www.cleveracoustics.co.uk
ZM4 4 Zone Mixer
User Manual
7
Operating instructions
18. Monitor (MIX) line output:
The monitor line output can be used to feed external amplification or recording equipment. The Monitor
line output provides an unbalanced (4V) signal following the front panel “monitor” selection. If several
zones are selected, the output will be a mixed signal of all the selected zones.
19. Monitor loudspeaker output (1W 8Ω):
Auxiliary connection for the connection of a small external loudspeaker for local monitoring purposes.
The nominal output is 1W with a minimum impedance of 8Ω. If none of the output zones are selected
using the monitor selection switches, the monitor output will be muted.
20. Priority control terminals (Music Mute):
When the terminals are short-circuited by means of a switch or relay (ie fire alarm panel), input
channels CH4 and CH5 will be muted, leaving input channels CH1, CH2 and CH3 with priority status.
Note: The TEL input carries highest priority and will override the Priority (Music Mute) function.
21. Telephone/paging input (TEL):
For emergency paging, the ZM4 is equipped with a balanced audio TEL input, activated automatically
upon the ZM4 detecting an audio signal present on the TEL input terminals. The input carries the
highest priority and will override all other inputs & priority functions on the amplifier.
22. Telephone/paging input zone selection & volume control:
The TEL input features zone control and input volume control. To route the TEL signal to a desired
output zone, move the corresponding DIP switch to the down (ON) position. The input volume for the
TEL signal may be controlled by the recessed volume control potentiometer. For most applications, it
may be best practice to set the minimum possible level to prevent unwanted activation of the priority
input. Turn the potentiometer clockwise to increase the volume.
23. Stereo LINE inputs:
A stereo audio input is provided for sources such as FM Tuners, CD Players or MP3 Players. The input
features a pair of unbalanced phono (RCA) inputs suitable for line level audio input.
24. Mono MIC/LINE inputs:
Channels 1, 2, 3 & 4 all feature mono audio inputs, each with selector for use with MIC/MIC+Phantom/
Line signals. The audio input is designed to accept a balanced audio signal via XLR or 6.35mm (¼”)
TRS jack.
25. Input sensitivity and phantom power control:
Channels 1, 2, 3 & 4 each feature switchable inputs for use with MIC/MIC+Phantom/Line signals. The
MIC position is designed to accept a balanced, low level signal from a standard dynamic microphone
(5mV/1kΩ). The PHANTOM position is designed to provide 15V phantom power across XLR pins 2 & 3
for use with condenser microphones. The LINE position is for use with line level sources such as radio
microphone receivers, CD players and FM tuners (100mV/10kΩ), the signal may be inputted using
either the balanced XLR or balanced TRS 6.35mm (¼”) jack.
