The following is a basic formula to be used as a guide to determine current draw. A50% amplifier efficiency rating is used as an average. Your new PCXamplifier is more efficient than most other amplifiers. This formula is to be used as a guideline. Using wire of a larger gauge can only improve the current transfer of your system. Do not use smaller gauge wire.

Total RMS output x 2 = Total Input Wattage

Total Input Wattage = Current Draw (in Amps)

Supply Voltage

Example: A POWERCLASS™ PCX 1500 amplifier has two channels at 200w per channel RMS rating into 4 Ohms (500 x 1 = 500).

You would use the formula in the following way:

500W x 1 = 500W

500W = 41.6 Amps Total current draw.

12V

If the same amplifier is driven into a 2 Ohm mono load, double it's 4 Ohm RMS rating. All POWERCLASS™ amplifiers will effectively double their power at this load.

500W x 1 x 2 = 1000W

1000W = 83.3 Amps Total current draw.

12V

If you are using more than one amplifier, add up the total current draw for all of them and choose the appropriate gauge based on the grand total.

Recommended Minimum Gauge

Your New! PCX™ amplifier has a TC-XCrossover (Total Control X-over©) (See page 19 for crossover Detent Chart). 12dB per octave phase correlated crossover built in to provide superior system flexibility without the added expense and installation of an outboard crossover. The speaker outputs of your amplifier are high-pass, low-pass, or all-pass according to the HP/LP/Full switch on the front endplate. You would choose low pass (switch middle) to use this amp for sub- woofers, choose high pass (switch left), or full (switch right) to use this amp for full range speakers.

The RCAoutputs are controlled by a separate HP/LP/Full switch, and are always independent of the speaker output crossover. As well as being able to independently select HP/LP/Full, your new PCX™ amplifier allows independent selection of frequencies from 30-4kHz (See page 19).

NOTE: The System Diagrams beginning on page 18 show several ways to use the virtually unlimited PCX™ amplifiers internal crossovers in your system.

PCX 1250

Front - 12dB/Octave, Detented; HP/LP/Full; 30-4kHz

Rear - 12dB/Octave, Detented; HP/LP/Full; 30-4kHz;

Subsonic - 12dB/Octave, Detented; High Pass; 5-80Hz

QBASS - on Front Channel - up to 12db boost @ 40Hz.

PCX 1500

Front - 12dB/Octave, Detented HP/LP/Full; 30-4kHz

Output - 12dB/Octave, Detented; HP/LP/Full; 30-4kHz

Total Current Draw

(in amps) Up to 4ft. 4 to 7ft.

Length Of Wire To Be Run

7 to 10ft. 10 to 13ft. 13 to 16ft. 16 to 19ft. 19 to 22ft. 22 to 28ft.

Subsonic - 12dB/Octave Detented; High Pass; 5-80Hz

50-65

8

8

65-85

6

6

85-105

6

6

105-125

4

4

125-150

2

2

150-200

0

0

200-250

00

00

300-up

000

000

 

 

 

6

4

4

4

2

0

00

000

4

4

2

2

2

0

000

0000

4

2

2

2

0

00

000

0000

4

2

2

0

0

00

000

0000

4

2

2

0

0

00

000

0000

2

0

0

0

00

000

0000

00000

QBASS PLUS - on Front Channel - up to 18db boost @ 30, 36, 44, 60Hz.

NOTE: The ground wire should be the same gauge as the power wire.

15

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Precision Power PCX1250 manual Recommended Minimum Gauge

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.