Installation; Connections; Speakers - Omnitronic MA Series User Manual

4 Installation

This amplifier is built for 19" racks (483 mm) but can also be used as a tabletop unit. In order to ensure sufficient cooling
of the amplifier, air must always be able to flow freely through all air vents. For rack installation, the amplifier requires
2 U. If several units are to be installed, make sure that you leave 1 unit space between the devices. Insert the heaviest
units into the lower part of the rack. The hot air given off by the amplifier must be dissipated from the rack; otherwise heat
will accumulate in the rack which may not only damage the amplifier but also other units in the rack. In case of
insufficient heat dissipation, install a ventilation unit into the rack.

5 Connections

Speakers

High voltage at terminals when using PA systems. Installation by skilled personnel only! Turn off
amplifier before connecting.
Either PA speakers with 70 V and 100 V audio transformers or 4-16 Ω speakers or speaker groups can be
connected. The total load must not exceed 60 W
or 360 W (MA-360P) otherwise the amplifier may be damaged by overload. When connecting, observe
RMS
the correct polarity (positive and negative connections). The positive connection of the speaker cables is
always specially marked
• 70/100 V: Connect PA speakers to the terminals "COM" (negative pole) and "70V" or "100V" (positive
pole).
• 4-16 Ω: Connect low-impedance speakers to the terminals "COM" (negative pole) and "4Ω", "8Ω" or "16 Ω"
(positive pole). When interconnecting several low-impedance speakers, it is especially important to obtain
the minimum impedance at the respective terminal. The input impedance of the speaker systems should at
least be the same or even higher than the output impedance of the amplifier.
Example for the calculation number of speakers/impedance:
Number of speakers
1 speaker at 8 Ω
2 speakers at 8 Ω each
2 speakers at 8 Ω each
3 speakers at 8 Ω each
3 speakers at 8 Ω each
4 speakers at 8 Ω each
DANGER TO LIFE!
(MA-60P), 120 W
RMS
≙ Impedance
8 Ω
4 Ω (parallel)
16 Ω (in line)
2.66 Ω (parallel)
24 Ω (in line)
2 Ω (parallel)
22 • EN
(MA-120P), 240 W
RMS
(MA-240P)
RMS