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Alpine PDR-M65

Mono subwoofer amplifier — 650 watts RMS x 1 at 2 ohms

Item #: 500PDRM65

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1 Review | 1 question - 1 answer

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Concentrated power

Alpine managed to pack more power per square inch into their PDR-M65 mono Power Density Reference amplifier than almost any other amp in its class. The  PDR-M65 can put out up to 650 watts RMS, giving solid punch and definition to your bass, and it'll fit in almost any of the tiny spaces you find in many cars and trucks these days. You can adjust the amp's low-pass filter and bass boost to get just the right bass tone, and you can add the optional RUX-KNOB remote bass knob to control your bass from the dash.

Superior sound and build quality

Alpine built the PDR-M65 to exacting physical and electronic standards, resulting in a tough, powerful amp with an incredibly clean and noise-free output. All the electrical connections are made on one side, for more convenient and neat installations. Speaker-level inputs allow you to use this amp in almost any system, even one with a factory radio. And you can rotate the badge, so the Alpine logo can always display right side up no matter which way you mount your PDR-M65. You can control the volume of your MRV-M500 from the front seat with the optional RUX-KNOB remote bass controller.

Alpine PDR-M65

PDR-M65 control panel exposed

Product Highlights:

  • mono subwoofer amplifier
  • 450 watts RMS x 1 at 4 ohms (650 watts RMS x 1 at 2 ohms)
  • CEA-2006 compliant
  • variable low-pass filter (50-400 Hz, 24 dB/octave)
  • variable bass boost (0-12 dB at 50 Hz)
  • variable subsonic filter (min-40 Hz, 24 dB/octave)
  • optional remote level control (RUX-KNOB)
  • Class D amp with MOSFET power supply
  • preamp inputs and outputs
  • speaker-level inputs — require RCA adapter cables
  • fuse rating: 35A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 9"W x 2-1/16"H x 7-1/8"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 PDR-M65 Reviews

Average Customer Review:

1 Review

Couldn't be happier

Written by: Greg T. from Fort Leavenworth, KS on May 29, 2015

Crutchfield Customer Review (What's this?)

I wanted a little more thump in my 2010 Ranger and I got way more than I bargained for. This Alpine amp pushes major power to the two 10 inch Alpine subwoofers I have and I get nothing but extremely low bass which is hard hitting and I love it.

Pros: Definitely gives the power needed to push the subs

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Mono class-D subwoofer amplifier
  • Two 35-amp ATO fuses (installed)
  • Four 3/4" Self-tapping screws
  • 3mm Allen wrench
  • 2mm Allen wrench
  • Alpine logo plate
  • Owner's manual (English/ French/ Spanish)
  • Verification certificate
  • Warranty information
  • On-line registration information

Product Research



CEA-2006 Compliant: CEA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4Ω load, with 1% or less Total Harmonic Distortion plus noise (THD+N), and over a frequency range of 20 Hz to 20 kHz (for full range amplifiers). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 standards allow consumers to compare car amplifiers and receivers under the same conditions (apples to apples). Using CEA-2006 criteria, the Alpine PDR-M65 is rated at 450 watts RMS x 1 channel with an 87 dBA signal to noise ratio. The signal to noise ratio at the rated power output (not CEA-2006 conditions) is 113 dB.

LED: The top mounted LED Power indicator glows blue when the amplifier is turned on and changes to red when the protection circuit is engaged.

Speaker Level Inputs: The RCA inputs will accept either speaker-level or line level signals from your car's head unit. A speaker level signal is connected to the RCA inputs using a speaker wire to RCA adapter (sold separately).

Auto Turn-on: When using a speaker level input, the amp will turn on automatically when it senses the input signal.

Verification Certificate: The amplifier comes with a certificate that lists the RMS power output of the specific amplifier. It also lists the model number, serial number, test date, and the test conditions (14.4 volts, 2 ohms).


Hidden Controls: The amplifier's controls are hidden under a cover plate. The plate is removed by unscrewing two machine screws with the supplied 2mm Allen wrench.

Gain control: The gain setting is continuously variable from 0.2 to 4.0 volts.

Low Pass Crossover: The built-in 24 dB/octave low pass filter's crossover point is variable from 50 to 400 Hz. Because this is a subwoofer amp, the crossover is always engaged.

Subsonic Filter: The 24 dB/octave Infrasonic Filter removes ultra-low frequencies that cannot be reproduced by most subwoofers. These frequencies do not become sound, but unnecessary oscillations which affect sound by causing distortion. These frequencies also waste amplifier power and can cause damage to speakers. The filter's crossover point is variable from 8 to 40 Hz.

Bass EQ: The bass boost circuit, centered at 50 Hz, is variable from 0 dB and +12 dB.


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

Power Input: Two set-screw terminals are provided for connecting the power and ground cables. The terminals accept up to 4-gauge wire (a 4-gauge wiring kit is recommended). The set screws are tightened/loosened with the included 3mm Allen wrench.

Remote Turn-on: The remote turn-on set screw terminal will accept up to 12-gauge wire. The set screw is tightened/loosened with the included 2mm Allen wrench.

Speaker Outputs: There are two pair of set-screw speaker output terminals; they are internally wired in parallel, making it easy to connect two subwoofers. The terminals will accept up to 8-gauge wire and are tightened/loosened with the included 3mm Allen wrench.

Signal Input: The Alpine PDR-M65 is equipped with a pair of female RCA jack inputs.

Line Level Output: The amplifier has a pair of RCA line level outputs for feeding another amplifier (4V max); it is the same signal that is input through the RCA line inputs. The amplifier's crossovers have no effect on the line level output signal.

Fuses: The amp is protected with two 35-amp ATO fuses.

Wired Remote (optional): Alpine's wired remote control (item number 500RUXKNOB, sold separately) plugs into the RJ-25 Remote Bass Control terminal, giving you attenuation control of the sub(s) from anywhere in the car (0 to -20 dB).

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.

Customer Q&A

1 question already asked

I forwarded your question to an Advisor and they responded with the following: You will wire the two subwoofers to their own set of outputs as they are conveniently wired in parallel, see here: Speaker Outputs: There are two pair of set-screw speaker output terminals; they are internally wired in parallel, making it easy to connect two subwoofers. The terminals will accept up to 8-gauge wire and are tightened/loosened with the included 3mm Allen wrench. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Mar 10, 2015 ]  Staff