Installation; Connections - Omnitronic PAP Series User Manual

4 Installation

This amplifier is built for 483 mm racks (19"). This rack should be a double-door rack where front panel and
rear panel can be opened. The rack should be provided with a cooling fan. When mounting the amplifier into
the rack, please make sure that there is enough space around the device so that the heated air can be
passed on. Steady overheating will damage your device.
You can fix the amplifier with four screws M6 in the rack. If several devices are to be installed, make sure
that you leave 1 unit (1 U) space between the devices. Be careful when mounting the amplifier into the rack.
Put the heaviest devices into the lower part of the rack. Be aware that fastening the amplifier with four
screws on the front panel is not enough. In order to ensure safety, additional fastening by using ground and
side bars is necessary.
If racks are to be transported or used for mobile use, fasten the devices additionally by connecting the rear
brackets with the side or ground bars of the rack. Thus, the amplifier cannot be pushed backwards. The front
panel alone is not designed to absorb acceleration forces occurring during transportation.

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 or 100 V audio transformer or 4-16 Ω speakers or speaker groups with a total
impedance of at least 16 Ω can be connected.
• Connect PA speakers to the terminals "COM" (negative pole) and "100 V" or "70 V".
• Connect low-impedance speakers to the terminals "COM" (negative pole) and "4-16 Ω" (positive pole).
• When connecting, observe the correct polarity (positive and negative connections). The terminal "COM" is
always the negative pole. The positive connection of the speaker cables is always specially marked.
The total load must not exceed 60 W
(PAP-350), 650 W
RMS
overload.
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
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
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.
DANGER TO LIFE!
(PAP-60), 120 W
RMS
(PAP-650), or 1000 W
≙ Impedance
8 Ω
4 Ω (parallel)
16 Ω (in line)
2.66 Ω (parallel)
24 Ω (in line)
2 Ω (parallel)
(PAP-120), 240 W
RMS
(PAP-1000), otherwise the amplifier may be damaged by
RMS
19 • EN
(PAP-240) 350 W
RMS RMS