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Alpine PDR-F50

4-channel car amplifier — 85 watts RMS x 4

Item #: 500PDRF50

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6 Reviews | Ask Questions

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Concentrated power

Alpine managed to pack more power per square inch into their PDR-F50 4-channel Power Density Reference amplifier than almost any other amp in its class. The PDR-F50 can put out 85 watts RMS per channel, giving extra clarity and volume to your full-range speakers, and it'll fit in almost any of the tiny spaces you find in many cars and trucks these days. You can also use this versatile amp in 3-channel mode, driving your speakers with the front channels, and bridging the rear channels to send up to 250 watts RMS to your sub.

Tone control

Alpine included the tone controls you'll need to fine-tune your system so your speakers sound their best. You can use the high-pass filters to remove the extreme low bass from your full-range speakers, so they'll play more efficiently. If you plan on running subwoofers with your PDR-F50, you can adjust the low-pass filters and bass boost to get just the right bass tone.

Superior sound and build quality

Alpine built the PDR-F50 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-F50.

Alpine PDR-F50

PDR-F50 control panel exposed

Product Highlights:

  • 4-channel car amplifier
  • 85 watts RMS x 4 at 4 ohms (125 watts RMS x 4 at 2 ohms)
  • 250 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • separate variable high- and low-pass filters (50-400 Hz, 12 dB/octave) on front and rear channels
  • selectable bass boost (0, 6, or 12 dB at 50 Hz) on rear channels
  • preamp and speaker-level inputs
  • speaker-level inputs require RCA adapter cables
  • Class-D amplifier design
  • MOSFET power and output stages
  • fuse rating: 30A 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-F50 Reviews

Average Customer Review:

6 Reviews

Lots of power

Written by: Rolex from Dallas Tx on January 31, 2016

Crutchfield Customer Review (What's this?)

The best of the best nice size so small but with a lot of power thanks Crutchfield

Pros: Small and lots of power

Cons: None

Great clean power

Written by: Jason T from Christiansburg,Virginia on June 1, 2015

Crutchfield Customer Review (What's this?)

I got just what I expected from Alpine and Crutchfield. A amp that was thoroughly rated and described by Crutchfield which Alpine always delivers. I run this to my component speakers in my Jeep wrangler and they give them all of the push that they require. The amp runs cool and doesn't clip. Great product.

Pros: Size, looks, power consumption efficiency,

Cons: None

Big Sound for the Size

Written by: ChrisD from Seattle, WA on March 25, 2015

Installed three previous amplifiers in a variety of different cars, but I had to get creative with the space under the rear bench in my 96 Grand Cherokee. Fits in the same location as the OEM Infinity Gold Amp without any difficulty length wise. Width is a tad tight, but it's just enough to remain on level ground.

Doesn't run hot at all and have had no experience of distortion regardless of music (rock, rap, etc). Very slight distortions at the highest volume levels, but I'm just being picky at this point. Very impressive amplifier for the price!!

Install was not a problem, was able to conceal wiring under carpet through pre-exisitng wire channels.

Pros: Stays cool Compact for variety of install locations Install is rather straight forward

Cons: Very slight distortion at highest volume levels

Alpine PDR-F50

Written by: Orange Street Boy from Makaha Valley, Hawaii on March 8, 2015

Crutchfield Customer Review (What's this?)

Awesome Amp! Powers Up My 3 Sets Of Speakers And When Played Loud There's No Distortion Or That Sort Of Thing. The Amp Doesn't Get As Hot As Most Amps Would. Which Means It'll Last Longer.

Pros: Does Run As Hot You Would Think. Small So You Can Tuck It Away.

Cons: Have Yet To Discover 1.

An Unmitigated Wow

Written by: Drew from Fredericksburg, VA on March 7, 2015

Installed in my 2000 Corvette and I'm extremely satisfied. The installers also did a great job

Pros: Everything

Cons: None

Very Impressed

Written by: G from Alabama on April 1, 2014

Crutchfield Customer Review (What's this?)

I installed this amp in my camaro to replace the boston acoustic amp. I am very impressed with the stereo separation, very tight controlled bass and detail highs that this amp delivers. It is very efficent and cool running also. This amp packs a big punch for the money. I've had higher dollar amps but not to deliver the clarity that this one does. I can't express enough on the tight bass it delivers. Alpine did a great job on this one.

Pros: The gain controls and crossover are very accessible. Very Powerful, quiet and cost effective for what you get!

Cons: Cannot think of any.

Hands-on research

What's in the box?

Download owner's manual

  • 4-Channel class-D amplifier
  • Two 30-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



Channel Design: The Alpine PDR-F50 can be configured as a 4-channel, 3-channel, or 2-channel amplifier. The amplifier is stable to 2-ohms in stereo, 4-ohms when bridged.

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-F50 is rated at 85 watts RMS x 4 channels with an 87 dBA signal to noise ratio. The signal to noise ratio at the rated power output (not CEA-2006 conditions) is 106 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: There are independent rotary gain controls for the channel-1/2 and channel-3/4 amplifier sections. The gain settings are continuously variable from 0.2 to 4.0 volts.

Crossover: The amp has independent crossover mode and frequency controls for channels-1/2 and 3/4:

  • Mode: choose off (crossover is bypassed), high pass, or low pass
  • Frequency: rotary dial; 50-400 Hz

Input: The two position input switch configures the inputs:

  • 1/2: only inputs 1/2 are used, and are shorted to channels 3/4
  • 3/4: all four RCA inputs are used

Bass Boost: The bass boost circuit provides +6 dB or +12 dB signal boost centered at 50 Hz to channels-3/4. The bass boost can also be turned off.


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: The four pair of speaker outputs set-screw terminals will accept up to 12-gauge wire. The set screws are tightened/loosened with the included 2mm Allen wrench.

Signal Input: The Alpine PDR-F50 is equipped with two pair of female RCA jack inputs; Channel-1/2 and Channel-3/4.

Fuses: The amp is protected with two 30-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.

Customer Q&A