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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
HAMRS: The woofer features a High Amplitude Multi Roll
Surround (HAMRS), made of injection molded Santoprene, that allows a large
linear excursion and greater SPL. The HAMRS design allows extreme excursions
without sacrificing valuable cone area.
Cast Aluminum Frame: The woofer is mounted to a custom cast
aluminum frame for added strength. This high mass frame also dissipates heat quickly
to make it an integral part of the woofer's thermal management system.
Mirrored Progressive Nomex Spiders: This subwoofer has twin
mirrored progressive Nomex spiders for added durability and mechanical stability.
The custom progressive rolls give the woofer a longer, more linear stroke with
maximum centering and restoring force. Special edge control design and Nomex
construction provide excellent tear resistance, strength and long-term reliability.
The woofer has integrated tinsel speaker leads that are woven into the spiders for
the one-sided terminal layout.
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 Coils: The oversized (65mm), high-temperature,
4-layer dual voice coils offer increased power handling to 750W RMS / 2000W Peak.
Dual Voice Coils: For system flexibility, the woofer has two
2-ohm voice coils. When the voice coils are wired in parallel, the woofer presents
a 1-ohm load. When the voice coils are wired in series, the woofer presents a 4-ohm
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 1-ohm load) or series (for a 4-ohm load).
Sealed Box Volume: The recommended sealed box volume ranges
from 1.3 cubic feet to 2.5 cubic feet, with 1.75 cubic feet being the ideal
Ported Box Volume: The recommended ported box volume ranges
from 1.5 cubic feet to 3.0 cubic feet. The ideal size is 2.9 cubic feet, using
a slot port measuring 15" (W) x 1.5" (H) x 27" (L).