APX280M manual.qxd 3/12/2004 12:55 PM Page 9

Operation/Installation Manual

FINAL SYSTEM CHECK

1.Start the engine and turn on the source unit. After a two-second delay, slowly increase the Volume 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 Troubleshooting. Depending on your system design, the levels may become quite loud even at low Volume Control settings. Until you get an "audio feel" of the system's power, use care when adjusting controls.

2.Turn the Balance Controls to their extreme positions and listen to the results. Audio imaging should match control settings (audio from the left speaker when balance is left).

3.Increase the volume and verify that the amplifier reproduces audio (at full frequencies) without distortion. If you hear distortion, check the connections and verify that the Gain Control is set correctly. Another possibility is damaged speakers or under-powered speakers. Once again refer to Troubleshooting for additional help.

TROUBLESHOOTING

Problem

No Audio.

Solution

Low or no remote turn-on voltage. Check remote connections at amplifier and source unit.

Blown amplifier fuse. Replace with new fast-blow fuse (same rating).

Power wires not connected. Check battery and ground wiring at amplifier; also check battery connections.

Speaker leads shorted. Check speaker continuity to ground, it should not show a common ground.

Speakers not connected or are blown. Check speaker connections at amplifier, measure coil impedance.

Problem

Audio cycles on and off.

Solution

Thermal protection circuits are shutting amplifier off. Check location for adequate ventilation; consult an authorized Clarion Audio Dealer.

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Clarion APX280M manual Final System Check, Troubleshooting
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APX280M specifications

The Clarion APX280M is an advanced marine amplifier designed for boating enthusiasts seeking high-quality audio performance on the water. Engineered to withstand the harsh marine environment, the APX280M combines cutting-edge technology with robust durability to deliver an exceptional sound experience.

One of the key features of the Clarion APX280M is its power output. With a peak power rating of 280 watts, the amplifier provides ample power to drive a range of marine speakers, ensuring that music can be enjoyed loud and clear, even in windy or noisy conditions. The amplifier is designed to deliver continuous power output of 70 watts per channel at 4 ohms, making it suitable for various setups and configurations.

The APX280M employs a Class D amplification technology, which enhances its efficiency and reduces heat generation. This technology not only maximizes the power output but also minimizes the draw on the boat’s battery, allowing users to enjoy prolonged use without worrying about power consumption. This makes the APX280M an energy-efficient choice for marine audio systems.

The amplifier features a compact, marine-grade aluminum chassis that is corrosion-resistant and designed to endure moisture and salt exposure. This rugged construction ensures longevity and reliability, making it an ideal choice for marine applications. It also includes a conformal-coated PCB that offers additional protection against the elements.

Another notable feature of the APX280M is its built-in crossover functions. This includes high-pass and low-pass filters, allowing users to customize their sound experience and optimize performance based on their speaker setup. The variable gain control allows fine-tuning of the output to match the specific needs of the audio system.

For users who seek simplicity, the amplifier is equipped with straightforward terminals for power, ground, and speaker connections, making installation easy and hassle-free. The low-noise design further enhances the listening experience by minimizing unwanted interference and distortion.

In summary, the Clarion APX280M is a powerful marine amplifier designed with features that address the demands of marine audio systems. Its combination of Class D technology, durability, and customization options make it an excellent choice for any boat owner looking to elevate their audio experience on the water. With the APX280M, users can enjoy quality sound while navigating the waves, making every outing more enjoyable.
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