Kevlar Reinforced Cone:
This Alpine Type-S subwoofer has a Parabolic Glass Fiber and 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 Santoprene rubber surround is durable and resistant to
the elements, resulting in 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.
Screw Cover Gasket: The woofer includes a
rubber gasket to cover the screw holes for a clean look. If the gasket isn't
installed, the mounting height is only 0.75 inches.
Dual 2-ohm Voice Coils: The
SWS-1223D features dual 2-layer voice coils which utilize 180°C
high-temperature wire and a glass fiber former. Dual voice coil woofers
offer flexibility in wiring. When
the voice coils are wired in parallel, the woofer presents a 1
ohm mono load. When the voice coils are wired in series, the
woofer presents a 4 ohm mono load. In addition, each coil may be connected to a
different amplifier channel and each channel will see a 2 ohm load.
Spring Posts: The woofer has two pair of spring posts which will accept pin connectors,
banana plugs, and up
to 8 gauge bare wire. All four speaker terminals are located on one side of the
woofer to make it easier to connect the woofer in a parallel or series
Wire Jumpers: The woofer is
equipped with two 3" speaker wire jumpers with banana plugs on both
ends. These jumpers allow you to wire the voice coils in parallel (for a 1-ohm
load) or series (for a 4-ohm load).
Progressive Nomex Spider: This
subwoofer has a progressive Nomex spider for added stability and mechanical
durability. The custom progressive rolls give 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 spider.
Steel Basket: The
high strength custom steel frame is vented around the perimeter for extra
Bumped Back Plate and Extended
Vented Pole Piece: This woofer combines a bumped back plate and an extended
pole piece, giving it a 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.
Sealed Box Volume: The sealed box sizes
recommended by Alpine range from 0.85 cu/ft to 1.5 cu/ft. The ideal recommended
volume is 1.25 cu/ft.
Vented Box Volume: The vented box sizes
recommended by Alpine range from 1.25 cu/ft to 2.0 cu/ft. The ideal recommended
volume is 1.55 cu/ft with a 1" x 12" x 17" (long) slot
The manual also mentions using a bandpass enclosure, but gives no volume
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