after the amplifier and separates the signal fed to each speaker in the system. Active crossovers offer the accuracy and flexibility needed for a sophisticated system and are used in complex multiple amp designs. Passive crossovers (capacitors and inductors) allow the use of mul- tiple speakers in a simple system which can easily be expanded over time. We recommend using a 6dB per octave, 100Hz low-pass crossover for the Punch Power Woofers when used with a passive system.

To customize the installation, try adjusting the crossover point one octave up or down to optimize the system staging.

C A L C U L AT I N G L O A D I M P E D A N C E

The Punch Power Woofers are used for the sub-bass region, those frequencies below 100Hz. This is the foundation for the music and the frequency range you feel. Before selecting the passive crossover it is necessary to calculate the load impedance of the speaker system. In a series circuit the impedance is determined by the formula:

Rt = R1 + R2 + R3 + etc.

In a parallel circuit the impedance is determined by the formula:

 

 

1

=

1

+

1

+

1

+

1

+ etc.

 

 

 

 

 

 

Rt

 

 

R3

 

 

 

 

 

R1

R2

 

R4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Where Rt is the total speaker load and R1, R2, etc. represent each speaker in the system.

The crossover is connected in line to the positive terminal of the speaker system. The crossovers are available from Authorized Rock- ford Fosgate Dealers.

3

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Rockford Fosgate PWR-410, PWR-815, PWR-812, PWR-810, PWR-412, PWR-415 owner manual L C U L AT I N G L O a D I M P E D a N C E
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PWR-415, PWR-412, PWR-810, PWR-812, PWR-815 specifications

Rockford Fosgate has long been a trusted name in the audio industry, and their PWR series amplifiers are designed to deliver superior sound performance, driving the best experience for audio enthusiasts. The PWR-812, PWR-815, PWR-412, PWR-415, and PWR-410 models cater to different requirements, offering a variety of power ratings and features suitable for various applications.

The PWR-812 is an 800-watt, 2-channel amplifier that operates at a power rating of 200 watts RMS at 4 ohms and 400 watts RMS at 2 ohms. With its Class D circuitry, it provides maximum efficiency while minimizing heat generation. The amplifier is equipped with adjustable crossovers, allowing users to tailor their sound settings according to their preferences. Its MOSFET power supply ensures robust performance and durability.

Moving on to the PWR-815, this model is a powerhouse, delivering 1500 watts across 2 channels. It is ideal for users looking to achieve higher volume levels without sacrificing clarity or detail. It features an impressive dynamic range, enabling it to reproduce the most demanding audio tracks with precision. The PWR-815 also leverages advanced thermal management features, which ensure reliable operation even under the most strenuous conditions.

The PWR-412 and PWR-415 models provide a balanced approach to power and control. The PWR-412, a 4-channel amplifier rated at 50 watts RMS per channel, is perfect for driving multiple speaker configurations. It supports extensive connectivity options, enabling seamless integration into existing audio systems. On the other hand, the PWR-415 elevates performance with its impressive 75 watts RMS per channel output, designed for those seeking a more robust sonic experience.

Finally, the PWR-410 amplifier is a 4-channel model that offers flexibility with its power output of 75 watts per channel at 4 ohms. It provides advanced features such as fan-cooled heat sinks for efficient thermal management and variable low-pass filters, allowing for fine-tuning of the audio signal.

All the amplifiers in the PWR series incorporate premium components and cutting-edge technologies, ensuring they meet the high standards that Rockford Fosgate is known for. With their robust build quality and thoughtful design, these amplifiers are well-suited for both casual listeners and serious audiophiles alike, making them a perfect choice for enhancing any car audio system.
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