Operation; Powering Up; Priority Ducking; Music-On-Hold - Crown Commercial Audio 140MAx Operation Manual

Commercial Audio Series Tuner-Mixer-Amplifiers

3 Operation

3.1 Powering Up

1. Turn off any equipment connected to the Line Out connectors.
2. Plug the amplifier's power cord into a 3-wire grounded AC outlet.
3. Turn down the input volume controls.
4. Turn down the master volume control.
5. Turn on the Power switch. The Power indicator should glow.
6. Turn the input volume controls in use about 3/4 up.
7. Turn up the master volume control(s) until the desired loudness or power
level is achieved.
8. Touch up the input levels as needed for equal loudness from each micro-
phone.
9. Turn on any equipment connected to the Line Out connectors.
If you ever need to make any wiring or installation changes, disconnect the
power cord.

3.2 Priority Ducking

If you want a microphone to duck (turn down) the background music, follow
this procedure. On the back of the 140MAx,
1. Connect a push-to-talk mic switch to the Priority Connector (Figure 3.1).
2. While talking into a microphone, adjust the VOX Threshold control on the
back of the unit. It controls how loud the voice must be before ducking occurs.
The control can be set for no ducking. The Active Indicator will illuminate
when ducking is active.
3. Adjust the Priority Release control on the back of the unit. It adjusts the
release time of the VOX ducking.

3.3 Music-On-Hold

On the back of the unit, adjust the MOH Level Control to obtain the desired
Figure 3.1 Priority Ducking Controls
level of Music-On-Hold on your phone system.
and Connectors
Operation Manual
page 12