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CONTRACTOR PRECISION SERIES
10 Owner‘s Manual
2.9 Selecting the Mode Of Operation and Audio Output Cabeling
The MODE switch on the power amp‘s rear panel defines how the audio inputs handle the input signals. Possible settings are
DUAL, PARALLEL or BRIDGED.
DUAL
In DUAL mode, the two channels of the power amplifier work independent from each other. This mode
of operation is being used for all 2-channel applications, like stereo operation. Using the input level
controls on the power amp’s rear panel allows independently adjusting the channels’ amplification.
PARALLEL
In PARALLEL mode, the inputs of channel 1 and channel 2 are directly electrically linked. The audio
signal has to be applied to the input connectors of channel 1. Using the input level controls to
independently control the amplification of the two channels is still possible because only the channels’
inputs are linked. PARALLEL operation is the mode of choice, whenever the same input signal drives
multiple power amp channels of a large system installation.
See illustration right for connecting speakers in DUAL or PARALLEL
mode. The correct connection is also indicated at the amplifiers rear
panel.
BRIDGED
In BRIDGED mode both amp channels work in push-pull operation to provide doubled output voltage.
The audio signal has to be applied to the input connectors of channel 1, amplification is set via input
level control of channel 1 only.
Setting the MODE switch on the power amp‘s rear panel to BRIDGED lets the power
amplifier run in bridged mode operation and speaker connection has to be
established using pins 1+ und 2-, see illustration right. The correct connection is also
indicated at the amplifiers rear panel.
CAUTION:
In PARALLEL mode, the input signal has to be fed to input channel 1 only.
CAUTION:
In BRIDGED mode, the input signal has to be fed to input channel 1 only. Amplification is set
via input level control of channel 1 only.
In BRIDGED mode operation, it is not allowable for the load connected to fall below a value of
4 ohms. Extremely high voltages can be present at the output. The connected speaker sy-
stems must be able to handle such voltages. Make sure to completely read and fully observe
power rating specifications of the speaker systems to be used and to check them against the
output power capacity of the power amp.