Rockford Fosgate P1S2-15 15" 2-Ohm SVC Subwoofer

The Rockford Fosgate P1S2-15 is a 15-inch car-audio subwoofer designed to add dedicated low-frequency output to a vehicle sound system. Its single 2-ohm voice coil makes it a straightforward choice for an amplifier rated to operate at a 2-ohm load. With 250 watts RMS power handling, it suits systems built for controlled bass reinforcement rather than excessive amplifier power.

This subwoofer is intended for listeners who want the added low-end presence of a 15-inch driver while working within a moderate power range. The large cone area helps it move substantial air, supporting bass that can fill larger vehicle cabins. It can be used in either a sealed or ported enclosure, allowing the installation to be tailored to available space and listening preferences.

The P1S2-15 uses a Kevlar-paper composite cone, Kevlar dustcap, foam surround, and steel basket. Its 50 mm voice coil is built on an aluminum former, while the single-spider suspension supports stable cone movement. The driver is rated for ±9 mm of linear excursion and a maximum mechanical excursion of ±27 mm.

For enclosure planning, Rockford Fosgate specifies a 44.7-liter sealed enclosure or a 75.3-liter ported enclosure. The recommended ported alignment uses a 100 mm diameter port with 80 cm² of port area, a 20 cm port length, and a 34 Hz tuning frequency. These published alignments give installers a practical starting point for building an enclosure around the driver.

The P1S2-15 works well as the bass foundation in a system with full-range door speakers and a dedicated mono or subwoofer amplifier. Its 2-ohm single voice coil should be paired with an amplifier that is stable at 2 ohms and appropriately configured for its 250-watt RMS rating. Allow for its 177 mm mounting depth and 353 mm mounting cutout when selecting or building an enclosure.

Key Features

• 15-Inch Subwoofer: Large cone area supports strong low-frequency output in car-audio installations.
• 2-Ohm SVC Design: A single 2-ohm voice coil simplifies amplifier and wiring selection.
• 250 Watts RMS: Continuous power rating supports proper amplifier matching and system setup.
• Kevlar-Paper Composite Cone: Composite cone construction provides a rigid diaphragm for bass reproduction.
• 50 mm Voice Coil: High-temperature voice coil uses an aluminum former for thermal durability.
• Sealed Or Ported Compatibility: Published enclosure recommendations support different installation goals.

Design & Installation

The P1S2-15 is constructed around a steel basket with a Kevlar-paper composite cone, Kevlar dustcap, and foam surround. A single spider with embedded tinsel leads supports the moving assembly, while the aluminum voice-coil former and 50 mm coil are designed for the driver’s rated power range. Custom 10-AWG nickel-plated push terminals provide the speaker-wire connection point.

Install the subwoofer in an enclosure with at least a 353 mm mounting cutout and 177 mm of mounting-depth clearance. For a sealed build, use the specified 44.7-liter enclosure volume; for a ported build, use the 75.3-liter recommendation with the published port dimensions and 34 Hz tuning. Pair it with a 2-ohm-stable subwoofer amplifier and set gain carefully to remain within the 250-watt RMS rating.