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Located on the Input Panel, the objective of GAIN adjustment is to match the output of the
source unit with the input of the amplifi er. The output voltage of individual source units can
vary. Some source units have an output of 200mV and others have 5 volts or more. To cater
to these variations, the amplifi er has an adjustable gain control that ranges from 100mV to 5
volts. Follow the steps below to set gains.
Besides better sonic reproduction, proper input GAIN also helps to prolong the reliability span
of your amplifi er by eliminating excessive internal temperature generated by incompatible
source unit output and amplifi er input.
Note: Turning the input gain up does not indicate more power. Just more noise. The input gain
control is not a power control.
If the Remote Gain is used, connect the plug of the Remote Gain to the port on the panel of
the amplifi er.
1. Turn the input GAIN all the way down (counter-clockwise).
2. Set the volume control of the source unit to approximately 3/4 of its maximum output.
3. Turn the balance control of the source unit to its center position (fl at).
4. Leave the tone (bass/treble) controls at their usual position (fl at).
5. Play a CD or tape track with great dynamic range.
6. Use the Bass Boost Control on the amp to enhance the bass performance (if desired),
not the bass on the headunit. Use this control sparingly.
7. To locate the optimum gain setting, ask the person assisting you to turn the input GAIN
control clockwise until audio distortion starts to develop. Turn the gain control back
wards slightly to minimize the distortion.
8. If you constantly switch between CD/tape and radio, you will need further adjustment
since radio output level differs from that of CD or tape. In this case, you need to locate
a balanced gain setting which is best for both the output level of radio and the
CD/tape.
SYSTEM TUNING (INPUT GAIN ADJUSTMENT)
Note: If you are using the Remote Gain, make sure to take this into account during setup
procedures of the subwoofer amplifi er. You should set the system up with the Remote Gain
plugged in, and with the level knob turned all the way down (counter-clockwise).
CROSSOVER FREQUENCY SELECTION (FREQ)
The built-in low-pass crossover offers continuously adjustable crossover frequencies between
40Hz and 200Hz. Adjust the setting according to your speaker component specifi cation or to
your particular preference.
BASS BOOST CONTROL (BASS BOOST)
Select a boost level between 0dB and +18dB @ 40Hz to enhance the bass performance for
your sound system. BASS BOOST is NOT free! Every 3dB of boost costs you twice as much in
power. Make sure to set the fi nal gains after setting the Bass Boost to work best with your
subwoofer/enclosure combination. More is NOT always better!
SUBSONIC FILTER (SUB SONIC)
The fi xed 30Hz sub sonic fi lter can be set on/off. When enabled, the integrated sub sonic fi lter
creates cleaner and tighter bass reproduction by protecting the power amp and speaker from
harmful ultra-low frequencies. We recommend enabling this item at all times.
SYSTEM TUNING (CROSSOVER ADJUSTMENT)