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The Alpine ALPINE-PACK439A-AMP is a comprehensive car audio package designed to deliver powerful bass and an enhanced listening experience. This bundle includes the Alpine S-W12D4 12-inch subwoofer, known for its 600W RMS power handling and durable Pulp/Kevlar cone with an advanced High Amplitude Multi-Roll (HAMR) surround. It's housed within a specifically designed rear-fire sealed subwoofer enclosure constructed from 5/8" MDF, engineered to produce tight, accurate bass. Complementing the subwoofer is the Alpine S2-A60M Class D mono amplifier, capable of delivering up to 600W RMS of power at 2 ohms. This amplifier features an improved heat sink and protection circuit to ensure consistent, dependable playback by preventing thermal shut-down. The package also includes the Harmony Audio HA-AK4 complete 4-gauge amplifier installation kit, providing 17 feet of 4-gauge power cable, speaker wire, RCA cables, a remote turn-on wire, and a 150-amp ANL fuse holder for a straightforward setup. Key specifications for the Alpine S-W12D4 subwoofer include a frequency response of 26-200Hz and a sensitivity of 86.4dB, with a recommended power range of 250-600W RMS. The enclosure offers 0.90 cubic feet of air space and dimensions of 15-1/2" W x 13" H x 10-1/4" D (front) / 12-3/4" D (rear). The S2-A60M amplifier operates efficiently with its Class D design, offering 400W RMS x 1 at 4 ohms and 1200W peak power at 4 ohms. This product is exclusively available for shipping within the USA and its territories. Additionally, a remote bass knob (RUX-KNOB.2) is compatible but sold separately, allowing for on-the-fly adjustments to your subwoofer's output.