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Dual 4-ohm Voice Coils: The Rockford Fosgate T0D412 subwoofer
features dual 4-ohm voice coils and a jumper to easily wire them in series or
parallel; 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 selecting 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 2-ohm position the voice coils are wired
in parallel; with the jumper in the 8-ohm position the voice coils are wired
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. The surround is made of durable Santoprene.
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.
Motor Assembly: The double stacked magnet assembly, extended
pole, and bumped back plate are used to create a powerful linear motor with increased
excursion capability for superior bass output.
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 T0D412 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.
FlexFit Basket: The Flex Fit frame utilizes slots (where
possible) instead of single screw sized holes; allowing slight adjustment of
the speaker when mounted.
Ported Box: Two ported enclosures are recommend:
- Optimum: internal volume of 1.75 cubic
feet using one 4" diameter x 9" long port; this
yields a tuning frequency of 40 Hz
- High Output: internal volume of 3.12
cubic feet using a 3" x 13-3/4" x 25-3/4" slot loaded port;
this yields a tuning frequency of 40 Hz
Sealed Box: When using a sealed enclosure, Rockford recommends
an internal volume of 1.25 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.