Crown Audio 140MPA 1Welcome, Commercial Audio Series Mixer-Amplifiers, page, Q. Input 4 Section

Commercial Audio Series Mixer-Amplifiers

1Welcome

1.3Back 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-pinPhoenix-type connector for two VCA control lines of +10 VDC and ground. Compatible with Crown 1-VCAP module.

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.

Figure 1.2 Back Panel Controls, Connectors and Indicators

Operation Manual page 7