Features
Specifications

Features

Cone Materials: 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 ounces.

Specifications

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.