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APX280M Power System Amplifier
INTRODUCTION
The Clarion APX280M is a full-featured two-channel amplifier incorporating
the following features:
• Specially coated circuit boards, that resist mold, mildew and moisture damage.
• Pulse-Width Modulated (PWM) MOSFET power supply for maximum
performance with minimal distortion.
• Remote turn-on with "soft start" muting to prevent turn-on "thump".
• Advanced circuitry design featuring bridgeable and mixed mode operation for
use in various system configurations.
• Variable high-pass/low-pass electronic crossover with a 12dB per octave slope
(adjustable range: 55Hz to 5.5kHz).
• Variable bass boost circuit to reinforce low frequency signals that may be lost
due to subwoofer enclosure design.
• Adjustable input level controls with ground loop isolation to minimize noise
and distortion.
• 2-ohm stereo stable, 4-ohm mono stable.
• Gold-plated power, speaker, and RCA connectors.
• Speaker level input.
• Low profile construction with aluminum heat sink for efficient heat dissipation.
ABOUT THE MANUAL AND WARRANTY
This manual describes the basic requirements to install the Clarion APX280M
amplifier. The installation of this amplifier can be quite complex to install, if you
do not posses the necessary knowledge and tools to perform this installation,
please contact your local Clarion dealer.
Keep all instructions and sales receipt for future reference and warranty infor-
mation. Warranty information can be found on page 11 of this manual.
TABLE OF CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Input Connections and Audio Controls . . . . . . . . . . . . . . . . . . . . . . . . . 1
Connections for Power and Speakers . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mounting Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wiring Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wiring and Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Setting the Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the Crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the Bass Boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Final System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Product Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Clarion Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
APX280M manual.qxd 3/12/2004 12:55 PM Page 2