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Alpine PDX-V9

5-channel car amplifier — 100 watts RMS x 4 + 500 watts RMS x 1

Item #: 500PDXV9

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12 Reviews | 2 questions - 7 answers

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5-channel powerhouse

The Alpine PDX-V9 5-channel amp delivers a whopping 100 watts RMS each to four speakers at the same time it blasts 500 watts RMS to your sub setup. This amazingly compact amp uses beefy internal components and clever engineering to keep the power output strong and the noise low for superb fidelity and control. The adjustable crossovers feature an extended range of crossover points, allowing you to use this amp with component tweeters, midrange speakers, or midbass drivers.

They make a cool stack of amps

Alpine packs Class-D amplifier technology into this PDX amplifier for awesome power from a 2" tall frame. This small-but-mighty amp runs so cool that you can stack it together with other PDX amps into a single unit — the multiple heatsinks actually couple together to cool the entire stack. Each PDX Series amp offers the same 8" by 10" footprint, so they'll fit in hatchbacks, trunks, truck cabs, and any vehicles with limited space.

PDX-V9 connection panel

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, ensuring a tight connection while guaranteeing that your speakers work in unison. Gold-plated RCA inputs, outputs, and power connections resist corrosion and signal degradation.

PDX-V9 control panel

Product Highlights:

  • 5-channel car amplifier
  • 100 watts RMS x 4 + 500 watts RMS x 1 at 2 or 4 ohms
  • 200 watts x 2 bridged at 4 ohms + 500 watts x 1
  • CEA-2006 compliant
  • stackable installation design with front-panel controls
  • variable high-pass filter on front channels (30-6000 Hz, 12 dB/oct)
  • variable high-pass filter on rear channels (30-600 Hz, 12 dB/octave)
  • variable low-pass filter on subwoofer channel (50-600 Hz, 24 dB/oct)
  • variable subsonic filter on subwoofer channel (0-30 Hz, 24 dB/oct)
  • quick-connect speaker connectors
  • Class-D amplifier design
  • MOSFET power and output stages
  • fuse rating: 40A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-1/8"W x 2-1/16"H x 8-9/16"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.

Hands-on research

What's in the box?

Download owner's manual

  • 5-Channel Class-D amplifier (with two 40A ATO fuses inserted in chassis)
  • Battery connector plug
  • 5 Speaker connector plugs
  • Four M4 x 36mm Hex/Phillips-head self-tapping screws
  • 2mm Allen wrench
  • 4mm Allen wrench
  • Owner's Manual (Eng/Fre/Spa)
  • Verification Certificate
  • Limited Warranty Card
  • Online 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.

Channel Design: The Alpine PDX-V9 can be configured as a 5-channel, 4-channel, or 3-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 + 500 Watts x 1) from 2 to 4 ohms. This allows excellent flexibility with multiple speaker and subwoofer loads and is adjusted automatically.

CEA 2006 Compliant: The PDX-V9'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 Ohms: 100 watts RMS x 4 and 500 watts x 1 @ 14.4 Volts with <1% THD+N
  • 2 Ohms: 100 watts RMS x 4 and 500 watts x 1 @ 14.4 Volts with <1% THD+N
  • Bridged (4-ohm): 200 watts RMS x 2 @ 14.4 Volts 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-V9 offers a super-wide, frequency range (5Hz-50kHz, +0/-1dB) for unparallel sound quality and detail.

Ultra-Low Output Impedance: With ultra-low output impedance, the PDX-V9 offers extremely controlled, tight bass for unprecedented sound quality. The amplifier's Damping Factor is rated at >500 for channels 1-4 and >1000 for channel 5.

High Signal-to-Noise: This amplifier is capable of S/N ratios up to 92dB S/N at 1W and 112dB 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.

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%).

Trim Rings: The PDX-series amps each have removable trim rings that can be custom painted to match your vehicle, or personalized to anything you want.

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. The stacking plates are included with other PDX-series amplifiers.

Note: 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 Allen wrench and then prying the front panel open.

Gain Control: The PDX-V9 provides independent rotary controls for the front, rear, and sub 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 for the front and rear and 0.1V to 4.0V for the sub.

Optional Remote Bass Control: The amplifier has an RJ-25 modular jack for adding the optional RUX-KNOB Remote Bass Control for full control of the bass adjustments from the dash. You can also control multiple amps from the same controller with simple telephone cord adapters.

Note: The Remote Bass Control will only control the mono subwoofer channel (channel 5).

Crossovers: The Alpine PDX-V9 offers independent crossovers for the front, rear, and sub channels, which can be set as follows:

  • Front (High-pass only): 3-way switch (Off, x1, x10); Frequency: 30-600Hz (x1) or 300-6000Hz (x10)
  • Rear: 3-way switch (Off, HP, LP); Frequency: 30-600Hz (HP) or 300-6kHz (LP, if front switch set to x10); CH3/4 Input Switch (1/2 or 3/4)
  • Sub: Frequency: 50-600Hz (LP), 3-30Hz (Subsonic); SubW Input Switch (1+2+3+4 or SubW)


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-V9 includes 5 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 speaker terminal quick connectors then plug 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-V9 is equipped with six gold-plated female RCA jacks.

Fuses: The Alpine PDX-V9 is equipped with two 40-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 open the box, verify contents, 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.

Alpine PDX-V9 Reviews

Average Customer Review:

12 reviews
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Written By Steffon, michigan on Wednesday, July 16, 2014

Crutchfield Customer Review (What's this?)

ive had this amp for only a few weeks now, but so far I am highly satisfied with this amplifier. I have pushed it very hard and it doesn't lose its clarity. I have it paired with two alpine swa 12s4 subwoofers and four 6 3/4 kicker cs speakers and it just pounds in my firebird. I couldn't be happier. \

Pros: sound clarity, small

Cons: it tends to get a bi hot even though it is out in the open with plenty of air movement

Alpine PDX-V9

Written By Homer, Millbury, MA on Tuesday, July 01, 2014

Crutchfield Customer Review (What's this?)

Works great have all car speakers hooked up gives good sounding clean power...running a 15" sub that has a 350w draw and everything runs clean and sounds great

Great power, small package

Written By dnut, Ann Arbor, MI on Saturday, June 14, 2014

Crutchfield Customer Review (What's this?)

Bought this unit to power the upgraded 5 speaker system in my new 2014 Mustang. After a lot of looking around, decided to pick this amp as the base unit for the system. Has great power - the system actually goes louder than I can take it - much more than the Shaker 500 system in my previous 2006 Mustang. The unit is small enough that I mounted it under the rear deck - so I still get to keep the trunk space that I had, minus the sub in the corner of course (used the custom fit enclosure for that, so not too bad). Matched with Alpine SPR-68 in front, Rockford Fosgate PPS4-6 in back and Rockford Fosgate 12" P3 sub

Pros: - Great power, clear and clean sound through the range I can take. - Small size makes easy to mount - Nice connectors for the speakers so you can unplug and rearrange wires easily

Cons: None so far.

I must be missing something

Written By SteveB, Fitchburg, MA on Friday, February 14, 2014

Crutchfield Customer Review (What's this?)

Disappointed with the strength delivered to my system. I was truly hoping for more power than I get. Have to turn WAY up to get anywhere near the volume I'd hoped for when powering Alpine SPR-50C component speakers in front, Alpine SPR-69 speakers in the rear, and a JL CS110RG-W3v3 sub in the trunk. The sound quality is quite good, but this system really lacks power.

Pros: Sound quality

Cons: Lack of thump, especially for the price.

Alpine PDX-V9

Written By Anonymous, Aeia HI on Tuesday, October 01, 2013

Crutchfield Customer Review (What's this?)

Perfect for component, 10" sub.

Pros: Small, compact and powerful

Power in Small Footprint

Written By Chris, Bronx, NY on Tuesday, May 07, 2013

Crutchfield Customer Review (What's this?)

I'm currently using this Amp to push Alpine SPR-60C's (component) up front, Alpine SPR-60's (coaxial) in the rears and an Alpine SWR-12D2 in a 2009 Honda Accord. No issue delivering the needed power to all speakers on channels 1-4, nor sub on the 5th channel. The birth sheet included specifically indicated 110W RMS per channel (1-4) and 560W RMS to the sub. The sub has enough power to make the rear deck rattle, so gains are set to normal. When used with the "RUX-KNOB" accessory, the AMP provides full control over your speakers.

I couldn't believe how clear and crisp the highs and lows that are produced. The performance delivered upon initial installation was a bit overwhelming, but a lot of time was needed to adjust the gains and crossover points to get the perfect sound stage needed. This small amp provides the power to adequately run a nice aftermarket system, enough to make a parked car alarm go off if need be. Not my forte though, but nice to know if someone needed the power.

I've never experienced and overheating (weather has been around 60's here in NY) and I have had the Amp running for a good 3+ hours at a time. The real test would be when summer time hits (90+ degree weather). Aside from that, I have not experienced any "hiss" sounds from this amp. I made sure I properly grounded this unit to avoid any electrical noises. The connectors are designed to reduce electrical noise and that's a big plus.

Pros: Power and Efficiency delivered in a compact size for your entire system, including the sub.

Cons: Allen wrench needed to remove the faceplate to gain access to amp settings (channel gains, crossovers, etc).

Smokin' Hot Amp

Written By ScotC, Las Vegas, NV on Tuesday, April 09, 2013

Crutchfield Customer Review (What's this?)

This sucker may be one of the best amps on the market. Each amp comes with a certification of testing, for example, even though this amp says 100W per channel, mine tested out at 144W per channel. My installer dialed down the gains for the cleanest possible sound without distortion and this baby just flat out rocks! It is unbelievably clean, with crystal clear voices and mid-levels, and the bass just booms, baby booms. I had my system installed by a local Master Certified Tech, and even he noted that this was one of the cleanest and most powerful amps he's ever heard. He told me I could power 10 speakers off this if I wanted. Don't hesitate because it's pricey... you get what you pay for.

Pros: Clean, unadulterated power. Everything you need to power your car's system in one package.

Cons: Price ain't cheap.

Can't be beat for the price....

Written By Patrick, Chester, VA on Wednesday, August 08, 2012

I was waiting for Alpine to introduce a more powerful 5-channel amp to their line up, and they finally did! I actually traded up a JL900/5 for the PDX-V9. Same specs and for $300 less. The specs on the PDX-V9 are actually better than the JL900/5, not sure why Crutchfield doesn't list them. I'm not bashing JL Audio in any way, I just couldn't use the JL900/5 for my particular application. The JL amp kept overheating and driving itself into protect mode. Returned one and recieved another, and it did the same thing. Just to find out it was the heat in the trunk driving the internal temperature of the amplifier up even before it was turned on. Anyway, after 2 JL's, decided on the Alpine and absolutley love it! Great sound and plenty of power. I did notice that the Alpine sounds a bit cleaner than the JL, and the gains don't have to be set quite as high. The JL would distort a bit, which was dissapointing, but not the Alpine. The amp runs pretty cool overall even when it's been sitting in the trunk of a car for 8 plus hours in the hot sun. I'm driving 2 pairs of Alpine Type-R's, components in the front and 2-ways in the rear deck. As for a sub, it's pushing a JL Audio H.O. Powerwedge with 12"W6 DVC. The bass is tight and accurate and very LOUD. I wouldn't try to power a W7 with this amp, but mid-grade to some upper end subwoofers will do fine. I would just try to find a subwoofer that is rated for 500W RMS continuous. Overall, I'm very pleased with this Alpine product.

Pros: Plenty of power, small, runs relatively cool, plenty of crossover adjustments

Cons: None that I can think of...

pdx v-9

Written By jplayz187, houston,texas on Saturday, July 28, 2012

the amp is good for what it is,but the sub channel needs more power..waste of money,if you are looking for a amp to run a top of the line sub, go with a mono amp,and add a separate 4 channel amp to go with it. DON'T Waster your money for something that looks good, it lacks power

Pros: the only pro is, it's small

Cons: over priced

Awesome Amp!

Written By Tom T, Eugene, Oregon on Wednesday, July 18, 2012

I have this amp installed in my reinell 207LS Boat. Twp speakers on the tower (6" Kickers), four in the boat itself (6" Alpines), plus an 12" sub. This is the best sounding system I've ever heard in a boat for the price I paid. Nobody can believe how clear and loud that this system is. the amp makes this system!! Takes up littel space and doesn't seem to get too hot.

Pros: Clear, crisp, loud, small, efficient

Cons: None

Alpine PDX-v9

Written By Mike, Chicago on Saturday, June 09, 2012

I have this amp installed in a Toyota FJ Cruiser and this amp rocks. I have it powering 1 set of 61/2 JL Audio C3-650 up front. In the rear I have two Alpine 61/2 and 4" component speakers. For bass I'm using a JL Audio 12w3v3 everything sounds loud and clear the bass hits really hard.

Pros: Small Amp, Good Price for a Powerful 5 Channel Amp.

Cons: None


Written By peter, fountain valley,ca on Sunday, June 03, 2012

great all in one amp. takes up little space.i put this amp under my seat in my dodge ram quad cab. birth card tested at 114watts rms x4 and 586rms mono. it only takes a 4awg wire witch is not that expensive. stays cool even when i go to the desert and crack for hours.

Pros: easy to tune, great quality, and you get what you pay for

Product reviews from the Crutchfield Labs

The Alpine PDX-V9 is the "do it all" version of Alpine's popular digital PDX amps. It's small, stackable with other PDX amps, and gives you 100 watts RMS x 4 for your speakers, plus 500 watts RMS x 1...

What are the Labs?

Get everything you’ll need to enjoy your new Alpine PDX-V9

You'll need an amp wiring kit to install your new amplifier, as wiring is not included.
Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
Add a remote and control your amp from the driver's seat.
For multi-amp systems, you'll need a separate fuse holder.
Helps protect your car's charging system and improves power handling. Required power and ground wires not included with cap.
The right tools will make the installation easier.
EFX PA4BX Wiring Kit

EFX PA4BX Wiring Kit

4-gauge amplifier wiring kit — includes 2-channel patch cable

Item #: 142PA4BX


Add to Cart
Kicker PK4

Kicker PK4

4-gauge amplifier power wiring kit

Item #: 206PK4

Add to Cart
Rockford Fosgate RFK4

Rockford Fosgate RFK4

4-gauge amplifier power wiring kit

Item #: 575RFK4


Add to Cart
Rockford Fosgate RFK4X

Rockford Fosgate RFK4X

Complete 4-gauge amplifier wiring kit
Includes patch cable and speaker wire

Item #: 575RFK4X


Add to Cart
T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1


T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1


Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B


T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (20-foot)

Item #: 120RCA202


Add to Cart
T-Spec 4-Channel RCA Patch Cable

T-Spec 4-Channel RCA Patch Cable

17-foot length

Item #: 120RCA174


Add to Cart
EFX 17-foot RCA Patch Cable

EFX 17-foot RCA Patch Cable

Item #: 142A17C


After $2.00 Savings Add to Cart


Remote subwoofer level control

Item #: 500RUXKNOB


Add to Cart
EFX CFHG4 Fuse Holder

EFX CFHG4 Fuse Holder

In-line AGU fuse holder accepts 4- to 8-gauge wire

Item #: 142CFHG4

Rockford Fosgate RFFAGU Fuse Holder

Rockford Fosgate RFFAGU Fuse Holder

Platinum-plated AGU fuse holder
Fits 4- or 8-gauge cable

Item #: 575RFFAGU


Add to Cart
T-Spec Capacitor

T-Spec Capacitor

1.5-farad capacitor with red LCD meter

Item #: 12015DDC


Add to Cart
Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT


Add to Cart
S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100


Add to Cart
S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650


Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533


Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL


Add to Cart
Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042


Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL


Add to Cart
DEI Heat Shrink Tubing

DEI Heat Shrink Tubing

Black 4-foot length (Assortment)

Item #: 696010839


Add to Cart

Questions & Answers Ask the community. Share your knowledge.

2 questions already asked

I use 14g for the speaker wire and 10g for the sub wire. [ LAURA  Jun 28, 2014 ]
I had it installed at a shop, i don't know what size wire they used. I don't know what the lowest gauge wire the amp will accept. [ jeff  Jun 25, 2014 ]
4 ga [ DOYLE  Jun 25, 2014 ]
I just bought this and i do believe i am running 8 gauge to my sub from on...the holes for each speaker output are pretty big and should handle 6 gauge maybe 4 [ Homer  Jun 25, 2014 ]
You can use 14 gauge easy . I have even used 8 gauge on mono amp for speakers and the plugs are the same for the whole PDX line [ PAUL  Jun 25, 2014 ]
4 gauge [ johnathan  Jun 24, 2014 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Jeff  May 01, 2014 ]  Staff