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APX290M/APX490M Power System Amplifier
3
English
1. CH1/CH2 RCA Input
2. Gain Control
3. Bass Boost
4. CH1/CH2 Frequency (Hz)
5. Frequency Range Multiplier
6. Crossover Mode
7. Output Mode Selector Switch
8. High Input
9. Power Light Indicator
8
1 2 3 4 5 6 7 9
The RCA connections are gold plated for optimum performance and low signal loss.
The RCA connectors are labeled CH 1 (front left), CH 2 (front right) [for APX490M:
CH 3 (rear left), and CH 4 (rear right)]. In applications where RCA signals are not
present, the speaker level output from the head unit can be used. (Use one or the
other input, not both.)
• Gain Controls: For the APX490M, separate CH 1/2 and CH 3/4 gain controls
allow you to set the nominal operating level of the amplifier. The amplifier's input
range, 200mV to 6.0V for RCA inputs and 500mV to 13V for speaker level inputs,
can accommodate input levels from virtually any head unit.
• Bass Boost: The amplifier features a "high-Q" (i.e. narrow frequency band)
Bass Boost circuit. It acts much like an equalizer with an adjustable gain from 0 to
+15dB fixed at 45Hz. 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 marine
audio environment.
NOTE: Bass Boost setting should only be used for subwoofer applications.
• Source Select (APX490M only)
2 CH BASS:
Uses CH 1/2 inputs and has output from all 4 channels with Bass
Boost.
2 CH:
Uses CH 1/2 inputs and has output from all 4 channels. The Bass Boost
will work only on CH 1/2 and have no effect on CH 3/4.
4 CH:
Uses all 4 channel inputs and has output from all 4 channels. The Bass
Boost will work only on CH 1/2 and have no effect on CH 3/4.
APX290M
APX280M APX490M manual.qxd 2/6/2008 11:38 AM Page 4