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manual abstract
The APA4203 puts out 50 watts of continuous power into a 4-ohm load and delivers 75 watts (typical) into a 2-ohm load. The APA4162 is rated at 40 watts of continuous power or 65 watts (typical) for the same loads. Both models come 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/rear, LP (low-pass)/HP (high-pass) electronic crossovers each with a 12 dB per octave slope and full adjustment range (from 50 to 200 Hz) to aid in audio system design ♦ Variable bass extender circuit to reinforce low frequency signals that may be lost due to box design ♦ Non-fade summed-stereo outputs (on APA4203) for system expansion ♦ Ground loop isolation inputs with adjustable input level controls to accept a wide range of input signals (from 200 mV to 5 V) ♦ Remote turn-on with “soft-start” muting to prevent turn-on “thump” ♦ Regulated MOSFET power supply with low AM RFI and protection circuits for overheating and speaker shorts ♦ 2-ohm load capability to drive a variety of speaker systems ♦ Gold-plated input/output connectors and an external automotive-type fuse ♦ Aluminum heat sink for efficient dissipation of heat In order to start enjoying your new Clarion 4-channel car audio amplifier as soon as possible, please read the remaining pages to plan your installation. When you’re finished, fill out and send in the enclosed warranty card to protect your purchase and to aid us in any service-related questions. Also, save your original bill of sale as a proof of purchase. Introduction ♦ 3 Clarion А PA4203/А PA 4162 DESCRIPTION The Clarion APA4203 (or APA4162) 4-channel car audio amplifier is an ideal choice for creating a variety of multi-channel sound systems. Both models features built-in system design flexibility that allows you to create a 2-, 3-, or 4-channel amplifier with a flip of a switch. Or you can configure the front (CHI/2) or rear (CH3/4) amplifier sections for mixed-mode operation to drive a set of satellite speakers and a subwoofer. Figure 1. Clarion APA4203 4-channel car audio amplifier. The built-in 12 dB-per-octave electronic crossovers let you tailor the sound of front and rear channels. Other amplifiers may offer a single filter, but this unit comes with two independent filters with adjustable crossover frequencies for high-pass or low-pass filtering. And you don’t need to add external crossovers and cables, resulting in a cost-effective, efficient way to implement your design ideas. Either amplifier uses a regulated MOSFET power supply for superior control of output wattage, regardless of input voltage or musical energy content. MOSFETs are chosen for their inherent characteristics to provide superior accuracy, stability, and control. A toroid-coil transformer yields maximum power transfer with minimum heat loss. Careful attention to circuit design keeps AM RFI at low levels, so you won’t hear unwanted 4 ♦ Description OPERATION/INSTALLATION MANUAL noise when the level is cranked up. Protection circuits safeguard the amplifier when overheating and speaker shorts or improper load conditions occur. All connections and controls are on end panels and are straightforward and easy to understand. We use gold-plated RCA and barrier connectors to ensure the best electrical connection for your system. Included are external automotive-type fuses that are easy to replace. Amplifier Inputs/Controls/Power Indicator The APA4203’s (or APA4162’s) front panel (see Figure 2) has SPEAKER LINE INPUT connections, (RCA) INPUT jacks, a GAIN CHI/2 control, an INPUT MODE switch, a GAIN CH3/4 control, FILTER CHI/2 and CH3/4 controls (for setting crossover frequencies for LP or HP filters), a BASS EXTENDER gain control, and a POWER indicator. Figure 2. Front panel of a Clarion APA4203 or APA4162 amplifier. A reference chart (see detai which inputs are active for a selected mode. Low-level/Speaker-Level Inputs The gold-plated RCA INPUT jacks, labeled CH 1 through CH 4, provide connections for a low-level front/rear stereo source. In addition, SPEAKER LEVEL INPUT connections are provided for installations where the source unit’s RCA outputs are unavailable and direct connection to speaker outputs is the only choice (see Specifications on pages 22 and 23 for wire codes). Gain Controls The CHI/2 GAIN and CH3/4 GAIN controls allows you to independently set the nominal operating levels of the amplifier’s front and rear channels. The amplifier’s wide range, 200 mV to 5 V for RCA inputs or 400 mV to 10 V for speaker-level inputs, can accommodate input levels from virtually any brand of source unit. Description ♦ 5 Clarion APA4203/APA4162 DESCRIPTION Amplifier Inputs/Controls/Power Indicator (Continued) Channel Mode Switch The INPUT MODE switch allows you to select 4-, 3-, or 2-channel operation. A r...