Features
Enclosure Compatibility

Features

Dual 4Ω Voice Coils: The Rockford Fosgate T1D410 subwoofer features dual 4Ω voice coils and a jumper to easily wire them in series or parallel, presenting either a 2Ω or 8Ω load; the voice coils cannot be easily wired separately.

SWIFT Terminal: Rockford's proprietary SWIFT Terminal (Selectable Woofer Impedance Fused Termination) offers a simple and convenient method of setting the impedance presented by the dual voice coil subwoofer. The impedance jumper also provides fused protection from severe overload conditions. With the jumper in the 2Ω position the voice coils are wired in parallel; with the jumper in the 8Ω position the voice coils are wired in series.

Woofer: The Kevlar fiber reinforced paper cone has a hard anodized aluminum dust cap of equivalent size; the result is a lightweight and extremely strong cone, reducing piston flex and cone distortion.

VAST Surround: The Vertical Attach Surround Technique (VAST) increases a speaker's effective radiating cone area without increasing the size of the basket.

Voice Coil Former: Aluminum voice coil formers offer superior heat dissipation over other commonly used materials. The hard-anodized finish increases the former strength. These two factors combine to improve the overall power handling characteristics of the subwoofer.

Cast Aluminum Basket: The basket is a die-cast aluminum design to add rigidity and eliminate multiple acoustic resonances. Additionally, the large aluminum mass helps reduce voice coil former temperature and increase power handling.

Terminals: The proprietary spring terminals will accept bare wire up to 8-gauge.

Grille: A metal grille is included to protect the subwoofer and add a finished look. If the sub is bottom mounted and the back is visible, the grille can be disassembled and just the trim ring can be installed to cover the mounting screws.

CEA-2031 Compliant: Power handling on the T1D410 subwoofer conforms to CEA-2031 industry standards. This means the subwoofer has the capacity to handle its rated power under continuous demand, not just for an instant.

Klippel Verified: The Klippel distortion analyzer, a device that uses a laser and sophisticated software to do large-scale analysis of drivers in motion, lets Rockford Fosgate optimize the subwoofer's motor structure, voice coil alignment, and suspension to yield the best possible performance.

Inductive Damping Heat Sink: The Inductive Damping Heat Sink (IDHS) secures directly to the top of the magnet structure to improve system efficiency by reducing both distortion and back EMF (Electro-Magnetic force). It also radiates heat to reduce the voice coil temperature.

FlexFit Basket: The Flex Fit frame utilizes slots (where possible) instead of single screw sized holes; allowing slight adjustment of the speaker when mounted.

Enclosure Compatibility

Sealed Box: When using a sealed enclosure, Rockford recommends an internal volume of 0.75 cubic feet. Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.

Ported Box: Two ported enclosures are recommended:

• Optimum: internal volume of 1.5 cubic feet using one 4" diameter x 11" long port; this yields a tuning frequency of 40 Hz and a -3 dB point of 32 Hz
• High Output: internal volume of 2.04 cubic feet using a 2" x 12" x 25-1/2" slot port; this yields a tuning frequency of 38 Hz