STX Audio STX12SD4 12" Shallow-Mount Subwoofer

The STX Audio STX12SD4 is a 12-inch shallow-mount car subwoofer designed for systems where enclosure depth is limited. Its 3.51-inch mounting depth helps make it suitable for compact custom enclosures and other space-conscious vehicle installations. The dual 4-ohm voice-coil design provides wiring flexibility when matching the subwoofer to a compatible amplifier.

Rated for 1000 watts RMS and 2000 watts maximum power, the STX12SD4 is intended for car audio systems that need substantial low-frequency output from a shallow driver. Its stated 20Hz to 500Hz frequency-response range covers deep bass frequencies while extending into the upper-bass region. This makes it a practical option for listeners building a dedicated bass section into an upgraded vehicle audio system.

The shallow profile addresses a common installation challenge in trucks, compact cars, and low-profile enclosure projects: fitting a full-size 12-inch subwoofer without requiring the depth of a conventional design. An 11.26-inch cutout requirement and 12.80-inch overall diameter should be checked against the planned enclosure before installation. Careful measurement remains important because mounting clearance can vary by vehicle and enclosure construction.

STX Audio uses a die-cast aluminum basket for the STX12SD4. This rigid basket construction supports the driver assembly and is intended to help limit unwanted structural vibration. The result is a durable foundation for a subwoofer installed in a properly designed enclosure.

For a complete system, the STX12SD4 needs an external amplifier, an appropriate enclosure, and correctly sized wiring. Its dual 4-ohm voice coils allow the installer to select a wiring arrangement that suits the amplifier's supported load. Matching amplifier output to the 1000-watt RMS rating and following amplifier and enclosure guidance are important parts of a reliable installation.

Key Features

• 12-Inch Shallow Driver: Delivers bass capability in installations with limited mounting depth.
• 1000W RMS Handling: Supports use with a properly matched external amplifier.
• 2000W Maximum Power: Provides the stated peak power-handling specification.
• Dual 4-Ohm Voice Coils: Offers flexible wiring choices for compatible amplifiers.
• 3.51-Inch Mounting Depth: Helps fit low-profile and compact enclosure designs.
• Die-Cast Aluminum Basket: Provides a rigid structural platform for the driver.

Design & Installation

The STX12SD4 combines a full 12-inch subwoofer format with a shallow-mount layout. Its die-cast aluminum basket is the confirmed structural component, and the driver has a 12.80-inch overall diameter. The design is intended for installations that need a lower-profile subwoofer rather than a deeper conventional driver.

Confirm the enclosure has at least the required 11.26-inch cutout and sufficient depth for the 3.51-inch mounting specification before purchase. Use an enclosure appropriate for the driver and connect the dual 4-ohm voice coils according to the amplifier's approved impedance range. An amplifier, enclosure, wiring, and installation hardware are separate system requirements unless supplied by the retailer.