Crown 1160MA, Operation Manual

Commercial Audio Series

 Mixer-Amplifiers

page 11

Operation Manual

One DIP-switch selection enables Channel 1 as the priority input, which 
mutes all other inputs to Amp 1. In the 280MA only, another DIP switch 
selection enables Channel 5 as the priority input, which mutes all other 
inputs to Amp 2. In the 280MA only, another set of DIP switches enable 
Channel 1 as the priority input into both Amp 1 and Amp 2, effectively 
muting any input. 
 

To set the mixer-amplifier for normal mode with no priority:

Set the AMP CONFIG DIP switch as follows:
1 ON
2 OFF
3 OFF
4 OFF
5 ON
6 OFF

To give priority to the Channel-1 input in Amp 1 only:

Set the AMP CONFIG DIP switch as follows:
1 OFF
2 ON
3 OFF
4 OFF

Also, wire a SPST switch to the PRIORITY connector between COM and 
CH 1 AMP 1. Close the switch when you want the Channel-1 input to 
mute all other inputs feeding Amp 1.

To give priority to the Channel-5 input in Amp 2 only:

Set the AMP CONFIG DIP switch as follows:
5 OFF
6 ON

Also, wire a SPST switch to the PRIORITY connector between COM and 
CH 5 AMP 2. Close the switch when you want the Channel-5 input to 
mute all other inputs feeding Amp 2.

2.6 Input Routing

In the 280MA, any input can be assigned to Amp 1, Amp 2 or both. The 
two DIP switches labeled INPUT ROUTING are used (Figure 2.8). Follow 
the settings printed on the back panel next to the INPUT ROUTING switch. 
For example, to send input Channel 3 to Amp 1 and Amp 2, turn on DIP 
switches 13 and 14.

2.7 Phantom Power

To turn on phantom power on all mic inputs, turn on the switch number 7 
in the AMP CONFIG DIP switch.

2.8 Priority Muting

A back-panel AMP CONFIG DIP switch (Figure 2.9) can assign Input Ch. 
1 or Input Ch. 5 as the priority input for each amplifier output, which tem-
porarily mutes the remaining inputs. Muting is activated by contact clo-
sures. 

For example, suppose you configured Channel 1 as the priority input. Mic 
1 is plugged into Channel 1. A press-to-talk switch in Mic 1 is wired to 
the Priority connector in the mixer-amplifier. When you press the mic 
switch, all other signals are muted so you can make an announcement on 
Mic 1.

Figure 2.8  Input Routing DIP Switches

Figure 2.9 AMP CONFIG DIP Switch

To give priority to the Channel-1 input in Amp 1 and Amp 2:

Set the AMP CONFIG DIP switch as follows:
1 OFF
2 ON
3 ON
4 ON

Also, wire a SPST switch to the PRIORITY connector between COM and 
CH1 AMP 1. Close the switch when you want the Channel-1 input to 
mute all other inputs feeding Amp 1 and Amp 2.

Note: The routing configuration is extremely versatile. Many configura-
tions for additional applications not highlighted in this document can be 
created by examining the signal flow in the block diagram on page 13.

2.9 Link In/Out Switches

These switches (Figure 2.10) affect which signals are heard when another 
mixer is wired to the mixer-amplifier. One switch is included per amplifier 
channel.
IN: Any signal applied to the AMP INPUT connector will be mixed with 
the input signal(s).
OUT: Only the signal from the AMP INPUT connector will appear at the 
amplifier output. 

How to link another mixer to your mixer-amplifier:

Connect the extra mixer’s LINE OUT connector to the mixer-amplifier’s 
AMP INPUT connector. Set the Link switch to IN. 

How to set up Music-On-Hold output:

Connect mixer-amp LINE OUT to Music-On-Hold input on telephone 
system interface/PBX. Set the LINK SWITCH to IN.

How to set up a processing loop:

Connect mixer-amp LINE OUT to processor input. Connect processor 
output to mixer-amp AMP INPUT connector. Set the Link switch to OUT.

Figure 2.10 

Link In/Out Switches