Locate an area near the amplifier(s) that is metal and clean an area about the size of a quarter to bare metal. Inspect the area around and underneath to be sure you won't drill into wires, brake or fuel lines, etc. Drill a pilot hole in the middle of this area. Terminate the ground wire with a ring connector and attach it to the bare metal using a #8 sheet metal screw and washer or preferably, a bolt, nut and a star washer (not supplied). We suggest crimping and soldering this connection. After the connection is complete, coat the area (on both sides) with silicone or some similar material to prevent rust from developing on the bare metal. If your grand total current draw is over 50 amps (or total output power is over 300 watts), you should run a separate ground wire beside your power wire from the battery to the amplifier(s). Keep the ground and power wires as close together as possi- ble, and use the same gauge wire for both. This will ensure that you have a good ground path, and may eliminate such potential problems as engine noise and overheated amplifiers.

If your grand total current draw is over 100 amps (or total output power is over 600 watts), you are probably exceeding the capability of your charging system. Dimming lights and fluctuating voltage are solid indicators that you need to upgrade your alternator, battery, or both. Keep in mind that your amplifiers simply convert electrical energy to acoustical energy, and any electrical deficiency will compromise the performance of your sound system. For more information about charging system upgrades, see your local authorized PrecisionPower Dealer or call PrecisionPower Technical Support at 1-800-62POWER x 229.

The ability to run stereo speakers while simultaneously running a mono output from the same amplifier is accomplished by running the stereo speakers normally and tapping into the appropriate wires for the "mixed mono" channel (left channel positive for the positive speaker wire and right channel negative for the negative speaker wire). Speaker impedance should be no lower than 2 Ohms on the stereo channels and 4 ohms on the mono channel.

NOTE: Passive crossovers must be used for "mixed mono" operation. Choose a low pass crossover around 100Hz for your subwoofer, then choose a high pass crossover for your stereo channels. The high pass crossover must be at the same or slightly higher frequency than the low pass crossover to maintain the correct impedance. See your PrecisionPower dealer or call 1-800-62POWERfor more information about passive crossovers.

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Precision Power PCX 250, PCX 280 manual
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PCX 250, PCX 280 specifications

Precision Power is a renowned name in the audio industry, offering high-performance amplifiers that cater to both casual listeners and audiophiles. Two standout products in their lineup are the PCX 280 and PCX 250 amplifiers. Each model is designed to deliver exceptional sound quality, impressive power output, and innovative technologies that elevate the listening experience.

The PCX 280 is a powerhouse amplifier, capable of delivering up to 280 watts of peak power. This amplifier is designed to drive high-performance speakers and subwoofers, making it ideal for those seeking a dynamic audio experience. The PCX 280 features a Class D amplifier topology, which ensures high efficiency and low heat generation. This allows users to enjoy long listening sessions without the worry of overheating or distortion. Additionally, the PCX 280 incorporates a built-in crossover network, enabling precise frequency separation between different audio components for a clearer soundstage.

On the other hand, the PCX 250 is a slightly more compact but equally powerful option, with a peak output of 250 watts. This amplifier is perfect for smaller audio systems or casual listening environments, providing ample power without compromising sound quality. Like the PCX 280, the PCX 250 uses Class D technology, ensuring efficiency and minimal power loss. Its design also features a variable gain control, allowing users to fine-tune the output level to match their specific needs.

Both models showcase Precision Power's trademark quality and attention to detail. The robust construction of the PCX amplifiers includes a sturdy chassis designed to reduce vibrations and unwanted resonance, further enhancing audio clarity. The intuitive interface, complete with well-placed controls and LED indicators, allows users to easily adjust settings and monitor performance.

In terms of connectivity, both amplifiers offer versatile input options, including RCA and speaker-level inputs, making them compatible with various audio sources. These amplifiers also feature durable binding posts for speaker connections, ensuring a secure connection that maximizes sound transmission.

In summary, the Precision Power PCX 280 and PCX 250 amplifiers are exceptional choices for anyone seeking superior audio performance. With their advanced Class D technology, solid construction, and user-friendly features, both models provide powerful and clear sound, making them ideal companions for music enthusiasts and audiophiles alike. Whether you opt for the powerhouse PCX 280 or the compact yet capable PCX 250, you can trust that you're investing in quality audio equipment designed to enhance your listening experience.
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