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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 performance.
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 0.85 cu/ft to 1.5 cu/ft. Within this range, the
ideal size recommended by Alpine is 1.25 cu/ft, so this is the enclosure
recommended by Crutchfield.
Recommended Vented Box
Volume: The vented box sizes
recommended by Alpine range from 1.25 cu/ft to 2.0 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.