00042851.DOC, Version 1.0
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START-UP
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.
Choosing an appropriate power amplifier
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.
Example for the calculation number of speakers/impedance
Number of speakers
Impedance
1 speaker at 8
8
2 speakers at 8 each 4 (parallel)
2 speakers at 8 each 16 (in line)
3 speakers at 8 each 2.66 (parallel), only for amplifiers
capable of handling 2
3 speakers at 8 each 24 (in line)
4 speakers at 8 each 2 (parallel), only for amplifiers
capable of handling 2
Note:
The input impedance of the speaker systems should at least be the same or even higher than the
output impedance of the amplifier.
Operating modes
The most frequently used operating mode of a power amplifier is stereo operation, where both channels are
operated independent of each other. In parallel operation the power 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 power
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. Please also refer to the
diagrams at the end of this user manual.
