Dual Voice Coils: For increased
system flexibility, the woofer has two 4" 2 ohm voice coils. When the voice
coils are wired in parallel with each other, the woofer presents a 1 ohm mono
load. When the voice coils are wired in series with each other, the woofer
presents a 4 ohm mono load. In addition, each coil may be connected to a
different amplifier channel and each channel will see a 2 ohm load.
Cone: This new high performance paper stock is a combination of
natural and regenerated cellulose fibers interlaced with a third, longer fiber.
The three natural fibers are chemically fused together with a blend of three
interactive binding agents. The extremely high fibril strength and toughness
comes from the combination of all six of these component layers. FIBERLock is
light, tough and it's proven to have superior sound quality and incredible
durability. The cone is then treated with a Thermally Cured Acrylic Emulsion
that seals the cone body for exceptional damping and even greater rigidity,
resulting in industrial strength power handling.
BART Santoprene Rubber Surround: The BART surround has a
large roll to assure maximum cone travel. By increasing cone travel, the BART
surround allows the woofer to produce more bass. Santoprene is a durable and
temperature tolerant rubber material that provides the consistent support needed
for linear speaker cone motion. In addition, the damping capabilities of
santoprene eliminate the transmission of sonic disturbances between the cone and
the frame of the speaker, improving the accuracy of the woofer's low frequency
Punch LX Cast
Basket: The woofer uses a cast aluminum frame that reduces frame flex
and offers increased stability over a stamped steel frame. This frame offers the
lowest coloration of sound due to the added strength. To help prevent the spider
from hitting the bottom of the basket ("soft bottoming"), the LX Cast
basket features a deep step that moves the physical boundaries of the basket
further away from the spider; this allows the cone far greater travel and,
therefore more bass, without soft bottoming.
Formers: The aluminum formers allow the voice coils to
efficiently dissipate heat, resulting in improved power handling.
Laminated Progressive Flat Spider: The dual laminated
progressive flat spider provides a very strong suspension for the woofer. A
secondary spider is fused to the primary spider near the critical voice coil
bonding point. The combination of the two spiders, in addition to the
progressive rolls in the spiders, provides the ultimate in linear control for
high excursion capability.
Pole Piece: The pole piece is extended in length to lower distortion
and provide better low frequency response by operating the voice coil in a
linear fashion throughout its travel in the magnetic field.
Punch LX Long
Xmax Voice Coils: The L-xtended winding coils
allow the voice coil to stay in the magnetic gap longer, resulting in less
distortion and more control. Combine the L-xtended coil with the hyper-extended
pole piece and the result is a huge magnetic sweet spot and deeper, louder,
Back Plate: The back plate has been bumped to allow the woofer more
room for excursion without bottoming out. Additionally, "Aerovent"
cooling efficiently and quietly circulates cool air around the voice coil using
a back plate that is vented with a radiused aerodynamic back vent. By keeping
the voice coil cooler, power handling is improved.
Rubber Magnet Boot: A black
rubber boot covers the exposed edge of the magnet structure to improve the
cosmetics of the woofer and protect the magnet during installation. The rubber
boot looks great when the woofer is mounted in an enclosure with a window that
allows you to see the back of the woofer.
CONsealer Gasket: A newly
designed front gasket conceals mounting screws and provides an airtight seal
between the woofer frame and the mounting surface. A better seal increases the
amount of bass due to the elimination of air leaks.
The woofer has two sets of 5-way platinum binding posts, one set for each voice
coil. The binding posts will accept banana plugs, dual banana plugs, spade
connectors, pin connectors and bare wire.
Enclosure Compatibility: This
woofer can provide extended bass in sealed and ported enclosures (see the
"Specifications" section for more information on enclosures).
Recommended Sealed Box
Volume: Rockford Fosgate recommends a 1.25 cu/ft sealed enclosure.
Recommended Ported Box
Volume: The ported box volume range recommended by Rockford Fosgate is
2.0 cu/ft to 4.0 cu/ft. Within this range, the ideal size recommended by
Rockford Fosgate is 2.5 cu/ft, so this is the enclosure recommended by
Crutchfield. One 4" diameter x 8" long port, tuned at 35Hz, should be
used with a 2.5 cu/ft enclosure.
Handling: The woofer has two 2 ohm voice coils, and each coil
can handle up to 500 watts RMS (1000 watts peak).