Clarion APA4203 Operation & Installation Manual page 6

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APA4203/APA4I62
DESCRIPTION
Amplifier Inputs/Controls/Power Indicator
(Continued)
Channel Mode Switch
The INPUT MODE switch allows you to select 4-, 3-, or 2-channel
operation. A reference chart above the switch (see Figure 2 on the previous
page) indicates which channel inputs, gain controls, and fdters are active for
your selection.
High-Pass/Low-Pass Filter Controls
The APA4203 (or APA4162) is equipped with 12 dB per octave electronic
filters on front and rear channels for precise frequency attenuation with
minimal phase distortion. The steep crossover slope keeps midrange tones
out of the subwoofer and thereby eliminates an unnatural "nasal" tone
quality in the audio system. A filter is activated by sliding the CHI/2 or
CH3/4 FILTER switch to either HP or LP. Each one is fully adjustable
between 50 and 200 Hz (via the CHI/2 FREQ or CH3/4 control) for a wide
range of crossover points. Use this feature, along with your speaker
manufacturer's recommended crossover frequencies, to quickly design a
more advanced system (see Applications starting on page 8).
NOTE: If CUl/2 FILTER (or CH3/4 FILTER) is set to OFF, varying the
CHI/2 FREQ (or CH3/4 FREQ) control will produce no effect.
Bass Extender Control
The APA4203 (or APA4162) also features a "high-Q" (i.e., narrow frequency
band) BASS EXTENDER circuit on channels 3 and 4 for 4- or 3-channel
modes and is also active for mono connections. It acts much like an equalizer,
with adjustable gain (from 0 to +12 dB) fixed at 40 Hz. Use this feature to
tune low-frequency audio response to compensate for a less-than-ideal
subwoofer enclosure design. The added boost produces rich, full bass tones
that are normally difficult to reproduce in the car audio environment.
NOTE: If bass extension is undesired, set BASS EXTENDER to 0 dB.
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Description