Crown Audio 180MA Back Panel Controls and Connectors, J. Reset Switch, K. Auxiliary Power Input

Commercial Audio Series Mixer-Amplifiers

1 Welcome

1.3 Back Panel Controls and Connectors

J. Reset Switch

Resets the circuit breaker that protects the power supply. 220/230/240V units have a fuse instead.

K. Auxiliary Power Input

2-position terminal strip for 24 VDC (±10%) backup power. Accepts up to 10 AWG terminal forks. NOTE: To

prevent a spark when attaching a battery, have unit turned on and connected to the mains supply.

L. Amplifier Outputs Connectors

One per channel, 4-position terminal strip with COM (Com- mon), 4 ohms, 70V and 100V terminals. Accepts up to 14 AWG terminal forks. Non-touch cover included.

M. Amp Config Switch

A DIP switch with two functions:

1.Assigns one of the inputs 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.

N. Input Routing Switch (280MA only)

DIP switches that assign each input signal to each output. Two switches per input.

O. Link In/Out Switch

Slide switch, one per channel. With the Link Switch IN, any signal applied to the Amp Input connector will be mixed with the input signal(s). With the Link Switch OUT, only the signal from the Amp Input Connector will appear at the amplifier output.

P. Mic/Line Input Connector

3-pin Phoenix-type, balanced, one per input channel.

Q. Mic/line Switch

Selects mic-level or line-level input signals. One switch for each balanced input.

R. Dual RCA Input Connector

For stereo music signals, unbalanced, summed together,

two connectors per input channel. If required, both the mic/ line and RCA inputs may be used at the same time. The mic/ line gain switch does not affect the RCA gain, which is fixed relative to mic/line. The mic/line and RCA signals are mixed. Note: Other equipment connected to the RCA jacks should be connected to the same AC power source as the mixer-amp to avoid hum.

S. AC Power Inlet

Detachable IEC.

T. Priority Connector

3-pin Phoenix-type connector allows Input 1 or Input 5 (280MA only) to mute other input signals by contact clo- sure.

U. Output VCA Connector

4-pin Phoenix-type connector for one (180MA) or two (280MA) VCA control lines of +10 VDC and ground. Com- patible with Crown 1-VCAP and 4-VCAP modules.

V. Amp Input Connector

3-pin Phoenix-type, high-impedance balanced, one per amplifier channel. Used to link an additional mixer to the

mixer-amplifier. Or used to connect an external processor (see Section 2.9).

W. Line Out Connector

One 3-pin balanced Phoenix-type connector per output channel. Post master, pre-VCA. Level controlled by master volume control.

X. Tone Generator Connector

5-pin Phoenix-type connector. Tones include Pre-Announce Chime, Bell, Alert Tone, and Evacuate Tone. All tones are activated by contact closures on the connector.

Y. Tone Level

One potentiometer per output channel sets the volume of the tones. Tone level is not affected by output volume con- trols or VCAs.

The Pre-Announce Chime is a special case. It is mixed with Channel-1 signals, so its level will be affected by the master volume control and VCAs.

NO FUNCTION

S

Operation Manual

Figure 1.2 Back Panel Controls and Connectors
(280MA shown)	page 7