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Alpine PDX-F6

4-channel car amplifier — 150 watts RMS x 4

11 Reviews | 3 questions - 4 answers


Our take on the Alpine PDX-F6

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.

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.

4-channel powerhouse
The PDX-F6 4-channel amplifier delivers 150 watts per channel to your speaker system from its amazingly compact body. You can also switch to 2-channel mode, and drive a couple of subs with 300 watts each. 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.

Product Highlights:

  • 4-channel car amplifier
  • 150 watts RMS x 4 at 4 ohms (150 watts RMS x 4 at 2 ohms)
  • 300 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • variable high- and low-pass filters (30-400 Hz, 12 dB/octave)
  • Class-D amplifier design
  • stackable installation design with front-panel controls
  • quick-connect speaker and power connectors
  • preamp-level inputs
  • MOSFET power and output stages
  • CEA-2006 compliant
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-1/8"W x 2"H x 8-9/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • 4-Channel class-D amplifier (with two 30A ATO fuses inserted in chassis)
  • Battery connector plug
  • 4 Speaker connector plugs
  • 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

Sound is clean and strong. Huge upgrade over previous 4-channel amp. I would definitely recommend this amp.

Steven E., Hummelstown, PA


Alpine PDX-F6 Reviews

Average Customer Review(s):

(11 Reviews)

Great amp

Steven E. from Hummelstown, PA on 5/29/2018

Crutchfield Customer Review (What's this?)

Sound is clean and strong. Huge upgrade over previous 4-channel amp. I would definitely recommend this amp.

Pros: Powerful and clean sound in a small package.

Cons: None

UNBELIEVABLE Quality and Clarity!!

Thomas from Greenville, SC on 11/14/2017

Crutchfield Customer Review (What's this?)

I am very much into quality. That is why I have been using Alpine head units and amps for over 20 years. So when my head unit went bad, I decided to upgrade my whole system. I went with the new Alpine CDE-163BT for its FLAC feature. Now I don't need anymore CD's! I combined it with this PDX-F6 amp and a single pair of Morel Virtus 602 in the front. To avoid clipping, I left the amp gain at 0, but boosted the head unit's USB to 10db. I am using only the front speakers with 150w so I using only half of the amp. I am also running a separate sub on a different amp. Bottom line: I have never heard music SO GOOD! Even at the highest volume that I can stand, the music is absolutely crystal clear. It is so fun listening to older music and hearing things I never heard with such awesome imaging! This class D amp sounds so much better than Alpines class A amp (MRX-F35 bridged). I thought class D would sound tinny, but this one doesn't. At 54, I actually thought I was loosing some of my hearing, but I realized I just needed new equipment. This amp + Morel Virtus = PERFECTION!

Pros: Crystal Clear, Very loud with just 150w, easy hookup


Alpine PDX-F6

Robert from Tennessee on 11/3/2017

Crutchfield Customer Review (What's this?)

NO REGRETS ! This powerhouse is extremely clean , clear , and strong ! I won't ever change to any other amp or brand , this amp exceeds my wildest expectations !

Pros: Awesome sound !

Cons: None

Alpine PDX-F6

Vince from Minster, OH on 4/16/2017

Crutchfield Customer Review (What's this?)

very good powerful 4 channel amp. Neat and compact.



Alpine PDX-F6

Crutchfield customer from Ontario, Or on 1/13/2017

Crutchfield Customer Review (What's this?)

Good strong amp, clean and loud..



Alpine PDX-F6 Review

Andrew from Hammond, IN on 7/11/2016

Crutchfield Customer Review (What's this?)

What an incredibly clean sound. I am old school, and some of the old songs don't sound quite the same. This product and the receiver are my first Alpine products, and I am very pleased.

Pros: Incredible sound quality.

Cons: None

Alpine PDX-F6

Guest from tampa, fl on 2/9/2015

Always get my products in time and the quality is good



well worth the price.

heywood jablowme from Dallas, Pa. on 7/14/2013

Crutchfield Customer Review (What's this?)

i installed this amp 4 months ago and i have to say i am so glad i picked this amp. i had a few others but none made my music scream with the clean, clear power this baby has. says 150x4 mine birth certificated at 189x4. i'm an old 60-70's rock n roller. who knew pink floyd could sound so good.... just rocks the doors off my dodge quad cab. latest in a long line of outstanding alpine products.

Pros: so simple to hook up and adjust to your tastes. will make your ears bleed on the highs, clear tones on the mids, and thumping driver on the bottoms.

Cons: none.

Very Powerful Amp

Jon from Omaha, NE on 1/9/2013

Crutchfield Customer Review (What's this?)

I upgraded from the Alpine PDX-V9 because I was looking for a little extra volume and detail from my speakers. The PDX-F6 delivered. I'm getting a lot more volume and a lot less distortion from my speakers. For example, tracks from Johnny Cash would often make my midrange driver distort at moderate volume levels. This is no longer a problem. I was very skeptical of these new Class D amps but I will continue to buy Class D for car audio. It just makes sense. My last system was powered by a JL Audio 500/5 and I would say that PDX amps sound just as good. I'm running JBL MS-62C's in my front and rear doors.

Pros: Small size and powerful.

Cons: None so far.

Expensive, But Cheap For What It Is Capable Of!

Submerse from Bozeman, MT on 1/21/2011

In my car I had a BIG ground loop problem when I had a Rockford Fosgate amp. It doesn't matter what was done (change the grounds to the amp and head unit, replace the amp, replace the head unit), not one dealer could figure the problem out. I traded my CDA-117 for the 9887 (amazing! get it if you can find it!) from Alpine and that made the ground loop clearer, but it did not take the problem away. The thing that took the sound away was this amp. It actually has a power conditioner in it! I recommend this amp! But don't rely on this to cover up the problem, make sure you check everything first... since ground loops can be a big problem. Anyway, the amp I got was rated for 30-40 plus watts more than what it states! I make music so I needed something that was amazing. I found it! And yes, Alpine needs better speakers. Not better amps.



Great Amp

Jae from Honolulu, HI on 12/4/2010

Popped my SPX-17PRO tweets with it. Alpine needs better speakers...




Hands-on research

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.

Channel Design: The Alpine PDX-F6 can be configured as a 4-channel, 3-channel, or 2-channel amplifier. The amplifier is stable down to 2-ohms in stereo, and 4-ohms when bridged.

Low Impedance Stability: This amp is stable at low impedances and is capable of its rated power (150-watts x 4-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-F6'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.

  • Four-Channel (4-ohm): 150 watts x 4-channel in 4-ohms @ 20 to 20,000 Hz with 1% THD+N
  • Four-Channel (2-ohm): 150 watts x 4-channel in 2-ohms @ 20 to 20,000 Hz with 1% THD+N
  • Bridged (4-ohm): 300 watts x 2-channel in 4-ohms @ 20 to 20,000 Hz with 1%

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-F6 offers a super-wide, frequency range (5Hz-100kHz) for unparallel sound quality and detail.

Ultra-Low Output Impedance: With ultra-low output impedance, the PDX-F6 offers extremely controlled, tight bass for unprecedented sound quality. The amplifier's Damping Factor is rated at >500.

High Signal-to-Noise: This amplifier is capable of S/N ratios up to 96dB S/N @ 1W, 118dB 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-F6 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 0.2V to 4.0V.

Crossover Mode Switch: The Alpine PDX-F6 offers independent crossovers for the front and rear channels. Each crossover can be set to HP (high pass), OFF (full range) or LP (low-pass).

Crossover Frequency: You can independently select the crossover frequency for the front and rear channel crossovers. The crossovers are variable from 30 to 400Hz (-12 dB/oct).


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-F6 includes four quick connect high-power speaker terminals. Bare speaker wire, up to 8 gauge, is held in place by screw-clamps on the quick connectors. The four speaker terminal quick connectors 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-F6 is equipped with four gold-plated female RCA jacks.

Fuses: The Alpine PDX-F6 is equipped with two 30-amp ATC 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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Alpine power on the high end is always solid and clean plus they last [ John  Aug 18, 2018 ]
The Alpine quality. I was deciding between this unit or the JL Audio HD600/4. The advisor said the Alpine is a better choice. [ Tom  Nov 09, 2017 ]
To drive my hertz hcx 165 speakers [ eric  Jul 16, 2017 ]

3 questions already asked

Thanks for your question. For information on selecting the best amp for your speakers I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Kenny  Dec 06, 2016 ]  Staff
The bridged power of 300 watts at 4ohms will be plenty to drive the sub. However, you need to check documentation for the amp to make sure it can be run in a 3-way configuration like you want. [ Chris  Nov 29, 2016 ]
Yea. It's a low wattage sub. I power mine with 300 watts. Beautiful sound [ Allan  Nov 29, 2016 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your amp. They will be able to pull up both amps to see if this will work. If it does not, then they will also be able to discuss other options with you. [ Jeff  Mar 18, 2014 ]  Staff