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Alpine S2-A120M (Like New (Open Box))

1200W Class D RMS S-Series Monoblock Car Amplifier

Alpine
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• 600 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• 1200 watts x 1 channel @ 1 ohm
• Total RMS Power: 1200 watts
• Class D 1 ohm Stable Monoblock Amplifier

Learn more about the ls-s2a120m-u9

We apologize

This item has been discontinued

Description


Alpine brand icon

Authorized dealer

Item Condition - Like New (Open Box):

This product works and looks like new. It may have been opened for a visual demo or product video. In some cases there may be signs of an attempt at installation like opened packaging or mounting screw holes used, but there is no real sign of use or wear. Includes all original parts, packaging and accessories (or suitable replacement)

Alpine S2-A120M Mono Amplifier | Features & Specs

About the Alpine S2-A120M

High-Powered Class D Amplification

The Alpine S2-A120M is built for extreme bass performance, delivering high-powered output with Class D efficiency. Whether you're looking to push a single high-performance subwoofer or drive a dual-sub setup, this amplifier provides clean, powerful sound while running cool and efficiently.

Massive Power Output

  • Peak Power: Up to 1200W RMS at
  • Stable at 1Ω to maximize subwoofer output and efficiency
  • Dedicated low-pass filter (50Hz-400Hz) for subwoofer optimization

Compact Yet Powerful Design

The small footprint of the S2-A120M allows for versatile installation, making it easy to fit under seats, in trunks, or alongside other components in a custom system. With a high-efficiency heat management system, this amp stays cool even during long bass-heavy sessions.

Advanced Audio Controls

  • Bass Boost EQ: Adjustable from 0 to +12dB at 50Hz for deep, punchy bass
  • Input Sensitivity: Variable range from 0.2V to 10V for flexible system matching
  • Subsonic Filter: Prevents unnecessary low frequencies from overworking your subs
  • Adjustable Crossover: Selectable 50Hz to 400Hz for precise tuning

Seamless System Compatibility

The Alpine S2-A120M is designed for easy integration, featuring high and low-level inputs to support factory and aftermarket stereos. Whether you're upgrading an OEM system or building a custom audio setup, this amp makes installation hassle-free.

Keep Reading...

Product Details:

  • S Series Class D 1 ohm Stable Monoblock Amplifier
  • RMS Power Rating:
    • 4 ohm: 600 watts x 1 channel
    • 2 ohm: 1200 watts x 1 channel
  • Total RMS power output: 1200 watts
  • Power and voltage LED visual indicator
  • Wired bass level remote control Alpine RUX-KNOB.2 or Alpine RUX-H01 optional
  • Speaker-level (high-level) inputs (Requires adapter like the Kicker KISL)
  • Two-sided Terminal Layout
  • Built-in Selectable / Adjustable Crossovers
  • Signal sensing remote turn-on
  • Damping Factor: >750
  • 1 pair of pre-amp outputs
  • CTA-2006-D Certification
  • Input sensitivity:
    • Low level: 0.2 - 4 volts
    • High level: 0.5 - 10 volts
  • Frequency Response: 10 - 400 Hz
  • Total Harmonic Distortion (THD): 1%
  • Signal to Noise Ratio: >85 dB
  • Variable low-pass filter: 50 - 400 Hz
  • Variable Bass Boost: 0 - 12 dB
  • Fuse Rating: 100
  • 4 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 13.1" L x 8.25" W x 2.25" H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
  • MFR #: S2-A120M

Specifications & Details


Key Features
Amplifier Key Features
Bass Boost
Speaker Level Inputs
Power Specifications - Subwoofer Channel
RMS Power @ 4 ohms
600 watts x 1 channel
RMS Power @ 2 ohms
1200 watts x 1 channel
RMS Power @ 1 ohm
1200 watts x 1 channel
Amplifier Specifications
Series
S Series
Amplifier Class
D
Number of Channels
1 - Mono
Total RMS Power Output
1200 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
1 ohm
Minimum Impedance Bridged
Not Bridgeable
Frequency Response
10 - 400 Hz
THD at Rated RMS Power
1%
Speaker Level Inputs
Optional (Requires Accessory Adapter)
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
Low-Pass Crossover Frequency
50 - 400 Hz
Signal-to-Noise Ratio
>85 dB
Bass Boost
0 - 12 dB
Remote bass/level controller
Optional (Accessory required and sold separately)
Fuse Rating
25A x 4 
Total Fuse Rating
100
Strappable
No
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
Low-Level Input Sensitivity
0.2 - 4 volts
High-Level Input Sensitivity
0.5 - 10 volts
What is in the box?
Paperwork
User manual
Warranty/Registration card
Power certification
WITB: Amplifiers
Amplifier
Mounting screws (4)
Allen wrench
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

S2-A120M-2

Weight:

5.00lbs

Internal SKU:

ls-s2a120m-u9

Internal Product ID:

225139

Customer Ratings & Reviews


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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.