Crown 28M

Crown’s Commercial Audio mixers deliver legendary Crown quality to the commercial audio industry. These high-value mixers are designed 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 14M has 4 inputs and 1 output channel
  The 28M has 8 inputs and 2 output channels

Features
  Ideal for commercial and industrial use
  Expandable by adding Crown Commercial Audio Series amplifiers or mixer-amplifiers
  Balanced Phoenix-type mic/line inputs
  Any input can be sent to any output channel
  Priority muting
  Three-Year, No-Fault, Fully Transferable Warranty completely protects your investment and guarantees its specifications

Specifications :

Performance
Frequency Response (at line out): 20 Hz to 20
kHz +/- 1 dB.
Signal to Noise Ratio (master volume at minimum):
100 dB.
THD: 0.05% typical with 800 mV balanced input,
1V output.
Input Sensitivity (volts RMS 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 (all controls at “10”): –50 dB at 1kHz.
Line Output Level (nominal): 1.2 V 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/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.
Input Volume Controls: Microphone/line, four in
14M, eight in 28M. Detented potentiometers 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
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.
Clip Indicators: Red LED, one per output channel.
Illuminates at threshold of audible distortion.
Output Volume Controls: One per output channel.
Detented potentiometer with knob.
Back Panel Controls and Connectors
Fuse: Protects the power supply.
AC Power Inlet: Detachable IEC.
Auxiliary Power Input: 2-position terminal strip
for 24 VDC (±10%) backup power. Accepts up to
10 AWG terminal forks.
Mixer 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 (28M only) to mute
other input signals by contact closure.
Input Routing Switch (28M 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. Level controlled
by master volume control.
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.
The tone generator has been omitted. Call Crown
Tech Support if you have a tone generator question.
Mic/line Switch: Selects mic-level or line-level
signals. One switch for each balanced input.
Included Accessories
Power cord
Detachable rack ears
Phoenix-type connectors
Spade lugs
Dimensions
EIA Standard 19-inch (48.3-cm) rack mount width
(EIA RS-310-B) with rack ears, 1.7-inch (4.3-cm)
height and 10.7-inch (27.18-cm) depth behind the
mounting surface.
Weight
Net Weight:
14M: 8.7 lb (3.9 kg)
28M: 8.7 lb (3.9 kg)
Shipping Weight:
14M: 14 lb (6.4 kg)
28M: 14 lb (6.4 kg)