4 Channel Power System Amplifier

The Input Connections are gold-plated RCA Jacks and are labeled as FRONT RIGHT, FRONT LEFT, REAR RIGHT and REAR LEFT. The Gain Controls provide a wide adjustment range to accommodate output levels from any brand of source unit.

•Gain Controls - Seperate Front and Rear Gain Controls allow 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 undesired, set Bass Boost to 0dB.

High-pass/Low-pass Filter Controls

•Freq (Hz) Controls - The front crossover frequency is fully adjustable between 55Hz and 550Hz. The rear crossover frequency is fully adjustable between 55Hz and 5500Hz (via the Rear Crossover Frequency Multiplier) for a wider range of crossover points. Use this feature, along with your speaker manufacturer’s recommended crossover frequencies, to quickly design a more advanced system. NOTE: If either of the X-Over Mode Switches is set to OFF, varying the Freq (Hz) Control will produce no effect.

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

•X-Over Mode Switches - These switches are equipped with 12dB per octave electronic filters for precise frequency attenuation with minimal phase distortion. Each filter is activated by sliding the X-Over Mode Switch to either LP or HP.

•Output Mode Switches - These switches allow you to set the output mode for front and rear channels. Stereo output allows full left and right stereo oper- ation. Bridged Mode uses a single input (Right In) to produce a bridged output that is useful in high powered systems. L + R (sum mono) allows a stereo input to be summed into a mono output.

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Clarion APX401.4 installation manual High-pass/Low-pass Filter Controls
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APX401.4 specifications

The Clarion APX401.4 is an excellent addition to any audio enthusiast’s collection, designed to deliver superior sound quality and performance in a compact format. This four-channel amplifier is engineered to enhance your car audio system with crystal clear sound and powerful output, making it a popular choice among novice and seasoned users alike.

One of the standout features of the APX401.4 is its robust power output. It is capable of delivering 50 watts RMS per channel at 4 ohms, with the potential to drive up to 100 watts RMS per channel at 2 ohms. This flexibility allows users to connect a variety of speakers and subwoofers to suit their audio preferences, whether they are looking for deep bass or crisp highs.

The amplifier utilizes a Class AB design, which is well-known for its efficiency and sound quality. This design offers the best of both worlds—providing high levels of power while minimizing distortion. The result is a clean and rich audio experience, making it ideal for those who appreciate detailed sound reproduction across a range of frequencies.

Additionally, the APX401.4 incorporates advanced technologies such as a high-level input feature, allowing for direct connection to factory-installed head units that do not have preamp outputs. This makes it accessible for installation in various vehicles without the need for significant upgrades to the existing audio system.

The amplifier also comes equipped with an adjustable low-pass filter and a high-pass filter. This feature enables users to tailor the crossover frequencies to achieve a more precise sound profile based on their specific speakers and listening preferences. Whether you want to eliminate unwanted distortion from higher frequencies or enhance bass response, this amplifier provides the necessary tools to fine-tune your audio output.

For those concerned with durability and longevity, the Clarion APX401.4 is built with high-quality components and a robust chassis design that can withstand the rigors of automotive environments. Its compact size allows for easy installation in a variety of spaces within the vehicle.

In summary, the Clarion APX401.4 is a powerful, efficient, and flexible four-channel amplifier that enhances any car audio setup. With its impressive power capabilities, advanced technology, and user-friendly features, it’s an outstanding choice for anyone looking to elevate their in-car listening experience.
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