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Alpine PDX-F4

4-channel car amplifier — 100 watts RMS x 4

Item # 500PDXF4

The PDX-F4 4-channel amplifier delivers 100 watts per channel to your speaker system from its amazingly compact body.

Find what Fits your car

The PDX-F4 4-channel amplifier delivers 100 watts per channel to your speaker system from its amazingly compact body.

Discontinued item
6 questions - 16 answers

Item # 500PDXF4

About the Alpine PDX-F4

Huge digital power comes in a tiny package

The PDX-F4 4-channel amplifier delivers 100 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 200 watts each. Beefy internal components and clever engineering keep the power output strong and the noise low for superb fidelity and control. The adjustable frequency filters tailors the amp's output to your specific system.
Alpine Authorized Online Dealer

Huge digital power comes in a tiny package

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-F4 4-channel amplifier delivers 100 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 200 watts each. Beefy internal components and clever engineering keep the power output strong and the noise low for superb fidelity and control. The adjustable frequency filters 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.

PDX-F4 connections

Product highlights:

  • 4-channel car amplifier
  • 100 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
  • 200 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • stackable installation design with front-panel controls
  • variable high- and low-pass filters (30-400 Hz, 12 dB/octave)
  • quick-connect speaker connectors
  • 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
  • 10-1/8"W x 2"H x 8-9/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # PDX-F4

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
  • 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

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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-F4 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 (100-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-F4'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): 100 watts x 4-channel in 4-ohms @ 20 to 20,000 Hz with 1% THD+N
  • Four-Channel (2-ohm): 100 watts x 4-channel in 2-ohms @ 20 to 20,000 Hz with 1% THD+N
  • Bridged (4-ohm): 200 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-F4 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-F4 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 98dB 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-F4 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-F4 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-F4 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-F4 is equipped with four gold-plated female RCA jacks.

Fuses: The Alpine PDX-F4 is equipped with two 30-amp ATO fuses.

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Customer Q&A

6 questions already asked

How do I bridge my pdx 4?
[ Adam  Jun 11, 2016 ]
1 answer
I do not recommend it. Its a great Amp but not for that.
[ Timothy  Jun 12, 2016 ]  Staff
Can the amp support 2-ohm loads in bridged mode? The manual provides specifications at 4-ohm bridged, but make no mention of avoiding 2-ohm loads.
[ BrianATX  May 24, 2015 ]
2 answers
No, it should not be loaded at 2 ohms bridged.
[ IVAN  Jun 03, 2015 ]  Staff
It handles any load because it's a class d
[ PIERRE A  May 24, 2015 ]  Staff
Manual says to mount amp horizontal to the floor. Is this only for stackable? I want only one and I want to attach to the custom built amp tower I have in my trunk for display purpose and looks. It will be securely fastened and it will be at a 30 degree angle. Thanks in advance, -rob
[ titanium man  Apr 09, 2015 ]
5 answers
It should be fine as long as there's enough ventilation
[ kenneth  Apr 12, 2015 ]  Staff
mine is mounted vertical and has operated fine for a couple years.
[ Mike  Apr 12, 2015 ]  Staff
I mounted mine vertically in my single cab pickup, no problems for me!
[ Rick  Apr 11, 2015 ]  Staff
that bullet point in the manual is specific to stacks. If you are just mounting a single do it how ever you wish. "Stack installation should always be parallel to the vehicle floor - do not install at an incline. such as leaning against a vertical surface as this will invalidate your warranty."
[ SCOTT  Apr 11, 2015 ]  Staff
You should not have any problems mounting the amp that way. Mine is horizontal but i was going to mount it vertically behind the backseat wall of my pickup. no worries!
[ MICHAEL  Apr 10, 2015 ]  Staff
Would you please let me know which size of fuse should be used in the fuse holder (4 AWG power & ground cables used) routing this amp to the car battery? I am not sure if it should be a 60 amp or 80 amp, due to the amplifier on board fuses or a 4 AWG power cable present, respectively. Thanks
[ Hamed  Feb 03, 2015 ]
3 answers
I have it hook up to a 200 amp fuse to the battery but I'm running two amps and believe I'm using 0 gauge or whatever thickness gauge u can find. Both amps r pdx though
[ PIERRE A  Feb 04, 2015 ]  Staff
60 Amp is more than enough.. I run battery cable from the battery to within a couple feet of the amps, I run two Amps off the cables and some other electronics, I have a 140 amp breaker just in case anything shorts out, never been tripped in the many years i have had it.
[ Willie  Feb 04, 2015 ]  Staff
I used the kicker pkd4 kit with a 100 amp fuse for my system and it works great
[ Ryan  Feb 04, 2015 ]  Staff
I am thinking about this amp. Looking at the specs and speaker plugs. When the plugs are inserted into the amp does their orienation matter as long as the speaker wires are inserted into the plugs correctly? There is no + and - on the amp itself, and the manual is not clear relative to the plug orientation when you plug them in.
[ Chuck  Oct 22, 2014 ]
4 answers
In fact there would be no need to think about the orientation of the speaker output plugs. Since alpine uses the same technique present in RCA interconnects for speaker cable terminals, positive and negative ports are attached to the inner and outer metal joints. So do not consider the positions of speaker plugs. Just be ware of the signs + and - on the terminals, plug them to the amp - in any direction- and you are done.
[ Hamed  Jan 11, 2015 ]  Staff
If I remember correctly the plugs only went in one way. I love the amp!
[ Mike  Oct 24, 2014 ]  Staff
The amp actually does have + - signs on them
[ PIERRE A  Oct 22, 2014 ]  Staff
As polarity goes, I was told that the center conductor is the positive and the outside conductor is the negative terminal. I own 3 of these Alpine Amps, PDX-F4, PDX-F6 and the PDX-M6, Great Amps and I would purchase again.
[ STAN  Oct 22, 2014 ]  Staff

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