User manual CLARION APX400.4M

[. . . ] INTRODUCTION The Clarion APX400. 4M is a full-featured four-channel amplifier. It comes with the following features: · Full frequency response with low distortion and exceptional signal to noise performance · Advanced circuit design features bridgeable and mixed mode operation for use in a variety of 4, 3 or 2 channel systems · Independent front and rear, low-pass/high-pass electronic crossovers each with a 12dB per octave slope and full adjustment range (from 55Hz to 550Hz Front and 55Hz to 5. 5kHz Rear) to aid in audio system design · Variable bass boost circuit to reinforce low frequency signals that may be lost due to subwoofer box design · Adjustable input level controls with ground loop isolation accepting a wide range of input signals · Remote turn-on with "soft start" muting to prevent turn-on "thump" · Pulse-Width Modulated (PWM) MOSFET power supply with low AM RFI and protection circuits for overheating and speaker shorts · 2 ohm load capacity to drive a variety of speaker systems · Gold-plated input/output connectors and an external automotive type fuse · Aluminum heat sink for efficient heat dissipation · Low profile, compact size for space limited installations ABOUT THE MANUAL AND W ARRANTY To start enjoying your new Clarion four-channel amplifier, please read the instructions listed in this manual. Keep all instructions for future reference. Please fill out and send in the enclosed warranty card to protect your purchase and aid in warranty service. [. . . ] NOTE: Choose the same frequency for both LP and HP crossovers. Do not overlap frequencies, as this may damage the amplifier. 8 INSTALLATION This section lists Mounting and Wiring Precautions for installing the Clarion APX400. 4M. Combined with the experience of a professional installer, these safeguards provide enough detail to successfully complete an installation. If you do not have the necessary skills, do not install the amplifier yourself. Instead, see your authorized Clarion dealer for installation recommendations. MOUNTING PRECAUTIONS Although the Clarion APX400. 4M incorporates heat sinks and protection circuits, mounting the amplifier in a tight space without any air movement can still damage internal circuitry over time. Choose a site that provides adequate ventilation and is isolated from the marine environment. For easy system setup, mount the amplifier so the front panel controls will be accessible after installation. In addition, observe the following precautions: 1. For the most efficient cooling, mount the amplifier so cool air runs along the length of the fins rather than across them. Remember, any moving air will dissipate heat. Avoid mounting to subwoofer enclosures or areas prone to vibration. Prior to drilling, make sure proposed mounting holes will not cut into the fuel tank, fuel lines, brake lines (under chassis), or electrical wiring. WIRING PRECAUTIONS Read all wiring precautions. If you are not sure of the connections, contact your authorized Clarion dealer. Before installation, make sure the source unit Power switch is in the OFF position. Disconnect the negative (-) lead of the battery before making any power connections. When making connections, be sure that each connection is clean and secure. Insulate final connections with electrical tape or shrink tubing. Failure to do so may damage your equipment. 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. [. . . ] 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. Solution Low or no remote turn-on voltage. [. . . ]