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.

There are two sets of RCA jacks on the front end of your amplifier. The RCA cables from your source unit go in the set labeled INPUTS. If your source unit doesn't have RCA outputs don't worry. Simply add a set of RCAplugs (available at your dealer) to your front or rear set of speaker leads (see drawing below), plug them into the input jacks, and push to the IN position -12dBinput attenuation switch.

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 Advanced Instrumentation Input has trickled down from the $15,000 PrecisionPower 2500F1. This circuit completely isolates the chassis ground from the audio circuit of the amplifier and reduces noise radiated into your signal cables by up to 40dB. This is equivalent to a noise reduction of approximately one hundred times what the noise level would be without this circuitry. It provides all the benefits of a true 'balanced' line without the need of any special cables (see diagram below). This type of input works with any conventional RCAcable.

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Precision Power PCX1250 manual
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PCX1250 specifications

The Precision Power PCX1250 is an impressive monoblock amplifier designed for both car audio enthusiasts and professional sound installers. With its robust construction and state-of-the-art technology, it stands out in the competitive world of automotive audio equipment.

At the core of the PCX1250 is its powerful 1250-watt maximum output, providing ample power to drive even the most demanding subwoofers. The amplifier's class D topology ensures high efficiency, minimizing heat generation while maximizing audio performance. This means that users can enjoy loud, clear sound without worrying about overheating during extended use.

One of the standout features of the PCX1250 is its variable low-pass filter, which allows users to customize the sound to their preference. This filter plays a critical role in enhancing the bass response and ensuring that the subwoofer produces clean, undistorted low frequencies. The low-pass filter can be adjusted between 40Hz and 200Hz, giving users the flexibility to dial in the perfect setting for their specific system.

Convenience is another hallmark of the PCX1250. The amplifier is equipped with adjustable gain control, which lets users set the input sensitivity to match the output of their head unit or other source. This helps to prevent distortion and ensures that the audio maintains its clarity, even at higher volume levels.

Additionally, the PCX1250 features a built-in thermal protection circuit and a short-circuit protection system, which safeguard the amplifier from damage under adverse conditions. The power and ground terminals are designed for easy installation, with substantial gauge inputs that can handle high current levels without compromising performance.

In terms of design, the PCX1250 boasts a sleek and modern aesthetic, featuring a durable aluminum casing and stylish accents. Its compact size allows for flexible installation options, fitting comfortably in various vehicle layouts without sacrificing performance.

Overall, the Precision Power PCX1250 is an exemplary amplifier that combines power, performance, and versatility. With its robust features and cutting-edge technology, it is an excellent choice for anyone looking to elevate their car audio experience. Whether driving a single subwoofer or a full sound system, this amplifier delivers impressive sound quality, making it a top pick among audio aficionados.
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