7
CONTROLS AND INDICATORS
1 • RCA Front input connectors: To connect the Pre output leads of the main unit to the
amplifier input. These inputs control the final stages of the FRONT section.
2 • Adjustment of the gain of the Front Input: Adjusts input sensitivity of amplifier, which
can vary between 200 mV and 4V.
3 • Front Crossover switch: selects the output mode of the amplifier by activating the Low-
pass or High-pass filter.
a) Flat: the amplifier will reproduce the complete audio
range in relation to the signal applied to the input.
b) Low-pass: activation of the low-pass filter, i.e.
determination of the finishing-point of the low frequencies
present at the Front outputs .
c) High-pass: activation of the low-pass filter, i.e.
determination of the starting-point of the high frequencies
present at the Front outputs.
4 • Continuous adjustment/control of the Front Low-Pass or High-Pass
frequencies: once the low-pass or high-pass filter is inserted, the crossover
frequency can be adjusted in continuous mode between 30 Hz and 600 Hz.
5 • 4CH/2CH/ input mode switch: selects the input configuration of the
amplifier in the following ways:
a) "4ch": requires connection of all four input channels, so that they can all
function.
b) "2ch": If the main unit puts out two signals only, these must be connected to
the Front input, to allow all four output channels to function.
In this configuration the Rear inputs function as a By-pass output together with the
Front input. In other words, you will obtain exactly the same signal as far as form
and amplitude are concerned.
Note: Sensitivity adjustments will, in any case, remain independent.
6 • "4CH/3CH/2CH" Output mode switch: selects the output configuration of the amplifier in
the following ways:
a) "4ch" configuration using 4 output channels: In this mode the amplifier can
function with a double stereo system, front and rear.
b) "3ch" configuration using three output channels: In this mode the amplifier
can function with a stereo system in Front and a "bridged" mono system in
Rear.
c) "2ch" Configuration using 2 output channels: In this mode the amplifier can
be used as a traditional 2-channel stereo amplifier with twice the normal power.
Note: With the configuration “2ch out” the sensitivity adjustments become independent. In
other words, the Front section controls the sensitivity of the Left channel, while the Rear
section controls the sensitivity of the Right channel.
Hence, if the crossover has to be activated, only the crossover of the Rear section will be
activated, and consequently only its control for frequency adjustment will be active.
Flat Low High
20Hz 30 > 600Hz
Flat Low High
20kHz30 > 600Hz
O/M ST 4.075 25/06/02 18:35 Page 7
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