Dual 4-ohm Voice Coils: This
woofer features dual 4-ohm voice coils that offer flexibility in wiring. When
the voice coils are wired in parallel with each other, the woofer presents a
2-ohm mono load. When the voice coils are wired in series with each other, the
woofer presents an 8-ohm mono load. In addition, each coil may be connected to a
different amplifier channel and each channel will see a 4-ohm load.
The aluminum parabolic woofer cone is lightweight and extremely strong, giving
the woofer very high power handling, low distortion, and superior bass response.
High Excursion Thermo-Rubber Surround:
The use of a "tall/skinny" high excursion thermo-rubber surround allows for
linear cone travel on a high excursion driver without reducing cone area.
Parabolic Triangular Cone Geometry
Support System: By bonding an aluminum parabolic dust cap of equivalent size
to the cone body, a balanced triangular structure is created. This system
reduces piston flex and eliminates cone distortion.
Mirror Image Symmetrical Spiders: Dual-opposing spiders
offer superior mechanical stability during high excursions, while maintaining
Spider Support Ring: This
integrated ring increases the bonding surface area between the voice coil former
and spider, establishing a stronger joint. The result is increased mechanical
power handling under high power/high excursion situations.
Anodized Aluminum 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.
Precision Cast Aluminum Alloy
Basket: A two-piece "basket in a bucket" design adds rigidity and eliminates
multiple acoustic resonances. Additionally, the large aluminum mass helps reduce
voice coil former temperature and increase power handling.
Double Stacked Magnet Motor
Assembly: The stacked magnet assembly is used to create a powerful linear
motor with increased excursion capability for superior bass output.
Spring Terminals: The
proprietary, slot-loaded spring terminals will accept pin connectors and up to
8-gauge bare wire.
Concealing Ring: Once the
subwoofer is mounted, the metal concealing ring can be installed to hide the
mounting screws, giving the subwoofer a finished look.
Recommended Sealed Box
Volume: Rockford Fosgate recommends mounting this woofer in a sealed
enclosure with an internal volume of between 0.5 cu/ft. and 1.0 cu/ft. with an
ideal volume of 0.75 cu/ft.
Recommended Vented Enclosures:
Rockford Fosgate recommends mounting the woofer in a vented enclosure with an
internal volume of between 1.0 cu/ft. and 2.0 cu/ft. with an ideal volume of 1.5
cu/ft. One 4" port is recommended at the following lengths for each size
|Box Size ||Box Volume ||Port Length |
|Minimum ||1.0 cu/ft. ||18" |
|Recommended ||1.5 cu/ft. ||11" |
|Maximum ||2.0 cu/ft. ||7.5" |
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