Features
Enclosure Compatibility

Features

Dual Voice Coils: For system flexibility, the woofer has two 4Ω voice coils. When the voice coils are wired in parallel, the woofer presents a 2Ω load; when wired in series, the woofer presents an 8Ω load.

HAMR: The woofer features a High Amplitude Multi Roll (HAMR) Surround, made of rubber, that allows a large linear excursion and greater SPL. The HAMR design allows extreme excursions without sacrificing valuable cone area.

Dual Progressive Spider: The dual progressive spiders have integrated tinsel leads to ensure reliable and consistent control of the tinsel leads and eliminate any mechanical noise or interference often seen in high excursion cone designs.

Compound Radius Curve Pole Geometry: Alpine's Patented Compound Radius Curve pole geometry ensures a symmetrical magnetic field, while optimizing flux density to reduce distortion and further improve power handling and output.

Oversized Voice Coil: The oversized (65mm) dual voice coils are wound on an aluminum former.

Terminals: The set screw terminals are all located on one side of the woofer. The terminals will accept bare wire up to 8 gauge.

Jumper Plug: A jumper plug on the terminal block allows you to easily wire the voice coils in parallel (for a 2Ω load) or series (for an 8Ω load).

Enclosure Compatibility

Sealed Box Volume: The recommended sealed box volume ranges from 0.52 ft³ to 0.87 ft³, with 0.67 ft³ being the ideal size. (Most volumes in the manual are given as net, before accounting for the displacement of the subwoofer when installed.)

Ported Box Volume: The recommended ported box volume ranges from 1.18 ft³ to 2.08 ft³. The ideal size is 1.68 ft³, using a slot port measuring 3.75" (Width) x 4" (Height) x 18" (Length), resulting in a tuning frequency of 35 Hz. (Most volumes in the manual are given as net, before accounting for the displacement of the subwoofer and slot port.)