Kevlar Reinforced Pulp Cone: This Alpine Type-S subwoofer uses
a parabolic cone structure, with a Kevlar reinforced pulp cone and a Poly-Mica dust
cap. Kevlar adds strength and tear resistance to the woofer cone while maintaining
the benefits of a pulp cone design. The oversized, inverted poly-mica dust cap
increases rigidity and virtually eliminates cone distortion at extreme volume
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,
6-layer dual voice coils offer power handling up to 500W RMS / 1500W Peak (250 watts RMS per coil).
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 8-ohm
Spring Terminals: The spring post terminals are all located
on one side of the woofer. The terminals will accept pin connectors, single banana
plugs, or bare wire up to 8 gauge.
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: Alpine recommends a sealed enclosure with an
internal volume between 1.32 and 2.07 cubic feet, with an ideal volume of 1.34
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 Volume: The recommended ported box volume ranges
from 2.07 to 3.07 cubic feet, with the ideal size being 2.67 cubic feet, using
a slot port measuring 16" (W) x 1.25" (H) x 21" (L).
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