Rockford Fosgate P3D4-15 Subwoofer Review: Unleash Powerful, Deep Bass with This High-Performance Car Audio Upgrade

Rockford Fosgate P3D4-15 Subwoofer Review – Are you looking to upgrade your car’s audio system with a powerful subwoofer? Look no further! In this review, we’ll take an in-depth look at the Rockford Fosgate P3D4-15 subwoofer, discussing its features, specifications, performance, and more. By the end, you’ll have a clear idea of whether this subwoofer is the right choice for your audio needs.

Also read: Best 15-Inch Subwoofers

Features and Specifications

Rockford Fosgate P3D4-15 Subwoofer Review

Cone and Surround

The Rockford Fosgate P3D4-15 features a 15-inch, anodized aluminum cone that’s both lightweight and rigid, ensuring excellent sound reproduction. The cone is surrounded by a Santoprene rubber surround, which adds to its durability and helps to prevent distortion at high volume levels.

Voice Coils and Spider

This subwoofer comes with dual 4-ohm voice coils, providing flexibility for wiring configurations and amplifier compatibility. The voice coils are made from copper-clad aluminum, which reduces their weight while maintaining their ability to handle high power levels. The subwoofer’s spider is designed with a unique VAST (Vertical Attach Surround Technique), increasing the cone area and improving overall efficiency.

Magnet and Motor Assembly

The P3D4-15 features a powerful motor assembly that includes a double-stacked ferrite magnet. This design ensures the subwoofer can handle high power levels while maintaining precise control over the cone’s movement.

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Tinsel Leads and Terminals

Rockford Fosgate has used stitched tinsel leads to help reduce the risk of fatigue and failure, ensuring a longer lifespan for the subwoofer. The P3D4-15 also includes compression terminals, making it easy to secure your speaker wire connections.

Performance and Sound Quality

Low-Frequency Response

The P3D4-15 is designed to deliver deep, powerful bass, with a frequency response range of 22Hz to 250Hz. The subwoofer’s large cone area and extended excursion capabilities allow it to reproduce low-frequency sounds with accuracy and authority.

Power Handling and Efficiency

With a peak power handling of 1200 watts and an RMS power rating of 600 watts, the P3D4-15 is capable of handling plenty of power from your amplifier.

Distortion and Articulation

The P3D4-15’s rigid anodized aluminum cone and Santoprene rubber surround work together to minimize distortion, even at high volume levels. This ensures that your bass remains clean and tight, with the excellent articulation of musical nuances.

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Installation and Compatibility

Enclosure Requirements

For optimal performance, the Rockford Fosgate P3D4-15 requires an appropriate enclosure. The recommended sealed enclosure volume is 1.58 to 3.0 cubic feet, while the recommended vented enclosure volume is 1.75 to 3.0 cubic feet. By choosing the right enclosure, you’ll ensure that your subwoofer delivers the best possible sound quality.

Wiring and Impedance

The dual 4-ohm voice coils of the P3D4-15 provide you with multiple wiring options, allowing you to match your subwoofer’s impedance to your amplifier’s requirements. You can wire the voice coils in parallel for a 2-ohm load or in series for an 8-ohm load.

Compatibility with Amplifiers

To get the most out of your P3D4-15, it’s essential to pair it with a compatible amplifier. Look for an amplifier that can provide at least 600 watts RMS at the impedance you’ve chosen (either 2 or 8 ohms) to ensure optimal performance.

Specification and Buy

Rockford Fosgate P3D4-15 Subwoofer Review

The Rockford Fosgate P3D4-15 is a high-performance 15-inch subwoofer designed for car audio enthusiasts who demand powerful, deep, and accurate bass. Featuring dual 4-ohm voice coils, a rigid anodized aluminum cone, and a powerful motor assembly, the P3D4-15 is built to deliver exceptional low-frequency performance. This subwoofer is compatible with a wide range of amplifiers and provides flexible wiring options for optimal impedance matching. To get the most out of the P3D4-15, it is essential to pair it with a suitable enclosure and amplifier.

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Specification Details
Size 15 inches
Type Standard Subwoofer
Cone Material Anodized Aluminum
Surround Material Santoprene Rubber
Voice Coil Configuration Dual 4-ohm Voice Coils
Peak Power Handling 1200 watts
RMS Power Handling 600 watts
Frequency Response 22Hz – 250Hz
Sensitivity 86 dB
Magnet Type Double-stacked Ferrite
Spider Design VAST (Vertical Attach Surround Technique)
Tinsel Leads Stitched
Terminals Compression Terminals
Sealed Enclosure Volume 1.58 – 3.0 cubic feet
Vented Enclosure Volume 1.75 – 3.0 cubic feet
Warranty 1-year
Price Range $250 – $350

Please note that the price range mentioned above is an estimate and can vary depending on the retailer, discounts, or promotional offers. It is always best to check with multiple retailers for the most accurate and up-to-date pricing.

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Pros and Cons


  1. Powerful bass performance with excellent low-frequency response
  2. A rigid cone and durable surround minimize distortion
  3. High power handling capabilities
  4. Flexible wiring options thanks to dual 4-ohm voice coils
  5. Compatible with a wide range of amplifiers


  1. Requires a relatively large enclosure for optimal performance
  2. May be too powerful for some stock audio systems

Review Video


The Rockford Fosgate P3D4-15 is an excellent choice for those looking to upgrade their car audio system with a powerful, high-quality subwoofer. With its impressive features, exceptional performance, and compatibility with various amplifiers, this subwoofer is a solid investment for any serious car audio enthusiast.

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What type of enclosure is best for the Rockford Fosgate P3D4-15?

It depends on your preferences. A sealed enclosure will provide tighter, more accurate bass, while a vented enclosure will deliver louder, more aggressive bass.

Can I use the P3D4-15 with a factory-installed car audio system?

While it’s possible, you’ll likely need to upgrade your amplifier and potentially other components to handle the power and performance of the P3D4-15.

What is the warranty period for the Rockford Fosgate P3D4-15?

Rockford Fosgate offers a 1-year warranty on the P3D4-15, covering defects in materials and workmanship.

How do I wire the P3D4-15 for a 2-ohm load?

To wire the subwoofer for a 2-ohm load, connect the positive terminal of one voice coil to the positive terminal of the other voice coil, and do the same for the negative terminals. Then, connect your amplifier to one set of terminals.

What is the ideal crossover frequency for the Rockford Fosgate P3D4-15?

A typical crossover frequency for a subwoofer like the P3D4-15 is between 80Hz and 100Hz, but this can vary depending on your specific system and preferences.

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About the Author: Aileen D Ransom

Music is a moral law. It gives soul to the universe, wings to the mind, flight to the imagination, and charm and gaiety to life and to everything.