Crown 280MA

Crown’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, prisons, and small offices. Easily configured for a range of uses such as paging, background music, security, and evacuation instructions, Crown’s Commercial Audio units are the smart choice for commercial sound.

  The 180MA has 4 inputs and one 80W power amplifier
  The 1160MA has 4 inputs and one 160W power amplifier
  The 280MA has 8 inputs and dual 80W power amplifiers

Features
  4 to 8 inputs, 1 to 2 amplifier output channels
  Ideal for commercial and industrial use
  Expandable by adding Crown Commercial Audio Series mixers or power amplifiers
  Balanced Phoenix-type mic/line inputs; touch-proof screw-terminal speaker outputs
  Any input can be sent to any output
  Priority muting
  Three-Year, No-Fault, Fully Transferable Warranty completely protects your investment  and guarantees its specifications

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):
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.

Clip Indicators: Red LED, one per output channel.
Illuminates at threshold of audible distortion.
Does not respond to signals from the AMP INPUT
connector.
Output Volume Controls: One per output channel.
Detented potentiometer with knob.
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 14
AWG terminal forks. Non-touch cover included.
Output VCA Connector: 4-pin Phoenix-type
connector for two VCA control lines of +10 VDC
and ground. Compatible with Crown 1-VCAP and
4-VCAP modules.
Amp Confi g Switch: A DIP switch with two functions:
1. Assigns an input 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. Two
switches per input.
Line Out Connector: One 3-pin balanced Phoenixtype
connector per output channel. Post master,
pre-VCA. Level controlled by master volume
control.
The tone generator has been omitted. Call Crown Tech
Support if you have a tone generator question.
Input Connectors:
Mic/Line Connector: 3-pin Phoenix-type, balanced,
one per input channel.
Dual RCA Input Connector: For stereo music
signals, unbalanced, summed together, two connectors
per input channel.
Amp Input Connector: 3-pin Phoenix-type, highimpedance
balanced, one per amplifer channel.
Used to link an additional mixer to the mixeramplifi
er. Can be used to connect an external
processor.
Mic/line Switch: Selects mic-level or line-level
signals. 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 amplifi er output.
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 channels.
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 including feet. 13.9
inches (35.2 cm) deep from front of knobs to back
of non-touch cover.
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. (13.8 kg)
1160MA: 30.3 lbs. (13.8 kg)