MACROM 4450 ユーザーズマニュアル

1 • FRONT INPUT CONNECTORS: Connect the pre-output leads of the head unit to the input
connectors of the amplifier. This input will drive the end stage of the FRONT section.

2 • FRONT INPUT GAIN ADJUSTMENT CONTROL: input sensitivity ranges from 200 mV to
4V.
If the amplifier is to be connected to a head unit that is fitted with preamplified RCA outputs,
proceed as follows:
a) set the volume control of your unit to 3/4 of maximum output level;
b) set the input gain control to the point where the maximum sound level with no distortion is 

obtained.

3 • FRONT CROSSOVER SELECTOR: it allows to select the output
mode of the amplifier by activating either the High-Pass or the Low-Pass
filter.
a) Flat: the amplifier reproduces the whole range of frequencies from 

20 Hz to 20 kHz;

b) High-Pass: the amplifier reproduces a  range of frequencies from 

20 Hz to 30 Hz or from 20 Hz to 600 Hz as well as from 30 Hz to 
600 Hz;

c) Low-Pass: the amplifier reproduces a range of frequencies from 20 

Hz to 30 Hz or from 20 Hz to 600 Hz as well as from 30 Hz to 600 Hz.

4 • CONTINUOUS ADJUSTMENT OF THE FRONT HIGH-PASS AND LOW- PASS
FREQUENCIES: after positioning the filter, either High-Pass or Low-Pass, frequencies can be
adjusted between 30 and 600 Hz .

5 • 4CH/2CH INPUT MODE SELECTOR: it allows to select the amplifier’s input configuration
as follows:
a) “4ch”: the four input connectors have to be all connected to the pre-amplified outputs of 

the unit to drive the four amplifier channels;

b) “2ch”: to drive the four channels just the two Front input connectors have to be connected

to the pre-amplified outputs of the unit.

6 • 4CH/3CH/2CH OUTPUT MODE SELECTOR: it allows to select the amplifier’s output
configuration as follows:
a) ”4ch”: 4 output channels are working, therefore the amplifier configuration can be as 

follows: four stereo channels;

b) “3ch”: 3 output channels are working, therefore the amplifier configuration can be as 

follows: two stereo channels and one mono channel;

c) “2ch”: 2 output channels are working, therefore the amplifier configuration can be as 

follows: two mono channels.

7 • REAR CROSSOVER SELECTOR: it allows to select the output mode of the amplifier by
activating either the High-Pass or the Low-Pass filter.
a) Flat: the amplifier reproduces the whole range of frequencies from 

20 Hz to 20 kHz;

b) High-Pass: the amplifier reproduces a range of frequencies from 

20 Hz to 30 Hz or from 20 Hz to 600 Hz as well as from 30 Hz to 
600 Hz;

c) Low-Pass: the amplifier reproduces a range of frequencies from 

20 Hz to 30 Hz or from 20 Hz to 600 Hz as well as from 30 Hz to 
600 Hz.

2

O/M 44.50  26/06/02 9:48  Page 2