Rockford Fosgate T1S-1X12 12" Slim Sealed Subwoofer Enclosure

The Rockford Fosgate T1S-1X12 is a loaded, sealed enclosure built around one 12-inch Power T1 slim subwoofer. It is designed for vehicles where conventional deep subwoofer boxes take up too much usable space. Its shallow wedge profile helps it fit behind truck seats and in other depth-limited cargo areas.

This enclosure is intended for listeners who want a complete bass upgrade without selecting a separate subwoofer and box. The internal subwoofer is factory installed and the enclosure is prewired for a 1-ohm final load. Pair it with a compatible mono amplifier that is stable at 1 ohm and appropriately matched to its 600-watt RMS rating.

The sealed enclosure design is tuned for controlled bass response and integrates well with a wide range of music styles. Its specified frequency response is 27 to 250 Hz, supporting low-frequency extension while retaining upper-bass definition. The enclosure provides 0.85 cubic feet of internal air volume for the installed T1 slim driver.

The T1S-1X12 uses a shallow-mount T1S1-12 subwoofer with a 3-inch, four-layer voice coil and a neodymium motor structure. Rockford Fosgate's VAST surround design increases effective cone area, while its Integrated Copper Cap Heat Sinking shorting ring technology is designed to improve motor linearity and reduce distortion. These engineering elements allow a slim driver to deliver substantial excursion within a compact mounting profile.

The enclosure can serve as the bass foundation for a factory-radio upgrade or as part of a more complete aftermarket audio system. Quick-release input terminals simplify amplifier connection, and included mounting brackets help secure the enclosure in the vehicle. Its single 1-ohm configuration is especially suited to a mono amplifier designed to provide strong output at a 1-ohm load.

Key Features

• Loaded 12-Inch Enclosure: Includes one factory-installed Power T1 slim subwoofer.
• 1-Ohm Final Load: Prewired for compatible 1-ohm-stable mono amplifiers.
• 600-Watt RMS Handling: Supports continuous amplifier power up to 600 watts RMS.
• Sealed Wedge Cabinet: Provides shallow depth for space-conscious vehicle installations.
• Protective Mesh Grille: Helps guard the subwoofer against cargo-area damage.
• Quick-Release Terminals: Makes speaker-wire connection and service more convenient.

Design & Installation

The T1S-1X12 enclosure uses 5/8-inch medium-density fiberboard construction and a durable black carpet finish. It features stitched Rockford Fosgate and Diamond-R logos, along with a heavy-duty mesh grille over the subwoofer. The angled wedge cabinet measures 14.5 inches high by 31.5 inches wide, with depths of 4.2 and 6.3 inches.

Install the enclosure on a solid, flat vehicle surface and use the supplied hold-down brackets and screws to prevent movement while driving. Connect it only to an amplifier rated for a 1-ohm speaker load, then set gain and crossover controls carefully to avoid distortion. Confirm the available mounting width, height, and both enclosure depths before purchase, particularly for behind-seat truck installations.