Gravity G3-15D4 15" Dual 4-Ohm Car Subwoofer

The Gravity G3-15D4 is a 15-inch component car subwoofer for systems that need dedicated low-frequency output beyond what full-range speakers can provide. Its dual 4-ohm voice-coil design gives installers series or parallel wiring flexibility when matching the subwoofer to an amplifier. This model is intended for use in a properly designed enclosure and vehicle audio system.

With 1,200 watts RMS power handling and a 2,400-watt peak rating, the G3-15D4 is suited to higher-power bass systems when paired with an amplifier that is stable at the selected final impedance. Its 30 Hz to 500 Hz published frequency-response range covers low bass through upper-bass frequencies. The 87 dB sensitivity rating provides a useful reference when planning amplifier power and overall system output.

The subwoofer uses a competition-grade pressed paper cone paired with a high-roll foam surround. This combination is designed to support cone movement while maintaining a durable interface between the cone and frame. The result is a purpose-built low-frequency driver for custom car-audio installations.

Gravity specifies an advanced air-flow cooling system to help manage heat during extended operation. Thermal management is important in a high-power subwoofer system because excessive heat can affect long-term voice-coil performance. Proper gain setting and clean amplifier power remain essential for reliable operation.

The G3-15D4 fits upgrade paths ranging from a single custom bass enclosure to multi-subwoofer systems. Its two 4-ohm voice coils may be wired in parallel for a 2-ohm final load or in series for an 8-ohm final load per subwoofer. Select an enclosure, amplifier, wiring, and electrical support appropriate for the vehicle and intended listening level.

Key Features

• 15-Inch Woofer: Provides substantial cone area for dedicated bass reproduction in a custom vehicle system.
• 1,200W RMS Handling: Supports amplifier matching based on continuous power rather than peak-only ratings.
• Dual 4-Ohm Voice Coils: Allows 2-ohm parallel or 8-ohm series wiring for one subwoofer.
• Pressed Paper Cone: Uses a competition-grade cone material specified for low-frequency playback.
• High-Roll Foam Surround: Supports cone travel and is designed for durable use.
• Air-Flow Cooling System: Helps manage heat during extended high-power operation.

Design & Installation

The G3-15D4 combines a pressed paper cone, high-roll foam surround, large motor structure, and spring-loaded terminals in a purpose-built subwoofer design. Its 15-inch format requires a suitably rigid enclosure and adequate cargo-space planning. Keep the cone and surround clean, and avoid harsh chemicals or excessive moisture during maintenance.

Install the subwoofer securely in a sealed, ported, or bandpass enclosure designed for a 15-inch driver, with no air leaks or mounting obstructions. Wire its dual 4-ohm coils in series for 8 ohms or parallel for 2 ohms, and verify that the amplifier is stable at the resulting load. Set amplifier gain conservatively, use an appropriate low-pass filter, and avoid audible distortion or excessive bass boost.