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ENGLISH
MGA AMPLIFIERS
GAIN
Fine tune the amplifier's input sensitivity.
The gain sensitivity control for the “MGA”
amplifier is located on the side panel. This gain control
has been included to allow adjustment to properly
match the output of the radio. This is one of the most
misunderstood adjustments. By rotating the control in
the clockwise direction, the amplifier‘s input will
become more sensitive and the music will play louder. This is
not a volume control and you will not get more power out of the amplifier in the maximum
position! It may seem to deliver more output, but actually the system is only playing louder
faster as you turn the volume control on the radio. Ideally, to properly level match the
system the goal is to achieve maximum output from the amplifier without distortion at
about 3/4 of the volume control.
To determine if the amplifier’s gain is set properly, turn the system on and slowly increase
the volume control. You should be able to use about 3/4 volume before the system gets loud
but not distorting. It is very important when making these adjustments that you do not
over drive the speakers (at point of distortion) this will cause permanent damage to the
speakers. If you are unable to achieve 3/4 volume before distortion you will need to
adjust gain control (in this case you would reduce the gain). The gain controls should be
adjusted very slowly. It may help to have another person to assist you by adjusting the
gain controls while you listen for distortion.
FINE TUNE THE SYSTEM
Select the crossover type for the
front speakers
Select the crossover type for the
rear speakers
Select the crossover
point for your front speakers.
Select the crossover
point for your rear speakers.
X-over Frequency Multiplier
Out = X1 (55Hz - 600Hz)
In = X10 (550Hz - 6Khz)
Select the source input
2 CH. BASS = 2 channel input with bass boost on front and rear channels
2 CH = 2 channel input with bass boost on the front channel
4 CH = 4 channel input with bass boost on front channels only
Select the operation mode for the
front and rear channels
ADJUSTING THE X-OVER AND BASS
You can add up to 16dB of bass boost
by adjusting the Bass Boost control.
0
16
dB
FREQ Hz
55
55
110
110
600
600
330
330
240
240
X 10
X 1
FREQ RANGE
FREQ Hz
POWER
FRONT
FRONT
L+R MONO
L+R MONO
STEREO
STEREO
BRIDGED (F R IN)
BRIDGED (F L IN)
REAR
REAR
4 CH.
2 CH.
HIGH
FULL
LOW
HIGH
SOURCE
2 CH. BASS
FULL
LOW
BASS
BOOST