OMNITRONIC PAP-120 PA Amplifier [22/25] Outputs
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OMNITRONIC PAP-120 PA Amplifier [22/25] Outputs

OMNITRONIC PAP-120 PA Amplifier [22/25] Outputs
00041813.DOC, Version 1.2
22/25
• Occupation jack plug:
Balanced use of
Tip =
hot (+)
Sleeve =
Ground / Shield
Tip
Sleeve
Strain relief clamp
stereo 1/4" jack plugs
Ring =
cold (-)
Ring
For connection of balanced and
unbalanced plugs, ring and sleeve have
to be bridged at the stereo plug.
7.2 Outputs
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" and "100 V" or "70 V".
• Connect low-impedance speakers to the terminals "COM" and "4-16 Ω".
• When connecting, observe the correct polarity (positive and negative connections). The terminal "COM" is
always the negative pole.
Example for the calculation number of speakers/impedance
Nmber of speakers ≙ Impedance
3
1 speaker at 8 Ω 8 Ω
2 speakers at 8 Ω each 4 Ω (parallel)
2 speakers at 8 Ω each 16 Ω (in line)
3 speakers at 8 Ω each 2.66 Ω (parallel)
3 speakers at 8 Ω each 24 Ω (in line)
4 speakers at 8 Ω each 2 Ω (parallel)
• The input impedance of the speaker systems should at least be the same or even higher than the output
impedance of the amplifier.
Information on choosing appropriate connection cables
• Speaker systems must only be connected via sufficiently dimensioned cables. Too 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!
Information on installing speaker cables
• Always treat cables carefully and protect them from damages during transportation.
• Install cables always in a structured way and protect them from damage.

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