User manual

00053940.DOC, Version 3.1
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4.4 Making the connections
S
tep 1: If the PA system is turned on, turn it off before making any connection.
Step 2: Connect the speaker with suitable speaker cables to the amplifier. Connect the positive pole of
the amplier to the red terminal and the negative pole of the amplier to the black terminal.
Step 3: When connecting several speakers, make sure that all speakers have the same polarity and that
the amplifier is not overloaded.
4.5 Information on speaker cables
• Speaker systems must only be connected via sufficiently dimensioned cables. Cables that are too thin 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 %.
• Both cables should be of the same kind and have the same length.
• The maximum cable length should not exceed 30 meters.
• Always treat cables carefully and protect them from damages during transportation.
• Install cables always in a structured way and protect them from damage.
• Cables must be installed in a way that no person can stumble over them. Always fix cables with an
appropriate tape.
• Cables should be installed directly (no loops, S-shaped overlengths).
• Always install cables far away from power cables (never closely parallel).
• Never put heavy objects like speaker systems, flightcases etc. on cables.
• Never operate cables wound up.
5. OPERATION
After having connected the speaker system, turn all level controls of the amplifier to zero to avoid a possible
switching-on noise. The last device to be switched on is the power amplifier. Now adjust the volume with the
level controls. Always make sure that the output signal is not distorted, otherwise your speakers may be
damaged.
During operation, please make sure the speaker always sounds well. When distortions can be heard, either
the amplifier or the speaker is overloaded. Overloads can quickly lead to amplifier or speaker damage. In
order to avoid damage, please reduce the volume immediately when distortions can be heard. When
speakers are destroyed by overload, the guarantee becomes void.
Always check the sound pressure level with a meter in order to keep to the threshold.
If you want to switch off the system, switch off the power amplifier first and then the pre-amplifiers in order to
avoid acoustic shocks on the speakers.