Kevlar Reinforced Pulp Cone: This Alpine Type-E 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 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 ensures
reliability and helps avoid interference typical of many high-excursion designs.
Voice Coil: The oversized (65mm) 3-layer voice coil offers
power handling up to 250W RMS / 750W Peak. The high-temperature voice coil is
wound on a spiral cut aluminum former.
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
Airflow Management System: Alpine's patented Airflow Management
System combined with Perimeter Venting actively manages the outer voice coil
temperatures by forcing air directly across the heatsink system.
Vented Pole Piece: The vented pole piece is flared at both
ends to maximize air flow from inside the motor structure. The Airflow Back Plate
combined with the Compound Radius Curve Extended Pole Geometry ensures that hot
air is not trapped inside the motor structure.
Spring Terminals: The spring post terminals are located on
one side of the woofer. The terminals will accept pin connectors, single banana
plugs, dual banana plugs (with standard 3/4" width), or bare wire up to 8
Gasket Cover: Alpine uses a Concealed Mount Gasket System to
cover the mounting screws for a clean look. The black rubber gasket ring comes
already installed on the woofer and needs to be removed before installing the
mounting screws (not supplied). The gasket ring then snaps back into place once
the woofer is mounted.
Sealed Box: Alpine recommends a sealed enclosure with an
internal volume between 0.69 and 1.04 cubic feet, with an ideal volume of 0.9
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 1.04 cubic feet to 1.54 cubic feet, with the ideal size being 1.45 cubic
feet, using a slot port measuring 12.5" (W) x 1" (H) x 18" (L).
This recommended enclosure has a tuning frequency of 36 Hz.
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