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7
ADJUSTING THE SYSTEM
Once the system is operational, the first thing to do, is set all crossover points
to approximate settings. In the case of the basic subwoofer system, set the
Low Pass filter crossover at 100 Hz or so. Set the Bass Boost equalizer control
to 0 dB.
Now you should set the amplifiers LEVEL adjustment. The knob accessible on
the front of the amplifier marked Input Level adjusts the input sensitivity
from150mV to 9 Volts.
To adjust the input sensitivity, turn the control using a small flat head
screwdriver fully counter clock wise to the minimum position. Do not apply
any pressure while turning as this might break the control unit. Adjust your
radio volume level to maximum marking and until audible distortion occurs.
When you begin to hear any distortion in the sound, back down a notch and
your amp is set. If no audible distortion occurs, begin to raise the amplifier
gain until there is distortion and then turn it down a notch. It is helpful to
have a second person to help you set the gain. When setting up a multi-amp
system, set each amplifier gain separately. Start off with the bass amplifier,
then adjust the highs amplifier level control to match.
The level control of any car amplifier should not be mistaken for a volume
control. It is a sophisticated device designed to match the output level of
your source unit to the input level of the amplifier. Do not adjust the
amplifier gain to maximum unless your input level requires it.
If your unit has been professionally installed please do not change the gain
settings set by the installer, he is the professional!
You system can also be extremely sensitive to noise when the LEVEL is set to
maximum and does not match your input signal. The gain adjustments need
to be made only once when first setting up the system.