User Guide

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CONTROLS AND INDICATORS

1 • RCA INPUT CONNECTORS: connect the pre-output leads of the head

unit to the input connectors.

2 • INPUT MODE SELECTOR: allows to select the amplifier’s

configuration as follows:

a) STEREO “ST” when the amplifier is used as a two-channel stereo

system (right + left);

b) MONO (L mono) when the amplifier is driven by one input signal “Left”

and outputs are mono-bridged.

NOTE: in this configuration, no signal is present at the “Right” pre-output

RCA output connection;

c) MIX “L+R”: when the amplifier is designed to drive one or more subwoofers according to the

1-, 2- or 3-channel configurations. Thus, the inputs signals will be blended into one signal.

NOTE: anyway, the signals present at the Pre-output outputs will always be stereo.

3 • INPUT GAIN ADJUSTMENT CONTROL: input sensitivity ranges from 200 mV to 2V.

Set the mid position for all MACROM units.

In case the amplifier is to be connected to a head unit that is not of MACROM make but is

fitted with preamplified RCA outputs, proceed as follows:

a) set the volume control of your head unit to 3/4 of maximum ouput

level;

b) set the input gain control to the point where the maximum sound

level with no distortion is obtained.

4 • LOW-PASS SELECTOR SWITCH: it allows to select the

amplifier’s output mode by activating the Low-Pass crossover.

a) Flat: the amplifier reproduces the whole range of frequencies from 20 Hz

to 20kHz

b) Low: the amplifier reproduces low frequencies only.

5 • LOW-PASS FREQUENCY ADJUSTMENT: allows the continuous

adjustment of the low-pass frequency between 30 and 600 Hz, to

determine the end point of the audio range present at the amplifier’s

outputs and at the Pre-output outputs should the low-pass filter be selected.

6 • HI-PASS FREQUENCY ADJUSTMENT: allows the continuous adjustment of the high-pass

frequency between 30 and 600 Hz, to determine the starting

value of the audio range present at the Pre-Output outputs.

7 • PRE-OUTPUT SELECTOR SWITCH: allows to select the

Pre-output output mode as follows:

a) FLAT: a signal having the same form and amplitude as the

input signal is present at the Pre-output outputs;

b) LOW: a low-pass signal is present at the Pre-output outputs

in order to drive an additional amplifier. Frequencies can be

adjusted by means of the LOW-PASS FREQUENCY “5”

control;

c) HIGH: a high-pass signal is present at the Pre-output outputs in order to drive an additional

amplifier. Frequencies can be adjusted by means of the HIGH-PASS FREQUENCY “6” control.

600Hz30Hz

150Hz

33Hz

36Hz

45Hz

70Hz

100Hz 250Hz

340Hz

470Hz

520Hz

580Hz

Flat Low

20Hz 20kHz

20Hz 30>600Hz

L(mono) ST L+R

20Hz 20kHz

20Hz 30>600Hz

Flat Low High

30>600Hz 20kHz

O/M 42.29 26/06/02 10:19 Page 7