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Kevlar Reinforced Pulp Cone:
This Alpine Type-E subwoofer has a Kevlar reinforced pulp cone. Kevlar adds
strength and tear resistance to the woofer cone while maintaining the benefits
of a pulp cone design.
Santoprene Rubber Surround: The
high-excursion 3/4" Santoprene rubber surround is durable and resistant to the
elements, resulting in a very reliable performance. The surround is specially
designed to resist deformation that is common in woofers with wide surrounds.
This design gives the surround more control over the woofer cone to reduce
distortion and possible driver failure.
Dual Progressive Nomex Spiders:
This subwoofer has dual Nomex spiders for added stability and mechanical
durability. The custom progressive roll gives 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
Gasket Cover: Alpine uses a
Concealed Mount Gasket System to cover the mounting screws for a clean look.
Custom High Strength Steel Basket:
The frame is custom stamped from high strength steel.
Bumped Back Plate and Extended
Vented Pole Piece: This woofer combines a bumped back plate and an extended
pole piece, giving it a nearly 1" peak-to-peak cone excursion. This extra long
cone movement provides a higher bass output.
Sealed Box Volume: The sealed
box sizes recommended by Alpine range from 0.8 cu/ft to 1.7 cu/ft.
Frequency Response: The manual
lists the frequency response as "Fs-1 kHz" (Fs=Free Air Resonance frequency).
According to Alpine, the actual frequency response is 28 Hz to 1 kHz.