Alpine S2-A120M 1200W Mono Class D Car Amplifier – 1 Ohm Stable Subwoofer Amp

Alpine S2-A120M 1200W Mono Class D Amplifier

The Alpine S2-A120M is a high-performance 1200-watt mono power amplifier engineered to deliver clean, efficient, and reliable bass output for your subwoofer system. Built with Alpine’s advanced Class D amplifier circuit, this compact powerhouse produces impressive output while maintaining exceptional efficiency and thermal control.

Key Features

• 1200W Mono Power Amplifier
• Alpine Class D Amplifier Circuit for high efficiency and low heat
• Two-Sided Terminal Layout for easier, cleaner installation
• Built-in Selectable & Adjustable Crossovers
• Optional Remote Bass Knob Compatible (requires RUX-KNOB.2 or RUX-H01, sold separately)

Power & Performance

• 600W x 1 @ 4Ω
• 1200W x 1 @ 2Ω
• 1200W x 1 @ 1Ω
• Signal-to-Noise Ratio: >85dB
• Frequency Response: 20Hz – 400Hz
• Damping Factor: >750
• Power Rating: 14.4V, < 0.1% THD + N

Designed for serious bass enthusiasts, the S2-A120M offers flexible impedance handling down to 1 ohm, making it ideal for a wide range of subwoofer configurations. Its high damping factor ensures tight, controlled low-frequency performance, while the adjustable crossover allows precise system tuning.

Compact & Installation-Friendly

• Dimensions: 13.1” W x 2.25” H x 8.25” D
• Weight: 8 lbs, 11 oz
• Two-sided terminal layout for improved wire management

What’s in the Box

• (1) S2-A120M Mono Amplifier
• (2) Connection end covers with 4 attachment screws
• (4) Self-tapping screws
• (1) Hexagon wrench
• Owner’s Manual
• “Birth Sheet” certifying measured amplifier power
• Alpine Registration Card
• Alpine Limited Warranty Sheet
• Power supply wire connection tips sheet

Whether you're upgrading an existing system or building a powerful subwoofer setup from scratch, the Alpine S2-A120M delivers dependable power, installation flexibility, and the legendary performance Alpine is known for.