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Clarion APX280M - page 1
APX280M manual.qxd 3/12/2004 12:55 PM Page 1 ...
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Clarion APX280M - page 2
APX280M Power System Amplifier INTRODUCTION The Clarion APX280M is a full-featured two-channel amplifier incorporating the following features: • S pecially 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 wit ...
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Clarion APX280M - page 3
Operation/Installation Manual 1 DESCRIPTION The APX280M uses an unregulated MOSFET power supply for superior sound and output wattage. In addition, a toroid-coil is used to transfer power with min- imal performance loss due to heat. T o avoid unwanted noise, a double-sided conformal printed circuit board with strategically placed components keep s ...
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Clarion APX280M - page 4
APX280M Power System Amplifier 2 • Gain Control - This allows you to set the nominal operating level of the amplifier . The amplifier's range, 250mV to 2.5V for RCA inputs or 500mV to 5V for speaker level inputs, can accommodate input levels from virtually any brand of source unit. • Bass Boost Contro l- The amplifier also features a " ...
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Clarion APX280M - page 5
Operation/Installation Manual 3 CONNECTIONS FOR POWER AND SPEAKERS The rear panel of the APX280M contains power and speaker connections as shown below . Figure 2 1. Left S peaker Output 2. Right S peaker Output 3. Remote T urn-on Input 4. Ground Input 5. Battery + 12V Input 6. 25 Amp Fuse Figure 3 APX280M manual.qxd 3/12/2004 12:55 PM Page 3 ...
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Clarion APX280M - page 6
APX280M Power System Amplifier 4 INST ALLA TION This section suggests Mounting and Wiring Precautions for inst alling the Clarion APX280M amplifier . If you do not posses the necessary tools and installation experi- ence, do not attempt to install this amplifier . Instead, contact your local Clarion deal- er to perform the installation. MOUNTING PR ...
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Clarion APX280M - page 7
Operation/Installation Manual 5 7. When creating passage holes for power cables, RCA's cords, and speaker wires, use grommets to eliminate any sharp edges created during drilling. This will protect the wire from being nicked and causing a short circuit. 8. Extra cable can cause signal loss and act as an "antenna" for noise. Use only ...
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Clarion APX280M - page 8
APX280M Power System Amplifier 6 2-Channel Full-Range, Satellite, or Subwoofer Stereo System (Set INPUT SELECT Switch to STEREO) Figure 5 In this application, the amplifier is used in stereo and drives two full-range (or satellite or subwoofer) speakers. NOTE: A passive crossover must be used with satellite speakers. Set X-Over Mode as shown. Set X ...
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Clarion APX280M - page 9
Operation/Installation Manual 7 Mixed-Mode Satellite and Subwoofer System (Set INPUT SELECT Switch to STEREO) Subwoofer 4 Ohms Figure 6 The amplifier can be configured for a mixed-mode operation. The t able provides component values to create a 6dB per octave crossover at specified frequencies. Use components that have a + 5% tolerance and cap acit ...
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Clarion APX280M - page 10
APX280M Power System Amplifier 8 SETTING THE GAIN After completing the inst allation, follow these steps to set the Gain Control and then perform the Final System Checks. 1. T urn the Gain Control all the way counter-clockwise. 2. T urn the vessel's Ignition Switch to the ON position. Then turn the ON/OFF Switch on the source units to the ON p ...
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Clarion APX280M - page 11
Operation/Installation Manual 9 FINAL SYSTEM CHECK 1. S tart the engine and turn on the source unit. After a two-second delay , slowly increase the V olume Control and listen to the audio. If you hear any noise, static, distortion or no sound at all, check the connections, and also refer to T roubleshooting. Depending on your system design, the lev ...
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Clarion APX280M - page 12
APX280M Power System Amplifier 10 Problem Distorted audio. Solution Gain is not set properly , or damaged speaker cones. Review Setting Gain; inspect each speaker cone for signs of damage (i.e. frozen cone, burning smell, etc.) Problem Audio lacks punch. Solution S peakers wired incorrectly , which causes cancellation of bass frequencies. Check pol ...
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Clarion APX280M - page 13
Operation/Installation Manual 11 CLARION LIMITED W ARRANTY For USA and Canada only If purchased from an authorized Clarion dealer , this product is warranted against all defects in materials and workmanship for a period of one (1) year from the date of original purchase. Clarion ProAudio prod- ucts, except for speakers, are covered by a two (2) yea ...
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Clarion APX280M - page 14
APX280M manual.qxd 3/12/2004 12:55 PM Page 12 ...
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