Omnitronic E-1300, User Manual

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00043864.DOC, Version 1.1 27/32
7.2 Speaker outputs
In stereo mode, the amplifier can operate two speakers or two speaker groups. The amplifier can be
switched over to bridge operation to supply the double output power. Then it operates as 1-channel amplifier
and supplies power to one 8 speaker or one 8 speaker group. For connecting speakers, Speaker jacks
or pairs of screw connectors are provided. When using the Speaker jacks, turn each plug to the right until it
locks into place. For unlocking, pull the unlock button and turn the plug to the left.
• Occupation Speaker socket:
Channel 1 and 2 Mono operation
1+ 1– 1+ 1–
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)
3 speakers at 8 each 24 (in line)
4 speakers at 8 each 2 (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 speaker 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 %.
General information on installing cables
• 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.
7.2.1 Stereo operation
The most frequently used operating mode of an amplifier is stereo operation, where both channels are
operated independent of each other. The highest output power during stereo operation is achieved by
connecting 4 speakers. With 8 speakers the output power will be slightly reduced. For stereo operation,
use both Speaker pairs or the pairs of screw connectors on the connector panel OUTPUT. Set the selector
switch for the operating mode to position “STEREO“.