At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
Features
Specifications
Features
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 aluminum coated polypropylene inverted
parabolic dust cap, 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.
Screw Cover Gasket: The woofer
includes a rubber gasket to cover the screw holes. When mounted, the gasket adds
approximately 3/16" to the flange height and approximately 1/8" to the
mounting height of the woofer.
Dual 4-ohm Voice Coils: The
SWS-1242D features dual 4-layer voice coils which utilize 180°C
high-temperature wire and a high-strength brass former. Dual voice coil woofers
offer flexibility in wiring. 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.
Spring Posts:
The woofer has two pairs 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
configuration.
Wire Jumpers: The woofer is
equipped with two 5-5/8" speaker wire jumpers with banana plugs on both
ends. These jumpers allow you to wire the voice coils in parallel (for a 2-ohm
load) or series (for an 8-ohm load).
Mirrored Progressive Nomex Spiders: This
subwoofer has mirrored 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.
Leg Vent System: The frame
features an Integrated Leg Vent System to help cool the motor structure. Two
vertical slits are cut into each of the six "legs" of the basket below
the spider to allow cool air to flow in and heated air to flow out.
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.
Specifications
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 2.00 cu/ft.
Within this range, the ideal size recommended by Alpine is 1.5 cu/ft, so this
is the enclosure recommended by Crutchfield. One 4" diameter x 12"
long port should be used with the 1.5 cu/ft enclosure.
