Alpine PDX-M12

Mono subwoofer amplifier — 1200 watts RMS x 1 at 2 ohms

Item #: 500PDXM12

In Stock

3 Reviews

Your price: $849.99 Earn up to 850 Rewards points

Add to Cart

+ Add to wishlist + Email me alerts for this product

View all associated offers

Alpine Authorized Online Dealer

Alpine packs Class-D amplifier technology into their PDX amplifiers for awesome power from a 2" tall frame. These small-but-mighty amps run so cool they can be stacked together into a single unit — their heatsinks couple together to cool the entire stack. Each amp offers an 8" by 10" footprint, so they'll fit in hatchbacks, trunks, truck cabs, and any vehicles with limited space.

Mono powerhouse

Winner of a 2010 Innovations Award, the PDX-M12 mono amplifier supplies a stunning 1,200 watts of sub-cranking power from its amazingly compact body. Beefy internal components and clever engineering keep the power output strong and the noise low for superb fidelity and control. The adjustable low-pass filter tailors the amp's output to your specific system.

Front-mounted controls and pop-out connectors

Front-mounted controls make post-installation adjustments a snap, even when multiple amps are stacked together. Nifty removable speaker and power wire plugs make it easy to install or remove an amp, while ensuring a tight connection and guaranteeing that your speakers work in unison. Gold-plated RCA inputs, outputs, and power connections resist corrosion and signal degradation.

You can control the volume of your MRV-M500 from the front seat with the optional RUX-KNOB remote bass controller.

Note: Sorry, Crutchfield cannot ship Alpine products to Guam or Puerto Rico.

Product Highlights:

  • mono subwoofer amplifier
  • 1,200 watts RMS x 1 at 4 ohms (1,200 watts RMS x 1 at 2 ohms)
  • variable low-pass filter (50-400 Hz, 24 dB/octave)
  • selectable subsonic filter (off, 15 Hz, 30 Hz)
  • Class-D amplifier design
  • stackable installation design with front-panel controls
  • quick-connect speaker connectors
  • preamp-level inputs and outputs
  • MOSFET power and output stages
  • CEA-2006 compliant
  • optional RUX-KNOB wired remote level control
  • fuse rating: 25A x 4
  • 4-gauge amp wiring kit with 100-amp fuse recommended — wiring and hardware not included with amplifier
  • 10-1/8"W x 2"H x 8-5/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Alpine PDX-M12 Reviews

Average Customer Review:

3 reviews
Review this product
Great Gear Giveaway

Submit a review and then enter to win a $350 rewards card


Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left


Written By jay, mesa Az on Tuesday, December 25, 2012

Crutchfield Customer Review (What's this?)

This amp was easy to install and pushes my two 12 inch type Rs like a champ. The sound is pure bliss

Pros: Easy to install and small enough to give me more options for mounting

Cons: Must be vary careful when removing the top access

Lots of Power Tiny Package

Written By kyle140, Scotland, Ontario, Canada on Tuesday, July 05, 2011

Go this bad boy paired up with a Kenwood KNX7180 and a 15" woofer in a custom to spec ported box, and this thing puts out way more power than my old PDX1.1000 put down. Compared to the last gen PDX this thing is a heck of a lot more efficent (Same max current draw with 200w more RMS guaranteed on TAP)

Only feature i find truly lacking with this amp is the variable SSF (More options than just off 15hz and 30hz)

alpine pdx m-12

Written By gotspl, ontario, Canada on Wednesday, April 21, 2010

hey all i just got this amp today and my first impression was wow this thing is sleek and looks awesome, i was even happier when i pulled out the birth certificate and it said 1391rms! i have this amp pushing 2 15" alpine type r's, now that i have it all tuned up it pounds so much hard then my old amp (kicker zx 1000.1). this amp does get a litte toasty, but nothing to get worried about, i love the size. if i could find something to complain about it would be that it does not have built in bass booster like my kicker did. but overall i'd say very nice amp, and make sure you have big enough electrical system to power it. i have 2 power cells as well as my battery up front and the big three done under the hood (all 0 gauge wire)and i couldn't be any happier, definitely worth the money.

Hands-on research

What's in the box?

Download owner's manual

  • Monoblock class-D amplifier (with four 25A ATO fuses inserted in chassis)
  • Battery connector plug
  • Speaker connector plug
  • 2 Stacking plates
  • Four M3 x 7mm machine screws
  • Four M4 x 24mm machine screws
  • Four M4 x 36mm self-tapping screws
  • 2 Hex-keys (Small/Large)
  • Owner's Manual (Eng/Fre/Spa)
  • Verification Certificate
  • Limited Warranty Card
  • Customer Care Registration Card

Product Research



PDX Amplifier Design: Class-D amplifiers boast higher efficiency, produce much less heat, and draw less current than traditional Class-AB amps. The PDX series is Alpine's super-efficient power density design of full-range and monoblock class-D amps. They combine MOSFET power supplies, MOSFET final outputs, and a thermal management processor, along with a 6-Layer Glass Epoxy PC Board to create a high-end sound quality without the bulky heat sinks required by most amps with this much power.

STAR Topology: Alpine's unique STAR (Signal Transit for Accurate Response) Circuit PCB design provides a single common ground for all amp sub-blocks, preventing ground interference and minimizing internal noise.

Power Management Processor: The Alpine PDX amplifier incorporates Alpine's new Power Management circuit. The Power Management Processor controls all aspects of amplifier performance, monitoring voltage, temperature and output to ensure uninterrupted power output for non-stop listening.

Uninterrupted Protection Circuits: If the amplifier gets too hot, the Thermal Protection circuit kicks in and gradually decreases output power until it cools down. Once cool, the power output automatically increases back to the previous level. If the circuit detects a Low Battery condition, it will gradually decrease power output if battery voltage becomes too low. Once the battery voltage increases, power will be restored. This interruption-free design allows for non-stop enjoyment with no hiccups or drop-outs, just clean, clear output.

Monoblock Design: The Alpine PDX-M12 is a monoblock subwoofer amplifier designed specifically to handle low frequencies between 5 and 400 Hz.

Low Impedance Stability: This amp is stable at low impedances and is capable of its rated power (1200-watts x 1-channel) from 2 to 4 ohms. This allows excellent flexibility with multiple speaker and subwoofer loads and is adjusted automatically.

CEA 2006 Compliant: The PDX-M12's power ratings are measured according to the strict standards dictated by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even if they come from different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging.

  • 4-ohm Load: 1200 watts x 1-channel in 4-ohms @ 20 to 400 Hz with 1% THD+N
  • 2-ohm Load: 1200 watts x 1-channel in 2-ohms @ 20 to 400 Hz with 1% THD+N

Verification Certificate: The amplifier comes with a certificate that lists the RMS power output of the individual amplifier. It also lists the model number, serial number, test date, and the test conditions (14.4 volts, 4 ohms).

Ultra-Wide Frequency Response: The Alpine PDX-M12 offers a super-wide, frequency range (5-400Hz) for unparallel sound quality and detail.

Ultra-Low Output Impedance: With ultra-low output impedance, the PDX-M12 offers extremely controlled, tight bass for unprecedented sound quality. The amplifier's Damping Factor is rated at >1,000.

High Signal-to-Noise: This amplifier is capable of S/N ratios up to 92dB S/N @ 1W, 123dB S/N at rated power for extremely clean, uncolored sound. The PDX amp delivers crystal clear music every time, without unwanted background noise or static.

Beefy Power Supply: The PDX amplifier's power supply delivers tremendous headroom with low distortion and noise. The PDX amplifier has an extremely high total system efficiency of ~80% (power supply is rated at >90%, output stage is rated >90%).

Stackable: The PDX series amplifiers are 20% thinner than previous models at only 2" thick. A newly designed stacking system packs the amps closer together so there are no gaps and to save space in the trunk while directly coupling the amps heatsinks to help share cooling duties.

Notes: When stacking multiple amplifiers, do not install vertically or at an incline. Any stack installation other than parallel to the vehicle floor, invalidates the warranty.

LED: The top mounted LED Power indicator glows blue when the amplifier is turned on.


Hidden Controls: The Alpine PDX amplifier's controls are hidden behind a decorative front-panel. The front-panel is removed by unscrewing one machine screw with the supplied hex key and then prying the front panel open.

Gain Control: The PDX-M12 provides independent rotary controls for the front and rear channels to set the amplifier's gain according to the level of the incoming signal. The gain settings is continuously variable from 0.1V to 8.0V.

Subsonic Filter: Also called an infrasonic filter, a subsonic filter cuts off extremely low bass (below the range of human hearing) that many speakers cannot effectively reproduce, thereby making the amp's power supply and output devices, and the speaker, more efficient. The subsonic filter can either be set to 30Hz, 15Hz or Off.

Low Pass Filter: The amplifier features a built-in Low Pass Filter with a rotary, variable adjustment knob which permits adjustment of the crossover frequency, by rotating the knob to select any frequency between 50 to 400 Hz (-24 dB/oct) as the crossover point.

Wired Remote (optional): Simply add Alpine's wired remote control (500RUXKNOB, sold separately), and get full control from the front of your vehicle for remote bass adjustments. You also have the ability to control multiple amps from just one controller with simple telephone cord adapters (also sold separately).


Terminal Layout: For wiring convenience, all of the inputs and outputs on the amplifier are on one side.

Quick Connect Plugs: The PDX series amplifier uses quick connect plugs to attach your system's speaker wires and power cables to the amp for a simple, error-free installation.

Quick Connect Speaker Terminals: The Alpine PDX-M12 includes a quick connect high-power speaker terminal. Bare speaker wire, up to 8 gauge, is held in place by two screw-clamps on the quick connector. The speaker terminal quick connector then plugs into the amplifier.

Quick Connect Battery Terminals: The removable battery terminal quick connector features a low-loss, high-current design. It accepts up to 4GA wire for power and ground, to ensure your amp gets the power it needs while allowing for easy installation. The remote-turn on lead will accept up 12 gauge wire. The power, ground, and remote-turn on lead are secured by set-screws on quick connector. The battery terminal quick connector then plugs into the amplifier.

Line Level Input: The Alpine PDX-M12 is equipped with two gold-plated female RCA jacks.

Line Level Output: In addition to the line inputs, the PDX-M12 has non-fading left and right female RCA outputs for extra system flexibility, so you can daisy chain a second PDX monoblock amplifier.

Fuses: The Alpine PDX-M12 is equipped with four 25-amp ATO fuses.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.