Commercial Audio Series
Mixer-Amplifiers
page 7
Operation Manual
1 Welcome
Figure 1.2 Back Panel Controls, Connectors and Indicators
P. Music-On-Hold Section
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 out-
put.
MOH 1V RCA Connector: Two mono RCA connectors for 1V output
(in parallel with 600-ohm connections so they are isolated).
Q. Input 4 Section
Balanced Input Connector: Detachable 3-pin Phoenix style connector
for balanced line-level signals, one per input channel.
Dual RCA Input Connector:
For stereo music signals, unbalanced,
summed together, two connectors per input channel.
R. Input 3 Section
Same as Input 4 Section.
S. Input 2 Section
Same as Input 4 Section.
T. Input 1 Section
Balanced Input Connector: Detachable 3-pin Phoenix style connector
for balanced mic-level or line-level signals.
Dual RCA Input Connector:
For stereo music signals, unbalanced,
summed together.
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.
Tel Connector: Transformer-isolated 600-ohm input connector,
summed into Input 1 for paging from a telephone system.
U. AC Power Inlet:
Detachable IEC.
V. Priority Section
Active indicator: Illuminates when VOX ducking is active.
VOX Threshold: Trim pot controls how loud the voice must be before
ducking occurs. Can be set for no ducking.
Priority Connector: 3-pin Phoenix-type connector for push-to-talk
mic contact closure. Input 1 is the priority input for the amplified out-
put, so Input 1 ducks the other inputs. Threshold of activation
depends on input voltage. Ducking does not affect MOH outputs.
Priority Release: Trim pot sets the release time of VOX ducking.
1.3 Back Panel Controls, Connectors and Indica-
tors
J. Reset Switch:
Resets the circuit breaker that protects the power
supply.
K. Amplifier Output Connector:
4-position terminal strip with
COM (Common), 4 ohms, 25V and 70V terminals. Accepts up to 10
AWG terminal forks. Non-touch cover included.
L. Preamp Line Out Connector:
3-pin balanced Phoenix-type
connector. Post master, pre-VCA. Level controlled by master volume
control.
M. Link In/Out Switch:
Slide switch.
When set to IN, any signal
applied to the Amp Input connector will be mixed with the input sig-
nal(s). When set to OUT, only the signal from the Amp Input Connec-
tor will appear at the amplifier output.
N. 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.
O. Output VCA Connector:
4-pin Phoenix-type connector for two
VCA control lines of +10 VDC and ground. Compatible with Crown
1-VCAP module.
Summary of Contents for 140MPA
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