Manual

8
Appendix 1
Microphone compressor and ducker operation
A variable compressor eect is provided to help level out dierences in loudness caused by dierent microphone users. This also
helps prevent overload of the loudspeakers from any knock or pop noises received by the microphone or the diering mic
technique of various users. The “Compression Ratio” control adjusts the balance between compressed and uncompressed mic
signal. Fully counterclockwise delivers uncompressed audio, fully clockwise delivers only the compressor output.
The mix of the microphone signal into each zone is controlled by its “preset” rotary control, adjustable via a screwdriver on the front
panel. When the microphone signal exceeds a threshold the zone’s music level is reduced automatically to a level which allows the
microphone signal to be clearly heard. The rear panel “Ducker Floor” control adjusts the degree of music attenuation applied. The
“Ducker Release” control adjusts the time delay before the music fades back up again.
Note: The ducker will action will only take eect in zones whose front panel “mic vol” control is set above zero.
The “Control” line may be used to disable the remote wall control plate and revert to front panel control. If the “Control” line is
shorted to ground via a switch, the zone reverts to front panel control. A red LED back-illuminates the wall plate to indicate that that
the controls are disabled.
Appendix 2
Remote Zone Controller connections
Appendix 3
LOOP input and output connections
Pin No.
Connection
1 Ground
2
+3.3V
3
Control
4 Volume (DC voltage)
5
Source select (DC voltage)
6
+3.3V
7
Ground
8
+5V
Pin No.
Connection
1
Ground
2 -6V LOOP
3
+6V LOOP
4
SLAVE_DETECT (grounded by Master Loop-out)
5
MUTE_LOOP
6
RS-232_LOOP
7
DUCKER_LOOP
8
Ground
9 Master unit input source 1
10
Master unit input source 2
11
Master unit input source 3
12 Master unit input source 4
13
Master unit input source 5
14
Master unit input source 6
15 Mic Signal loop