Omnitronic MPZ 180.6 Bedienungsanleitung Seite 20

Zone Outputs
For the six PA zones, PA speakers with 100 V audio transformer can be connected to the zone outputs.
Notes
The input impedance of the speaker systems should at least be the same or even higher than the output impedance of
the amplifier. Refer to this example for the calculation number of speakers/impedance:
Number of speakers
speaker at
1 8 Ω
speakers at
2 8 Ω each 4 Ω (parallel)
speakers at
2 8 Ω each 16 Ω (in line)
speakers at
8 Ω each 2.66 Ω (parallel)
3
speakers at 8 Ω each 24 Ω (in line)
3
speakers at
4 8 Ω each 2 Ω (parallel)
Choosing appropriate speaker cables
• Speaker systems must only be connected via sufficiently dimensioned cables. Thin cables lead to cable heatup or
enormous power loss and loss in sound quality. For all speaker systems up to 400 Watts, we recommend a cable
diameter of 2.5 mm², for all other speaker cables 4 mm².
• A high damping factor of your amplifier supplies a clear sound reproduction. Unnecessarily long and thin cables will
influence the damping factor and thus the low frequencies in a negative way. In order to safeguard good sound quality,
the damping factor should lie around 50. The longer a cable has to be, the thicker it should be. In this respect, a
damping factor of 200 will be reduced to 47 (8 ohms) when using a 10 m long, 2.5 mm² speaker cable. The power loss
at 8 ohms is 1.63 %, at 4 ohms 3.25 % and at 2 ohms even 6.5 %.The maximum cable length is 30 meters.
General information on installing cables
• Always treat cables carefully and protect them from damages during transportation.
• Install cables always in a structured way and protect them from damage.
• Cables must be installed in a way that no person can stumble over them. Always fix cables with an appropriate tape.
• Cables should be installed directly (no loops, S-shaped overlengths).
• Always install cables far away from power cables (never closely parallel).
• Never put heavy objects like speaker systems, flightcases etc. on cables.
• Never operate cables wound up.
Line Output
For connection to units with line level (e.g. mixer, amplifier) the stereo RCA output [LINE OUTPUT] can be
used.
Microphones
Three unbalanced inputs are available for connecting dynamic microphones: two via 6.3 mm plug at the rear
inputs [MIC 2 INPUT] and [MIC 3 INPUT], and one via XLR or 6.3 mm plug at the front combo input
[PRIORITY MIC 1]. The XLR jack is equipped with a lock which is released by pressing the PUSH lever
down and pulling the microphone plug out at the same time. Input [PRIORITY MIC 1] features an adjustable
priority function.
Units with Line Level
Three audio units with line level can be connected to the stereo RCA inputs [LINE 1] to [3].
Connection with the mains
Finally connect the device to a mains outlet (230 V AC, 50 Hz ~) with the mains cable.
≙ Impedance
8 Ω
20 • EN