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POWER Amplifiers
Indicators and Controls
Power Indicator (POWER)
The power indicator provides a visual indication that the amplifier is turned on.
Input Level Control (LEVEL)
The input LEVEL control matches the output of your radio to the input of the
amplifier. After the installation is complete, make sure the input level control on
the amplifier is turned down all the way (counter-clockwise or all the way to the
left). Play a tape or CD (make sure bass and treble settings or Bass EQ are
flat) and turn the volume up slowly until you just start to hear distortion. Back
the volume down just a bit. On the amplifier, slowly turn up the input level
control (clockwise or to the right) until you just start to hear distortion, then
back it down a bit. Now your radio and amplifier levels are matched.
BASSEQ
The Bass EQ is continuously adjustable from 0 to +12dB@ 45Hz. Adjusting
the Bass Boost level allows different subwoofer/enclosure combinations to be
equalized. Use this control to increase the level of low bass available from your
subwoofer/enclosure combination. Ported and Band Pass enclosures should
be limited to about +6dB to +9dB of boost. Sealed enclosures should be able
to accept the full +12dB of boost, if necessary. The full +12dB of boost should
be reserved for special applications since improper use of the Bass Boost
could damage your subwoofers at high volumes.
Low Pass Filter (LPF)
The Low Pass Filter controls adjust the crossover point. Typical crossover is
between 60Hz and 80Hz for ported and sealed enclosures. Bandpass boxes
will typically use a higher crossover setting between 125Hz and 150Hz. Since
musical tastes vary, you should play music that you would normally listen to in
your vehicle, with the above settings as a starting point. If necessary, set the
crossover by ear.
High Pass Filter (HPF)
The high pass filter will limit the low frequencies being transmitted to your
speakers. This can be useful in number of situations. For example, if you
selected the high pass filter and set the crossover to 40Hz, then you would
have an infra-sonic (sub-sonic) filter at 40Hz, which would be useful with
certain enclosure/subwoofer combinations that were tuned between 45Hz and
50Hz. Other uses might include limiting the low frequencies to smaller
8
speakers (6 1/2", 6 X 9", etc.) by adjusting the crossover to a higher setting
(80-1 OOHz).
Phase Switch
The Phase Switch is selectable to 0 degrees (normal polarity) and 180
degrees (inverted polarity). Depending on the size and location of your
subwoofer and main speakers, you may need to adjust the Phase
Switch to provide the best blend in the midbass (60 - 150Hz).
To determine the appropriate phase setting, select either regular (0°)
or inverted (180°) and perform a sound test. Listen carefully to the
sound quality while playing a CD with male voices and/or low bass
such as percussion or bass lines, then select the position that
produces the fullest and most dynamic bass. You may need to adjust
the Input Level Control and the Low Pass Filter control after setting
the Phase Switch.
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