How much power does the R2-A75M put out?

It is rated at 500 watts RMS and 750 watts peak into a single channel. That is enough for most single subwoofers in a daily-driven system.

Does it work with a factory head unit?

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

What is different from the older R-A75M?

The R2-A75M is about 15% smaller and moves the controls to the top under a removable plate. Power ratings stay the same at 500 watts RMS.

Can I add a remote bass knob?

No remote control is included. Bass boost is adjusted at the amplifier, so a dash-mounted level knob is not part of the package.

Can I run more than one amp off it?

Yes. The preamp outputs pass the signal along, so you can feed a second amplifier without splitting cables at the head unit.

The amplifier and its mounting hardware. No remote control or bass knob is included.

What do buyers say about the Alpine R2-A75M R-Series Mono Subwoofer Amplifier?

Rated 5 out of 5 from 3 ratings.

Where can I buy the Alpine R2-A75M R-Series Mono Subwoofer Amplifier?

14 stores we checked sell it, including Pro Audio Center, Best Buy, AVLeaderz, Creative Audio, Crutchfield.

Alpine R2-A75M R-Series Mono Subwoofer Amplifier

Q: Where is the Alpine R2-A75M R-Series Mono Subwoofer Amplifier cheapest?

At Best Buy, for $499.99, 17% under what the other stores charge, as of our latest check.

Best price now

$499.99at Best BuyChecked 9 h ago

17% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when.

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What reviewers say

Owner feedback on the R-Series mono amps is generally positive on output and build, with the compact chassis and top-mounted controls called out as easy to live with. Complaints center on the lack of an included remote level control and on setup taking time.

What people mention

OutputPraisedOwners say it drives a subwoofer with plenty of clean power for its size.
SizePraisedThe smaller chassis is repeatedly noted as easier to fit in tight install spots.
ControlsPraisedThe top-mounted adjustment plate is described as convenient for tuning.
Remote knobCriticisedBuyers miss a remote bass level control, which some rivals include.
SetupMixedGain and crossover adjustment take some time to dial in, owners report.

About the Alpine R2-A75M R-Series Mono Subwoofer Amplifier

The Alpine R2-A75M is a Class D mono subwoofer amplifier from the R-Series. It delivers 500 watts RMS at 4 ohms and 750 watts RMS at 2 ohms. Its footprint is 15% smaller than the previous model, the R-A75M.

All speaker connections are on one side of the amplifier. The gain and crossover controls are on top under a removable plate. The chassis has integrated mounting feet to simplify installation.

It accepts preamp and speaker-level inputs and has preamp outputs. A speaker wire to RCA adapter is required for speaker-level input. An optional RUX-KNOB.2 wired remote level control is available. Wiring and hardware are not included, and 4-gauge power and ground leads are recommended.

Type

Class D mono subwoofer amplifier

Channels

Power at 4 ohms

500 watts RMS x 1

Power at 2 ohms

750 watts RMS x 1

Max power

750 watts

Low-pass filter

Variable, 50-400 Hz, 24 dB/octave

Bass boost