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OPERATION/INSTALLATION MANUAL
gain for channel 5. The amplifier's wide range, 200 mV to 5 V for RCA
inputs or 400 mV to 10 V for speaker-level inputs, can accommodate input
levels from virtually any brand of source unit.
High-Pass/Low-Pass Filter Controls
The APA5241 is equipped with 12 dB-per-octave electronic filters for
precise frequency attenuation with minimal phase distortion. When
activated, the steep crossover slope keeps midrange tones out of the
subwoofer connected to channel 5 and thereby eliminates an unnatural
"nasal" tone quality in the audio system. The filters are activated by sliding
the FILTER switch to either 1LP for low-pass filtering on channel 5 or
4HP/1LP which adds high-pass filtering on channels 1 through 4.
Crossover points can be set at 80,120, or 180 Hz via the FILTER FREQ
switch. 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 FILTER is set to OFF, changing the FILTER FREQ switch will
produce no effect.
Bass Extender Control
The APA5241 also features a "low-Q" (i.e., wide frequency band) BASS
EXTENDER circuit on channel 5 and is active in all modes of operation. It
acts much like an equalizer, with adjustable gain (from 0 to +12 dB) fixed
at 45 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.
Channel Mode Switch
The CHANNEL mode switch allows you to select 3-, 4-, or 5-channel
operation, with the latter offering a choice of 4- or 2-channel inputs (on RCA
or SPEAKER LEVEL connections) without having to use external "Y"
adapters. A reference chart above the switch (see Figure 3 on the next page)
indicates how the channel inputs are configured for your selection.
Description ♦ 5
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