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This Alpine Type-X subwoofer has a carbon fiber, aluminum honeycomb parabolic
cone with a Kevlar-reinforced pulp underside.
HAMRS: The woofer features a
High Amplitude Multi Roll Surround (HAMRS), made of injection molded Santoprene,
that allows for an incredible amount of linear excursion and greater SPL.
Screw Cover Gaskets: The woofer
includes two rubber gaskets to cover the screw holes, one for top mounting and
the other for bottom mounting.
Dual 4-ohm Voice Coils: The
SWX-1242D features dual 4-layer voice coils which utilize 220°C
high-temperature wire with Inner/Outer Winding on a Twin-Wall brass/aluminum 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.
Terminal Block: The speaker
terminals are all located on one side in a machined gold-plated terminal block
with 2.5mm Allen-head set screws (an Allen wrench is included). There are slots
provided for the supplied voice coil jumpers.
Jumpers: The woofer is
equipped with two gold-plated voice coil connection jumpers. 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 twin mirrored progressive Nomex spiders for added stability and mechanical
durability. The custom progressive rolls gives the woofer a longer, more linear
stroke (over 23mm one way) with maximum centering and restoring force. Special edge control design
and Nomex construction provide excellent tear resistance, strength and long-term
reliability. The woofer has dual braided silver tinsel speaker leads that are
woven into the spiders for the one-sided terminal layout.
Cast Aluminum Frame: The
Type-X woofers utilize a custom, one-piece, cast aluminum frame. The unique
design provides the ultimate in voice coil cooling, creating a one-way airflow,
keeping hot air from coming into contact with the voice coil. The frame features
an integrated spider landing and heat transfer plate.
Multi-Stage Ventilation System:
The SWX-1242D has a multi-stage ventilation system with the following features:
- Cone/Voice Coil Junction
Venting: The unique parabolic cone and voice coil attachment piece help
to pull cool air into the motor structure.
- Spider Plateau/Leg Vent System: Two
vertical slits are cut into each of the four "legs" of the basket below
the spider to allow cool air to flow in and heated air to flow out.
- Dual Flare Pole: Optimizes
airflow into the motor structure across the billet copper shorting sleeves
and thermal coupling heat dissipation plate to increase cooling.
Magnet: The woofer is equipped
with triple-stacked strontium magnets with an overall magnet weight of 130
Recommended Sealed Box Volume: The
sealed box sizes recommended by Alpine range from 0.65 cu/ft to 1.25 cu/ft. with an ideal volume of 0.9 cu/ft.
Recommended Vented Box Volume:
The vented box sizes recommended by Alpine range from 1.0 cu/ft to 2.00 cu/ft. with an ideal volume of 1.8 cu/ft. A slot vent, with the dimensions of 13" x 1.5" x 27", is recommended.