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Specifications – Crown Audio CTs 2-Channel User Manual

Page 29

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COMMERCIAL AUDIO

• 29

www.crownaudio.com

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.

Amplifi er 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-amplifi er. 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 amplifi er output.

Priority Connector: 3-pin Phoenix-type connec-
tor for push-to-talk mic contact closure. Input
1 is the priority input for the amplifi ed 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