The Rockford Fosgate T1S-1X12 is a premium slim loaded enclosure featuring a single 12-inch Power Series shallow-mount subwoofer in a sealed truck-style enclosure. Designed for vehicles with limited mounting depth, this enclosure delivers true high-output bass while fitting behind truck seats, under rear seats, and in compact cargo areas. It’s one of the most respected shallow subwoofer systems on the market because it combines real T1 performance with minimal space requirements Main Features Single 12” Power Series shallow subwoofer Sealed loaded enclosure 600 watts RMS / 1200 watts peak Slim truck-style enclosure design 1-ohm final impedance Carbon Fiber/PMI/Glass Fiber cone Aluminum dust cap Injection molded foam surround with VAST™ technology Dual progressive Nomex spiders Mounting brackets included Designed for compact installations Specs Specification Details Subwoofer Size 12" RMS Power 600W Peak Power 1200W Final Impedance 1Ω Enclosure Type Sealed Frequency Response 27Hz – 250Hz Sensitivity 85 dB Mounting Depth ~3" Enclosure Width 31.5" Enclosure Height 14.5" Bottom Depth 6.3" Top Depth 4.2" Internal Airspace 0.85 ft³ Approx. Shipping Weight ~38–45 lbs