Controls And Indicators - Macrom Syn Tech 4.075 Owner's Manual

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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.