User manual CLARION APA4203 INSTALLATION MANUAL

[. . . ] The Input Connections are gold-plated RCA Jacks and are labeled as FRONT Figure 1- 1. Rear X-Over Mode Switch 1 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. [. . . ] 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 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. The steep crossover slopes keep midrange tones out of the subwoofer and thereby eliminating an unnatural "nasal" tone quality in the audio system. Each filter is activated by sliding the X-Over Mode Switch to either LP or HP. · Input Mode Switches - These switches allow you to set the input mode for front and rear channels. Right (bridged) input allows single channel input for bridged operation. This is especially useful in high-powered systems when using the APA4203 as a bridged 2 channel amplifier. L + R (sum mono) allows a stereo input to be summed into a mono output. 2 · Rear Channel Input Select - This switch allows you to use a 2 channel input to drive all 4 channels of this amplifier. · Speaker Level Inputs - These provide connections for a high-level stereo source. When making connections, be sure that each connection is clean and secure. A secure clean ground connection is critical to the performance of your Clarion amplifier. Use the shortest ground wire possible and securely connect to the vessel battery to minimize resistance and avoid noise problems. Add an external fuse on the amplifier's positive (+) power lead and connect it as close as possible to the vessel's (+) battery terminal. Use a rating that equals the total current consumption at full output of all amplifiers in the system. Adding an external fuse will protect the electrical system from short circuits that can cause a fire. 9 6. Connect the amplifier's positive (+) lead via a fuse directly to the positive (+) terminal on the battery. Use redinsulated 10-gauge (or larger) wire for the amplifier's positive (+) power lead and the same-gauge black insulated wire for the ground. When replacing the amplifier 's fuse, always use one having the same current rating. Substituting a higher-rated fuse or a slow-blow type can result in serious damage to the amplifier. Make sure that your vehicle's electrical system (alternator, battery, etc. ) is capable of handling the additional load. [. . . ] Use only high-quality RCA cables that are no longer than necessary to make a direct connection with the source unit or equalizer. Figure 8 - Electrical connections for the APA4203 10 SETTING THE GAIN After completing the installation, follow these steps to set the Gain Control and then perform the Final System Checks. Set all Tone or Equalization Controls to "flat" positions and turn Loudness off. Note: If the system uses an equalizer, set its frequency controls to "flat" positions. SETTING THE CROSSOVER The Clarion APA4203 features fully adjustable front and rear crossovers. [. . . ]