Setting The Gain - Profile California AP400 Installation Instructions & Owner's Manual

U
SING THE BASS REMOTE, SUBSONIC FILTER, AND PHASE
Mounting and using the bass level remote control.
POWER
MIN MAX
Using the Subsonic Filter.
Subsonic
30
20 50
Using the Phase Control.
Phase
180
0
Fine tune the amplifier's input sensitivity.
By rotating the control in the clockwise direction, the amplifier's input will become more
sensitive and the music will play louder. 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
radio volume control.
To properly set the gain, start by setting the gain to its minimum position and turn the
main radio volume up to 3/4 of maximum volume control. Then slowly raise the amp gain
control until the system gets loud but before the point of distortion. It is very important
when making these adjustments that you do not over drive the speakers that may be
permanently damaged. The gain control should be adjusted very slowly. It may help to
have another person assist you by adjusting the gain control while you listen for distortion.
Models AP1200, AP2000, AP700M,and AP1000M are equipped with a
wired bass level remote control. Using the 16.4' wire provided, the
remote control should be mounted under dash in front of the car
where it can be accessed easily. Rotating the knob in the clockwise
direction will remotely increase the bass level.
Models AP2000, AP700M, and AP1000M are equipped with a variable
20~50Hz subsonic filter. This filter avoids the reproduction of
inaudible low frequencies on the amplifier which could damage the
subwoofers because they can generate over-displacement of the
subwoofer cone. You would want to set the frequency point where
you want the filter not to produce frequencies below that point.
Generally, human ears cannot hear low frequencies below 20 Hz.
Two mono subwoofer amplifier models, AP700M & AP1000M, are
equipped with a continuously adjustable phase lag control on
subwoofer(s) from 0 to 180 degrees. This control helps to align
the phase shift of a subwoofer for a smooth blending, without
canceling the bass from other speakers or subwoofer(s).
S
ETTING THE GAIN
The gain control has been included to allow adjustment to properly
match the signal output of the radio. This is one of the most
misunderstood adjustments. 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.
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