How much power does the S2-A120M make?

It is rated at 600 watts RMS and up to 1200 watts RMS at 2 ohms. That is enough to run one or two subwoofers from a single amp.

Will it work with my factory radio?

Yes. It has speaker-level inputs, so it can take signal from a stock head unit without a separate line-out converter.

Does it include a bass knob?

No. A wired remote for bass level is optional and sold separately.

Can I run two subwoofers on it?

Yes. It is a mono amp, and its output supports multiple subs wired to a compatible final impedance.

What is the difference from the previous S-Series mono amp?

This generation gets a redesigned chassis and upgraded features while keeping the S-Series focus on value. Power and tuning controls are the headline carryovers.

What do buyers say about the Alpine S2-A120M Digital Mono High Power Amplifier?

Rated 4.9 out of 5 from 15 ratings.

Where can I buy the Alpine S2-A120M Digital Mono High Power Amplifier?

21 stores we checked sell it, including Pro Audio Center, AL & ED's Autosound, absoluteusa, Feral Rooster, AbsoluteProMusic.Net.

Alpine S2-A120M Digital Mono High Power Amplifier

Q: Where is the Alpine S2-A120M Digital Mono High Power Amplifier cheapest?

At Amazon, for $495.99, as of our latest check.

Best price now

$495.99at AmazonChecked 8 h ago

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What reviewers say

4.9 / 515 ratings

Owners give it a 4.9 average and describe strong, clean bass for the money. Most praise the power output and the tuning controls; the main gripes are the missing remote and the amp's size.

What people mention

Power outputPraisedOwners say it drives subs hard and matches its RMS ratings.
Bass tuningPraisedThe variable bass boost and low-pass filter are called easy to dial in.
InstallationMixedSpeaker-level inputs simplify factory-radio installs, but the long chassis limits where it fits.
RemoteCriticisedBuyers note the wired bass level remote is an extra purchase.
NoiseMixedThe 85 dB signal-to-noise ratio is seen as adequate rather than exceptional.

About the Alpine S2-A120M Digital Mono High Power Amplifier

The Alpine S2-A120M is a Class D mono amplifier from the S-Series, built to power a subwoofer in a car. It is rated at 1200 watts RMS into 1 or 2 ohms and 600 watts RMS into 4 ohms, and it can be bridged. That output allows it to run multiple subs from one amplifier.

A variable low-pass crossover sets which frequencies reach the sub, and a variable bass boost adds up to 12 dB of extra low-end punch. An optional RUX-KNOB2 wired remote bass control adds control of bass level from the front seat. The remote is not included.

The amp has both preamp and speaker-level inputs, so it can be installed with a factory radio. On the speaker-level inputs it senses the incoming signal and turns on automatically, with no separate turn-on wire. It has two-sided screw terminals for speaker and power cables, with terminal covers included.

Amplifier class

Class D (digital), mono

RMS power

1 x 1200 W at 1 ohm; 1 x 1200 W at 2 ohms; 1 x 600 W at 4 ohms (14.4 V, ≤1% THD+N)

Max power

1200 watts

Bridgeable

Yes

Crossover

Variable low-pass filter, 50-400 Hz, -24 dB/octave

Bass boost

Variable Bass EQ, up to +12 dB