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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. There is also an oversized inverted dust cap of the same
material, which increases rigidity and virtually eliminates distortion at
extreme volume levels.
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 most 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 progressive Nomex spiders for added stability and mechanical
durability. The custom progressive rolls 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
reliability. The tinsel speaker leads are integrated into the top spider.
Custom High Strength Steel
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 1.5" peak-to-peak cone excursion. This extra
long cone movement provides a higher bass output.
Enclosure Compatibility: This
woofer can provide extended bass in sealed and ported enclosures (please see the
"Enclosure Compatibility" section for more information on the
Recommended Sealed Box Volume: The
sealed box sizes recommended by Alpine range from 0.6 cu/ft to 1.25 cu/ft.
Recommended Ported Box Volume:
The ported box sizes recommended by Alpine range from 1.0 cu/ft to 1.75 cu/ft.
No port sizes are listed by the manufacturer.
Frequency Response: The manual
lists the frequency response as "Fs-1kHz" (Fs=Free Air Resonance
frequency). According to Alpine, the actual frequency response is 30Hz-1kHz.
Recommended Enclosures: The
manual only lists the recommended sealed box volume range. The ported box volume
recommendations were obtained directly from Alpine.