, one per channel.
With the Link Switch IN, any signal applied to the
Amp Input connector will be mixed with the input
signal(s). With the Link Switch OUT, only the signal
from the Amp Input Connector will appear at the
amplifier output.
Cooling
Convection cooled.
Protection
Current Limit Protection; Thermal Limit Protection
(over-temperature thermal cutout); DC-Fault Load
Protection.
Included Accessories
Power Cord. Detachable rack ears. Non-touch
cover for output connectors.
Optional Accessories
1-VCAP remote volume control for one channel. 4-
VCAP remote volume control for four channels.
Dimensions
EIA Standard 19-inch (48.3-cm) rack mount width
(EIA RS-310-B), 3.5-inch (8.9-cm) height and 14-
inch (35.6-cm) depth behind the mounting surface.
Weight:
Net Weight:
180MA: 21.0 lbs. (9.5 kg).
280MA: 25.3 lbs. (11.5 kg)
1160MA: 25.3 lbs. (11.5 kg).
Shipping Weight:
180MA: 26.0 lbs. (11.8 kg).
280MA: 30.3 lbs. (13.7 kg).
1160MA: 30.3 lbs. (13.7 kg).
Regulatory Certifications
Note: All measurements are related to 120VAC units 60
Hz in stereo mode with 8-ohm loads at 1-kHz at rated
power unless other otherwise specified. Specifications
for units supplied outside the U.S.A. may vary slightly
at different AC voltages and frequencies.