Gravity GR-15PW 15" Dual 4-Ohm Car Subwoofer

The Gravity GR-15PW is a 15-inch car audio subwoofer built for systems that need dedicated low-frequency output. Its large driver format is intended to move substantial air while adding bass impact beyond typical factory speaker systems. It is suited to vehicle audio upgrades where an external amplifier and subwoofer enclosure are part of the build.

This model uses dual 4-ohm voice coils, giving installers wiring flexibility when matching the subwoofer to a compatible mono or multi-channel amplifier. The two coils may be wired in parallel for a 2-ohm final load or in series for an 8-ohm final load. Confirm that the amplifier is stable at the selected impedance before installation.

The GR-15PW is specified with 1,600 watts RMS power handling and 3,200 watts peak power handling. Its listed 30 Hz to 2.5 kHz frequency response and 90 dB sensitivity support use as a dedicated bass driver. For balanced system integration, use an amplifier or processor low-pass filter so the subwoofer receives the bass range it is designed to reproduce.

A competition-grade pressed paper cone forms the main radiating surface, while a high-roll foam surround supports cone travel. This combination is designed to support low-frequency reproduction in a car audio enclosure. The subwoofer also uses an advanced airflow cooling system to help manage heat during extended operation.

The GR-15PW can be used in sealed or ported enclosure designs, depending on the desired balance of enclosure size, output, and bass character. A 15-inch subwoofer requires adequate mounting clearance and a rigid enclosure that is properly secured in the vehicle. It is a component subwoofer, so an amplifier, enclosure, wiring, and installation hardware are needed separately unless supplied by a particular bundle.

Key Features

• 15-Inch Subwoofer: Large driver area supports strong low-frequency output.
• Dual 4-Ohm Voice Coils: Enables 2-ohm or 8-ohm series/parallel wiring options.
• 1,600W RMS Handling: Supports use with a suitably matched external amplifier.
• 3,200W Peak Handling: Provides a stated short-term maximum power rating.
• Pressed Paper Cone: Forms a lightweight cone for bass reproduction.
• Airflow Cooling System: Helps manage voice-coil heat during operation.

Design & Installation

The GR-15PW uses a competition-grade pressed paper cone, high-roll foam surround, dual voice-coil motor structure, and airflow cooling design. The cone and surround are designed for subwoofer duty, while the 15-inch frame requires a solid, accurately cut mounting baffle. Its published item weight is 20.6 pounds, so the enclosure and mounting surface should be robust enough to support it securely.

Install the GR-15PW in a properly sized sealed or ported enclosure with sufficient depth and clearance for the driver. Wire both 4-ohm voice coils correctly and use an amplifier rated for the resulting final impedance; parallel wiring produces 2 ohms, while series wiring produces 8 ohms. Use a low-pass filter and set amplifier gain carefully to avoid distortion or clipping.