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COMMERCIAL AUDIO
T
he Crown
®
140MPA is a high-value mixer-amplifier for commercial audio. It provides 4-ohm and
constant-voltage outputs (25V and 70V). Typical uses are paging, background music, and music-
on-hold. The unit provides 4 inputs (each with a volume control) and a 40W amplifier output. Other
features include priority ducking, phantom power, and capability for remote volume control. Multiple
units can be linked.
SPECIFICATIONS
Performance
Frequency Reponse (at 1 watt from 4-ohm
tap): 50 Hz to 15 kHz ± 1 dB.
Frequency Response (at line out): 50 Hz to 15
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): >90 dB.
DC Output Offset: < ±5 mV.
THD: < 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:
120V/60Hz. Line voltage tolerance +15%,
–20%.
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.
Input Volume Controls: Four controls, one per
input. Detented potentiometers with knobs.
Tone Controls: Bass and Treble non-detented
recessed potentiometer 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 –40 dBu.
Output Signal Presence Indicator: Green LED
illuminates when output signal level exceeds
100 mV (45 dB below full power) from the
4-ohm tap.
Clip Indicator: Red LED on output illuminates
at threshold of audible distortion.
Master Output Volume Control: Detented
potentiometer with knob.
Back Panel Controls, Connectors and
Indicators
Reset Switch: Resets the circuit breaker that
protects the power supply.
AC Power Inlet: Detachable IEC.
Amplifier Output Connector: 4-position termi-
nal strip with COM (Common), 4 ohms, 25V
and 70V terminals. Accepts up to 10 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
module.
Priority Connector: 3-pin Phoenix-type connec-
tor for push-to-talk mic contact closure.
Preamp Line Out Connector: 3-pin balanced
Phoenix-type connector. Post master, pre-VCA.
Level controlled by master volume control.
MOH 1V Level Control: Trim pot adjusts level
for Music-On-Hold 1V output.
MOH 1W Level Control: Trim pot adjusts level
for Music-On-Hold 1W output.
MOH SPI Indicator: Flashes when MOH signal
is present.
MOH 1V Phoenix Connector: 3-pin Phoenix
connector for 1V, 600-ohm transformer-isolated
output.
MOH 1W Phoenix Connector: 3-pin Phoenix
connector for 1W output.
MOH 1V RCA Connector: Two mono RCA con-
nectors for 1V output (in parallel with 600-ohm
connections so they are isolated).
Balanced Input Connector: Detachable 3-pin
Phoenix style connector for balanced line-level
signals, one each for input channels 2-4.
Balanced Input Connector: Detachable 3-pin
Phoenix style connector for balanced mic-level
line-level signals, for input channel 1.
Tel Connector: Transformer-isolated 600-ohm
input, summed into Input 1 for paging from a
telephone system.
Dual RCA Input Connector: For stereo music
signals, unbalanced, summed together, two
connectors per input channel.
Amp Input Connector: 3-pin Phoenix-type,
high-impedance balanced. Used to link an
additional mixer to the mixer-amplifier. Can be
used to connect an external processor.
Mic/line Switch: Selects mic-level or line-level
signal for Input 1.
Phantom Power Switch: Turns phantom power
on or off for Input 1.
VOX Threshold: Trim pot controls how loud the
voice must be before ducking occurs. Can be
set for no ducking.
Link In/Out Switch: Slide switch. When set to
IN, any signal applied to the Amp Input connec-
tor will be mixed with the input signal(s). When
set to OUT, only the signal from the Amp Input
Connector will appear at the amplifier output.
Priority Connector: 3-pin Phoenix-type connec-
tor for push-to-talk mic contact closure. Input
1 is the priority input for the amplified output,
so Input 1 ducks the other inputs. Threshold of
activation depends on input voltage. Ducking
does not affect MOH outputs.
Active Indicator: Illuminates when VOX ducking
is active.
Cooling
Convection cooled.
Protection
Current Limit Protection: Included.
Thermal Limit Protection: Over-temperature
thermal cutout.
DC-Fault Load Protection: Included.
Turn On/Turn Off: No thumps or pops.
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
Dimensions
Width (without rack ears): 17.3 in. (43.8 cm).
Width (with rack ears): EIA Standard 19 in. W
(EIA RS-310-B).
Height (front panel): 3.5 in. (8.9 cm).
Height (including feet): 4.1 in. (10.5 cm).
Depth (front panel to back panel): 12.2 in. (31.0
cm).
Depth (front of knobs to back of non-touch
cover): 13.9 in. (35.2 cm).
Weight
Net Weight:
17 lb (7.7 kg).
Shipping Weight:
22 lb (9.98 kg).
Regulatory Certifications
1/06 139430-1