STX Audio STXW12D4 12-Inch Dual 4-Ohm Subwoofer

The STX Audio STXW12D4 is a 12-inch dual-voice-coil subwoofer intended for car audio systems that need a dedicated low-frequency driver. Its dual 4-ohm coil arrangement gives installers options when matching the speaker to a compatible amplifier. This is a passive subwoofer, so it requires an external amplifier and a suitable enclosure.

With a listed 1,500-watt RMS rating and 3,000-watt peak-power rating, the STXW12D4 is designed for high-output bass systems. Its 93 dB ± 2 dB sensitivity rating indicates relatively efficient output under the stated 1W/1m test condition. Proper gain setting and amplifier matching remain important for reliable operation.

The speaker uses a 75.5 mm voice coil with a listed 36 mm winding length. This large coil assembly is paired with a dual-magnet motor structure to support the driver during demanding playback. The design focuses on controlled low-frequency output for vehicle-based audio installations.

Each of the two voice coils is rated at 4 ohms. Wiring the coils in parallel presents a 2-ohm nominal load, while series wiring presents an 8-ohm nominal load. The appropriate configuration depends on the amplifier's stable impedance range and the rest of the system design.

The STXW12D4 has a listed frequency range of 50 Hz to 2 kHz and is described for use in sealed or ported enclosures. Its 12-inch nominal size makes it suitable for custom enclosure projects where mounting dimensions and airspace are verified before installation. Select an enclosure and crossover settings that suit the intended bass response and amplifier setup.

Key Features

• 12-Inch Subwoofer: Adds a dedicated low-frequency driver to a car audio system.
• Dual 4-Ohm Voice Coils: Supports 2-ohm parallel or 8-ohm series wiring.
• 1,500W RMS Rating: Provides a continuous-power reference for amplifier matching.
• 3,000W Peak Rating: Lists short-term maximum power handling capability.
• 75.5 mm Voice Coil: Uses a large voice-coil assembly for demanding playback.
• Dual-Magnet Motor: Uses two 190 mm by 25 mm magnets.

Design & Installation

The STXW12D4 combines a 75.5 mm voice coil with a dual-magnet motor structure. The listed magnet arrangement uses two magnets measuring 190 mm in diameter and 25 mm thick. Its reported nominal diameter is 12 inches, with a listed full diameter of 324 mm.

Install the driver in a properly designed sealed or ported enclosure after confirming the enclosure's mounting opening, depth clearance, and volume requirements; those measurements are not confirmed in the available product data. Use speaker wiring appropriate for the amplifier load, and wire the dual 4-ohm coils only to an amplifier rated to operate at the resulting 2-ohm or 8-ohm nominal load. An external amplifier, enclosure, wiring, and mounting hardware are required but are not confirmed as included.