Connections; Choosing An Appropriate Pa Amplifier; Operating Modes - PSSO K Serie Bedienungsanleitung

10 dB Heartbeat
20 - 30 dB Whisper
40 dB Average home
50 dB Light traffic
60 dB Normal conversation
70 dB Vacuum cleaner
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4

CONNECTIONS

Choosing an Appropriate PA Amplifier

This speaker system must only be connected to an appropriate power amplifier. The amplifier power must
correspond with the speaker system power. An amplifier with too little power can also destroy a speaker
system with a higher power range.
Before starting with the installation, you must clarify how many speaker systems you would like to install in
the room. In order to increase the sound pressure level two speaker system pairs should be connected with
the power amplifier. Please note that the impedance is only half the value when you connect two speaker
systems with one channel of the power amplifier. Please make sure that the power amplifier is qualified for
this operation mode.
When connecting further speaker system pairs (e.g. 3 pairs) to the same power amplifier, the impedance
lowers even further. You must always make sure that the power amplifier is qualified for the new impedance.
If the impedance of the speaker system is lower than the lowest allowed amplifier impedance, the amplifier
and the speaker systems may be damaged.
Furthermore, you must define the operation mode for your system. If the power amplifier is to be used in
stereo mode, the power is lower as in e.g. mono bridged mode. The following descriptions refer to PSSO
power amplifiers. You may also use other appropriate power amplifiers.

Operating modes

The most frequently used operating mode of an amplifier is stereo operation with 4 Ω speaker, where both
channels are operated independent of each other.
In parallel operation the amplifier can be operated in mono mode, i.e. via one input channel. The voltage
remains the same, the current is doubled. Consequently, the output impedance is limited to the minimum
value of one individual channel.
In bridge operation the amplifier can be operated in mono mode, i.e. via one input channel. The voltage is
doubled and subsequently also the output impedance. For stereo operation two amplifiers are needed.
Always make sure the power amplifier's selector switch for the operating mode is set accordingly.
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
The input impedance of the speaker systems should at least be the same or even higher than the output
impedance of the amplifier.
W W W . P S S O . D E
Overview on the Different Noise Levels
80 dB
90 dB Pneumatic drill
100 dB Power mower
120 dB Boom box in car
130 dB Pain level
140 dB Jet plane 30 meters overhead
≙ ≙ ≙ ≙ Impedance
8 Ω
4 Ω (parallel)
16 Ω (in line)
2.66 Ω (parallel), only for amplifiers capable of handling 2 Ω
24 Ω (in line)
2 Ω (parallel), only for amplifiers capable of handling 2 Ω
23
Heavy traffic or telephone ringing