Gravity GW15D4 15" Dual 4-Ohm Car Subwoofer

The Gravity GW15D4 is a 15-inch car audio subwoofer designed for systems that need dedicated low-frequency reproduction. Its large woofer format is intended for custom vehicle installations using a separate enclosure and compatible external amplification. The single-subwoofer package is suited to bass-focused upgrades rather than full-range speaker replacement.

This model uses a dual 4-ohm voice-coil configuration, giving an installer wiring flexibility when matching the subwoofer to an amplifier. Final amplifier load depends on the wiring method and the overall system design. Proper impedance matching is important for reliable operation.

The GW15D4 is listed with 3,500 watts peak power handling, a 30 Hz to 500 Hz frequency-response range, and 85 dB sensitivity. These specifications position it for low-frequency duties in a car audio system. A low-pass crossover on the amplifier or processor is typically used to limit the subwoofer to bass frequencies.

A pressed paper cone provides the main diaphragm, while the high-roll foam surround supports cone movement. Gravity also lists an advanced air-flow cooling system intended to help manage heat during operation. Together, these construction details are aimed at supporting sustained bass playback in an appropriately configured system.

For an upgrade path, the GW15D4 can be paired with a properly matched mono or multichannel amplifier, a suitable subwoofer enclosure, and correctly sized wiring. Its 15-inch size makes enclosure planning especially important before purchase. Professional installation is recommended when selecting enclosure type, amplifier settings, and voice-coil wiring.

Key Features

• 15-Inch Woofer: Provides a large radiating area for dedicated bass reproduction.
• Dual 4-Ohm Voice Coils: Supports flexible amplifier-load wiring options.
• 3,500W Peak Handling: Listed peak-power capability for high-output system planning.
• Pressed Paper Cone: Forms the main cone assembly for bass playback.
• High-Roll Foam Surround: Supports cone travel while forming the outer suspension.
• Air-Flow Cooling System: Helps manage heat around the motor and voice-coil area.

Design & Installation

The GW15D4 combines a competition-grade pressed paper cone with a high-roll foam surround and dual voice coils. Its design also incorporates Gravity's listed advanced air-flow cooling system. These elements are intended for a dedicated automotive subwoofer installation rather than free-air use without a system plan.

Install the subwoofer in a properly designed sealed or ported enclosure, with an amplifier that is stable at the final impedance created by the dual 4-ohm coils. Confirm available mounting space, enclosure volume, wiring configuration, and amplifier crossover settings before installation. The product is a wired car-audio component and should be installed with appropriate power, ground, speaker wiring, and protection hardware.