Dual Voice Coils: For increased
system flexibility, the woofer has two 4 ohm voice coils. When the voice coils
are wired in parallel with each other, the woofer presents a 2 ohm mono load.
When the voice coils are wired in series with each other, the woofer presents an
8 ohm mono load. In addition, each coil may be connected to a different
amplifier channel and each channel will see a 4 ohm load.
Kevlar Reinforced Pulp Cone:
This Alpine Type-S 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.
Heavy Gauge Steel Basket: The
frame is custom stamped from heavy gauge steel for maximum strength.
Heat Transfer Plate: This
subwoofer contains a heat transfer plate that is thermally coupled to the voice
coil. This plate pulls heat away from the voice coil, achieving up to 10%
additional power handling, and better reliability.
Bumped Back Plate and Extended
Vented Pole Piece: This woofer combines a bumped back plate and an extended
pole piece, giving it a nearly 2" peak-to-peak cone excursion. This extra
long cone movement provides a higher bass output. The vents and dual flared design of the pole piece
maximize airflow around the voice coil, giving it a more reliable
The woofer has two pairs of spring posts which will accept pin connectors and up
to 8 gauge bare wire.
Power Handling: This woofer has
a total RMS power rating of 200 watts and a total peak power rating of 600
watts. Each voice coil carries an RMS power rating of 100 watts and a peak power
rating of 300 watts.
Recommended Sealed Box Volume: The
sealed box sizes recommended by Alpine range from 0.65 cu/ft to 1.25 cu/ft.
Within this range, the ideal size recommended by Alpine is 1.0 cu/ft, so this is
the enclosure recommended by Crutchfield.
Recommended Vented Box Volume:
The vented 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
Recommended Enclosures: The
manual only lists the recommended sealed box volume range. The vented box volume
recommendations were obtained directly from Alpine.