Clarion APX280M manual High-pass/Low-pass Filter Controls

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APX280M manual.qxd 3/12/2004 12:55 PM Page 2

APX280M Power System Amplifier

•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 Control- The amplifier also features a "high-Q" (i.e. narrow frequency band) Bass Boost circuit. It acts much like an equalizer, with adjustable gain (from 0 to +18dB) 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 car audio environment. NOTE: If Bass Boost is undesirable, set Bass Boost to 0dB.

High-pass/Low-pass Filter Controls

•Frequency (Hz) Selection Control - The crossover frequency is fully adjustable between 55Hz and 5500Hz (via the Crossover Frequency Multiplier) for a wide range of crossover points. Use this feature, along with your speaker manufacturer's recommended crossover frequencies, to quickly design a more advanced system (see Applications on page 6) NOTE: If the X-Over Mode Switch is set to OFF, varying the Freq (Hz) Control will produce no effect.

•Crossover Frequency Multiplier Switch - When engaged, this switch increases the crossover frequency by a factor of 10. Example: If the Freq (Hz) dial is set for 240 Hz, pushing in the Multiplier Switch changes the setting to 2400 Hz.

•X-Over Mode Switch - This switch is equipped with a 12dB per octave electronic filter for precise frequency attenuation with minimal phase distortion. The steep crossover slope keeps midrange tones out of the subwoofer and thereby eliminates an unnatural "nasal" tone quality in the audio system. A filter is activated by sliding the X-Over Mode Switch to either LP or HP.

•Input Mode Switch - This switch allows you to set the input mode. Stereo input allows full left and right stereo operation. Right (bridged) input allows

single channel input for bridged operation. This is especially useful in high-powered systems when using one amplifier for each subwoofer/speaker. L + R

(sum mono) allows a stereo input to be summed into a mono output.

•Speaker Level Inputs - These provide connections for a high-level stereo source. In addition, these connections are provided for installations where the source unit's RCA outputs are unavailable.

WARNING: When using the speaker (high-level) inputs, the Black wire must be grounded at the Radio. Failure to do this will result in noise and improper operation.

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Contents APX280M manual.qxd 3/12/2004 1255 PM Table of Contents About the Manual and WarrantyIntroduction Description Input Connections and Audio ControlsHigh-pass/Low-pass Filter Controls Connections for Power and Speakers Mounting Precautions InstallationWiring Precautions Wiring and Applications Bridged Mono Subwoofer SystemSet Input Select Switch to Stereo Channel Full-Range, Satellite, or Subwoofer Stereo SystemMixed-Mode Satellite and Subwoofer System Setting the Crossover Setting the GainSetting the Bass Boost Troubleshooting Final System CheckProduct Specs THDClarion Limited Warranty APX280M manual.qxd 3/12/2004 1255 PM

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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