Rockford Fosgate R2D4-10 10" Dual 4-Ohm Subwoofer

The Rockford Fosgate Prime R2D4-10 is a 10-inch dual voice coil car subwoofer designed to add dedicated low-frequency output to an aftermarket audio system. It is a practical upgrade for listeners who want fuller bass than factory door speakers can deliver. With 250 watts RMS power handling, it is suited to properly matched moderate-power subwoofer amplifiers.

This model uses dual 4-ohm voice coils to provide installation flexibility when selecting amplifier loads and wiring configurations. A single R2D4-10 can be wired for a 2-ohm or 8-ohm final load, depending on whether its coils are connected in parallel or series. That flexibility can also help when planning a multi-subwoofer system.

The R2D4-10 is engineered for controlled bass performance in either sealed or vented enclosures. A sealed enclosure is appropriate where compact size and tighter response are priorities, while the recommended vented design extends lower-frequency output. Its 10-inch format is well suited to many trunks, hatchbacks, trucks, and custom vehicle-specific enclosures.

A mica-injected polypropylene cone, poly-foam surround, and poly-cotton spider support consistent movement of the woofer assembly. The high-temperature copper voice coil uses an aluminum former, while the optimized motor uses an extended pole and bumped, vented backplate. The StampCast steel basket integrates spider venting to help manage heat around the motor assembly.

Use the R2D4-10 as the bass foundation of a system with an external amplifier and a correctly sized enclosure. Its dual 12 AWG compression terminals provide secure speaker-wire connections, and its integrated PVC trim ring gives the installation a finished appearance. For system setup, Rockford Fosgate recommends an active low-pass crossover in the 80 to 100 Hz range at 12 dB per octave for subwoofer use.

Key Features

• 250 Watts RMS Handling: Supports amplifier matching up to its continuous 250-watt RMS rating.
• Dual 4-Ohm Voice Coils: Allows series or parallel wiring flexibility for compatible amplifiers.
• 10-Inch Subwoofer: Adds dedicated bass without requiring the space of larger drivers.
• Mica-Injected Polypropylene Cone: Provides a rigid, moisture-resistant cone material for bass reproduction.
• Vented StampCast Basket: Helps support cooling around the spider and motor assembly.
• Sealed Or Vented Compatibility: Supports different enclosure goals for space and bass extension.

Design & Installation

The R2D4-10 combines a heavy-gauge proprietary stamped-steel frame with a mica-injected polypropylene cone, sealed poly-foam surround, and fatigue-resistant poly-cotton spider. Its high-temperature copper voice coil is wound on an aluminum former, and the motor structure includes an extended pole with a bumped, vented backplate. A removable PVC motor cover, integrated PVC trim ring, flexible stitched-on lead wires, and metal compression terminals complete the design.

Confirm available enclosure volume, mounting depth, and cutout space before installation: this subwoofer requires a 9.125-inch cutout and 4.319 inches of mounting depth. Rockford Fosgate specifies a 0.59-cubic-foot sealed enclosure or a 1.40-cubic-foot vented enclosure tuned to 43 Hz; enclosure displacement and port displacement should be considered during box construction. Match the final voice-coil wiring load to an amplifier rated for that impedance, set gain carefully, and use a low-pass crossover for integration with full-range speakers.