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Kevlar Reinforced Pulp Cone: This Alpine Type-R subwoofer has
a two-piece structural parabolic Kevlar reinforced pulp cone. Kevlar adds strength
and tear resistance to the woofer cone while maintaining the benefits of a pulp
cone design. There is also an oversized inverted poly-mica dust cap, which increases
rigidity and virtually eliminates cone distortion at extreme volume levels.
HAMRS: The woofer features a High Amplitude Multi Roll Surround
(HAMRS), made of Santoprene, that allows a large linear excursion and greater SPL.
The HAMRS design allows extreme excursions without sacrificing valuable cone area.
Progressive Spider: The progressive Conex spider has reinforced
layer tinsel leads to ensure reliable and consistent control of the tinsel leads and
eliminate any mechanical noise or interference often seen in high excursion cone
Compound Radius Curve Pole Geometry: Alpine's Patented Compound
Radius Curve pole geometry ensures a symmetrical magnetic field, while optimizing
flux density to reduce distortion and further improve power handling and output.
Oversized Voice Coil: The oversized (65mm), high-temperature,
4-layer dual voice coils offer increased power handling to 1000W RMS / 3000W Peak.
Dual Voice Coils: For system flexibility, the woofer has two
4-ohm voice coils. When the voice coils are wired in parallel, the woofer presents
a 2-ohm load. When the voice coils are wired in series, the woofer presents an
Spring Terminals: The spring post terminals are all located
on one side of the woofer. The terminals will accept bare wire up to 8 gauge, pin
connectors, or banana plugs.
Jumpers: Included with the woofer are two voice coil terminal
jumpers. These jumpers allow you to easily wire the voice coils in parallel (for a
2-ohm load) or series (for an 8-ohm load).
Sealed Box Volume: The recommended sealed box volume ranges
from 0.65 cubic feet to 1.1 cubic feet, with 0.85 cubic feet being the ideal
Ported Box Volume: The recommended ported box volume ranges
from 1.1 cubic feet to 1.6 cubic feet. The ideal size is 1.48 cubic feet, using
a slot port measuring 12-1/2" (W) x 1" (H) x 19" (L).