CONTROL_1_5_V_3_0.DOC
20/25
In order to relax the hearing sufficiently, the noise level should not exceed 70 dB(A) for 10 hours. Higher
noise levels during this relaxing period can prevent the relaxation and promote a permanent hearing damage
(Tinitus) or hearing loss.
Therefore:
Whoever wants to maintain his hearing should use hearing protectors!
START-UP
This speaker-system must only be connected with 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.
Suitable power amplifiers:
OMNITRONIC P-125 Amplifier, 2x65W/4Ohm
No. 10451105
OMNITRONIC P-250 Amplifier, 2x125W/4 Ohm
No. 10451110
OMNITRONIC P-500 Amplifier ,2x250W/4 Ohm
No. 10451130
The following descriptions refer to OMNITRONIC power amplifiers. You may also use other appropriate
power amplifiers.
Operation modes
Stereo operation
Normal operation mode of an amplifier, in which every channel gets its own signal. The most commonly used
mode of amplifiers is stereo-operation at 4 Ohms. Make sure that the operation-mode-switch is correctly set.
Calculation number of speakers – impedance
E.g. 1 speaker à 8 Ohm = 8 Ohm
2 speakers à 8 Ohm = 4 Ohm (parallel)
2 speakers à 8 Ohm = 16 Ohm (in line)
3 speakers à 8 Ohm = 2.66 Ohm (parallel), only for amplifiers capable of handling 2 Ohms
2 speakers à 8 Ohm = 24 Ohm (in line)
4 speakers à 8 Ohm = 2 Ohm (parallel), only for amplifiers capable of handling 2 Ohms
N.B.:
The input-impedance of the speaker-systems should at least be the same or even higher than the output-
impedance of the amplifier.
Parallel operation
Possibility to run the amplifier in mono-mode, i.e. via one input channel. In parallel operation mode, the
voltage remains the same, the current is doubled. Consequently, the output impedance is limited to the
minimum value of one individual channel.
Connect the input signal to the input-plug CH-1.
