T1D2/D412

The Rockford Fosgate Power T1D212 and T1D412 are high-performance 30 cm (12-inch) subwoofers from the Power T1 series, designed for powerful, precise bass reproduction and high power handling. With 800 watts RMS and up to 1,600 watts of peak power, they provide an excellent foundation for high-end car audio systems.

The robust Kevlar-paper composite diaphragm, combined with the durable Santoprene surround, ensures controlled diaphragm movement. A sturdy die-cast aluminum basket, a 76-mm voice coil, and the powerful dual-magnet system ensure high mechanical stability and reliable performance even at high volume levels.

Thanks to the dual voice coil, the subwoofers can be flexibly adapted to different amplifier configurations. Both models are suitable for both sealed enclosures and bass-reflex enclosures.

Technical Specifications

• Manufacturer: Rockford Fosgate

• Series: Power T1

• Model: T1D212 / T1D412

• Type: High-Performance Car Audio Subwoofer

• Nominal diameter: 30 cm (12 inches)

• RMS Power Handling: 800 watts

• Maximum Power Handling: 1,600 watts

• Voice coils: 2 (dual voice coil)

• Impedance T1D212: 2 + 2 ohms

• Impedance T1D412: 4 + 4 ohms

• Terminal impedance of T1D212: 1 or 4 ohms

• Terminal impedance T1D412: 2 or 8 ohms

• Voice coil diameter: 76 mm

• Voice coil height: 43 mm

• Voice coil former: Aluminum

• Diaphragm material: Kevlar-paper composite

• Dust cover: Aluminum

• Bead: Santoprene

• Centering: Double Nomex centering spider

• Basket material: Die-cast aluminum

• Magnet system: Dual magnet, 2 × 62 oz

• Magnet weight: approx. 3,515 g

• Linear diaphragm stroke (Xmax): ±16 mm

• Maximum mechanical stroke: ±30 mm

• Effective membrane area (Sd): 548 cm²

• Efficiency: 85 dB (1 W/1 m), according to the technical data sheet

• Outer diameter: 332 mm, including mounting ring

• Installation diameter: 286 mm

• Installation depth: 171 mm

• Shipping weight according to the data sheet: 15.0 kg
  
  

Thiele-Small parameter T1D212 (2 + 2 ohms)

• Resonance frequency (Fs): 28 Hz

• Total Quality (Qts): 0.52

• Electrical Quality (Qes): 0.59

• Mechanical Grade (Qms): 4.50

• Equivalent air volume (Vas): 55.8 liters

• DC resistance (Re): 2 × 1.65 ohms

• Voice coil inductance (Le): 1.8 mH

• Moving mass (Mms): 247 g

• Force factor (BL): 15.5 N/A
  
  

Thiele-Small parameter T1D412 (4 + 4 ohms)

• Resonance frequency (Fs): 29 Hz

• Overall Quality (Qts): 0.61

• Electrical quality (Qes): 0.71

• Mechanical Grade (Qms): 4.50

• Equivalent air volume (Vas): 55.8 liters

• DC resistance (Re): 2 × 3.25 ohms

• Voice coil inductance (Le): 2.4 mH

• Moving mass (Mms): 228 g

• Force factor (BL): 19.6 N/A
  
  

Recommended Cases

Enclosed housing:

• Recommended net volume: 35.4 liters

• Lower cutoff frequency (-3 dB) T1D212: 39 Hz

• Lower cutoff frequency (-3 dB) T1D412: 37 Hz

Bass-reflex enclosure:

• Recommended net volume: 49.6 liters

• Bass reflex port diameter: 100 mm

• Bass reflex port cross-sectional area: 80 cm²

• Bass reflex tube length: 23 cm

• Tuning frequency (Fb): 40 Hz

• Lower cutoff frequency (-3 dB): 32 Hz
  
  

What's Included

• 1 × Rockford Fosgate Power T1D212 or T1D412 subwoofer (depending on the selected model)

• Mounting Ring / Decorative Ring

• Jumper for impedance configuration

• User and Installation Manual