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Alpine PDX-V9

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

28 Reviews | 17 questions - 37 answers

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Item # 500PDXV9

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Our take on the Alpine PDX-V9

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.

Alpine Authorized Online Dealer

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
  • optional RUX-KNOB.2 wired remote level control for sub channel
  • 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

What's in the Box:

  • 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

Featured Video:

Worked perfectly boosting sound in all 4 speaker locations and my JL sub. Recommended by the helpful chat agent. They know what they are talking about!

Scott B, Houston tx


Alpine PDX-V9 Reviews

Average Customer Review(s):

(28 Reviews)

Fantastic Ampifier

Hunter from Plano, TX on 1/8/2018

I installed this amp in my 2000 f150, I combined it with 4 Kenwood door speakers and a car shaking alpine sws 12d4 (highly recommend) and this amp is earth shattering. It makes a fantastic difference and really boosts any cars audio system to its full and complete potential. Highly recommend this amp to anyone looking to spend a little money on a quality system. It is important however to keep it well ventilated, bass filled music at high volumes for around 30 minutes or so will heat it up quick.

Pros: Small, Efficient, powerful, worth the cost, easy to setup even for beginners in car audio

Cons: Heats up fast

Alpine PDX-V9

Jack from Round Rock, TX on 8/8/2017

Crutchfield Customer Review (What's this?)

Excellent amp with a tiny footprint. Love how clean the wires are with connection adapters. I mounted this to 1/2 MDF tomthe back wall of my 2010 Ram 1500 crew, gave it 1" clearance from the Dynaline I installed. Huge difference with aftermarket Kenwood head unit, kicker speakers and JL audio stealthbox.

Pros: Size & performance


Alpine PDX-V9

David from Acworth, GA on 5/27/2017

Crutchfield Customer Review (What's this?)

I must admit, when the amp worked it was fantastic. Clean, rich sound with no distortion even at high volume. Unfortunately, my PDX decided to clock out for some reason. I suspected something was amiss on first start-up because it would just drop power for no reason. Thankfully, I purchased this amp from Crutchfield and they've shipped me a new one. I'm hoping I just got a bad one first go round. I will never purchase car audio equipment from anyone other than Crutchfield.... you guys are the best!

Pros: Awesome amp... when it works

Cons: Not so awesome amp... when it doesn't work

Alpine PDX-V9

Michael from Salt Lake City, UT on 4/14/2017

Crutchfield Customer Review (What's this?)

Birth sheet puts this thing at 129 watts per channel and 459 watts for the sub channel. Everything about this amp is impressive, especially its compact size which lets me mount it in more discrete locations away from prying eyes. I haven't got to listen to it yet as my build isn't done, but from the other reviews I know its going to work great for my Jeep Wrangler.

Pros: Birth sheet gave it lots more power than advertised Small footprint for easy mounting

Cons: Not the cheapest by any stretch but there is some heft in that small package.

Perfect for my setup, compact design!

Scott B from Houston tx on 3/21/2017

Crutchfield Customer Review (What's this?)

Worked perfectly boosting sound in all 4 speaker locations and my JL sub. Recommended by the helpful chat agent. They know what they are talking about!

Pros: All in one 4 channel plus sub! Perfect!


Alpine PDX-V9

Anonymous from Elk Grove, CA on 2/24/2017

Crutchfield Customer Review (What's this?)

Very amazing product and the sound and build quality it has it phenomenal, I would recommend this to anyone who is willing to go on the more pricey route but it is worth it and it's easy to install



Everything you need in one

Anonymous from Malibu, CA on 1/14/2017

Do yourself a favor and get this amp to upgrade your system. Of course you could do a million different to make your system sound very impressive while you rattle off everything in it to your buddy or you could get this amp, power everything in one simple solution then ruin your buddies day because he did the more complicated setup that just took up more space and cost more money.

Pros: It does everything you need for a simple upgrade.


All in one solution

Rex from Arkansas on 5/4/2016

I've had this amp for about a year now. I just transferred it to a different vehicle and remembered how impressed I've been with it. I'm using it to power all the speakers in my Toyota 4runner. This includes Image Dynamics component 6x9's in the front, Hertz Hi-Energy 6.5's in the rear, and a single 12" cheap Pioneer sub in the back (300 watts RMS). The head unit is a pretty standard Pioneer 3700BHS with 4 volt pre-outs, nothing super fancy. All of the mids I have are pretty sensitive and only need 150 watts RMS maximum. For my setup, this amp is extremely clean and has a flat response while playing all types of music. Look up some independent reviews for the technical data on the low noise ratio and damping factors. The point is that this amp does exactly what it's meant to. It adds no discernible coloration or noise of it's own, it plays effortlessly at the highest volume I've ever attempted, and it can simultaneously play car shaking bass while still being accurate enough for you to tell the difference between a Yamaha or Zildjian snare drum. The only thing I'd suggest is putting it somewhere with good ventilation. I've never had a problem, but it will get pretty warm when playing bass heavy music at higher volumes for extended periods of time. It almost seems like cheating to only install one small amp that does everything. It's also very easy to work with. It's got little plugs that you attach the wires to and then plug into the amp, you'll see, it's really cool.

Pros: size, power, consistency, sound quality, only having to install one amp (or pay for only one installation / amp kit), dollar per RMS wattage, looks, versatility (crossovers, bridging ability, works on 2 or 4 ohm speakers), somehow knows the correct phasing for your speakers if you screw it up

Cons: can get warm


Anthony T from Reseda, CA on 4/20/2016

Anybody says this doesn't have enough bass should stop installing their own systems. They don't know what they doing. Gains are 1/4, birth sheet came 110x4 and 536 on the sub, a little weaker than some of the amps birth sheets here. My system is not even perfect and yet everybody says is sounds fantastic, I have Hertz Components in the front, stock rears for fill and a cheap Sony sub. I had to fix the bass response with an old Audio Control EQL, it's not perfect, it's over-boosted for some songs and not enough for others. But for the sum of it's parts, it's good.I am going to trade-in this car so I don't want to spend any more money on it, but I will be using the V9 in my next car and will get it's signal from an Audison Bit Ten and a proper ported enclosure as I just don't like the lack of low end typical with small sealed boxes, I can get way more out of a smaller sub in the proper ported box.

Pros: Everything

Cons: None

small package awesome performance

Doug R from saratoga springs, NY on 4/11/2016

Crutchfield Customer Review (What's this?)

was skeptical because of the price but relied on Alpine reputation. its a small package that packs a punch. one amp that full filled the need for upgraded dash and soundbar speakers as well as subwoofer. I added the bass knob which was an awesome addition for changes on the fly.

Pros: one amp that met all my needs perfectly with sound quality and small size.

Cons: higher price

500 watt bass channel questionable

Rich from norcal on 11/1/2015

Purchased to run entire system off one amp in a Tundra crew max.6X9 kicker sepperates up front with kicker tweets in sails and polk tweets in the dash running off front channel and some kicker 6.5 door speakers in the back.JL Audio SB-T-TUNDCMAX/13TW5v2 single stealth box in the back.I was running a pioneer gm d8604 and it sounded good but changed it up when I got a sub.The Alpine sounds clean with plenty of power to run the 4 channels but its not quite driving my sub as expected.Before purchasing the Alpine I unplugged the rear speekers and just bridged the rear channel which provided the sub with 300 watts rms.Upgraded with this Alpine that they list as providing a dedicated 500 watts rms to the mono channel and sadly there was no change in power?I should feel the thump and the pressure on my back with 500 watts rms 3 ohm load.Amps birth sheet listed it as 115 watts x4 and 510w x1.Funny when I first read this and it stuck in my head as 5 (10w) bass outpute.My JL Audio SB-T-TUNDCMAX/13TW5v2 is quite under powered I don't think its pushing 500 watts not when there is no change with another amp that pushes 300 out of two of the 4 channels.Ground checks and 13.8-14+ supplied.Time to dig out the MTX pro BLUE thunder old school dependable no bs power where a 400 watt rms equals a 640 watt rms birth sheet.This amp shook windows of 3 or 4 cars ahead of me?

Pros: Clean sounding amp

Cons: 500 watt rms to sub channel is not accurate.

Allot of thought went into this amp!!

Bravo from Texas on 7/26/2015

Look, I have had two 12 inch JL w3 V3 subs hooked up to this amp in my Crew Cab Silverado and it was plenty of power and great sound. I wanted deeper base so I bought one JL W6 V3 subs in a JL Box, and I had to turn the gain down because it was to much power for the sub, but it was still not enough bass. Now I have two SA 8 V.2 Sundowns under my back seat rated at 500 watts RMS a piece. I was worried that I wouldn't get the sound I was looking for with only 250 watts a sub but I was wrong!! My birth sheet was 568 and I did all the install work my self, the hook ups on the back for the speaker wire was just well thought out. My gain and filter for my Focal 165 KRS on the front of the amp make tuning easy. I have this amp mounted underneath my front middle seat, Its like a secret storage box built from the factory and every time I show to some one they are amazed that one amp does all that sound and fits tucked away under my seat. They all are also blown away that I did it my self because it really looks professional, I owe that to the Alpine for the easy plugs they designed. I have had no problems with this amp. YOU WILL NOT BE DISAPPOINTED WITH THIS AMPS SIZE, QUALITY, POWER AND VERSATILITY. Do your self a favor buy this amp and buy the bass knob. Bravo out!

Pros: Compact, powerful, functional and simple design. Well thought out design.


My First Digi-Amp . . .

BiggJonn from Maryland on 5/18/2015

I just bought my FIRST digi-amp for my 2015 Ford Fusion ... THIS ... THING ... ROCKS!! True it is a bit pricey ..BUT.. it IS an Alpine. Now, be it that I'm not all into the competition thing nor do I need to have it up so loud you can hear me coming down the road ... the clarity is outstanding. I've paired this up with Pioneer TS-D speakers and a Kicker L7-12 in the back and i couldn't have been happier with what ( comes the plug...) POPTRONICS in Baltimore, Md suggested / sold / installed. I got mine . . . You better get yours

Pros: small size .. packs a mean punch .. powers entire system

Cons: it IS pricey ...BUT... it IS an ALPINE (and you get what you pay for)

decent power in a small package

JIReady from Georgia on 5/12/2015

Crutchfield Customer Review (What's this?)

Has all the crossovers and adjustments you will ever need and decent power for such a small package. I have door speakers on 4 channels and 2 jl w1's on the sub channel and I was surprised just how much bass I got out of this. It came pre tested with 125 watts on the four door channels and 550 watts on the sub channel.

Pros: 150 extra watts for free. Small size.

Cons: Gets so hot at times it released a small amount of oil out of the bottom when I first broke it in.

Exceeded expectations

Anonymous from Texas on 5/12/2015

Crutchfield Customer Review (What's this?)

The birth certificate that came from the factory stated actual 125watts x 4 and 555watts x 1 so installed speakers and subs that could handle the power and it does so effortlessly. The wiring is stupid simple whereas anyone can do it and the overall build quality is on par with Alpines reputation..

Pros: Lots of power in a relatively small package

Cons: None noted


Juan from forth worth, tx on 12/21/2014

I love this amp im i running everthing with single amp its expensive but you would save money if using 2 amps i have it with 4infinity 5×7 and 2 w1 jl audio and a custom box under the back seat of a 2003 f150 supercrew

Pros: Run all you system with this amp and its small fits everywhere

Cons: none


Steffon from michigan on 7/16/2014

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

Homer from Millbury, MA on 7/1/2014

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

dnut from Ann Arbor, MI on 6/14/2014

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

SteveB from Fitchburg, MA on 2/14/2014

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

Anonymous from Aeia HI on 10/1/2013

Crutchfield Customer Review (What's this?)

Perfect for component, 10" sub.

Pros: Small, compact and powerful


Power in Small Footprint

Chris from Bronx, NY on 5/7/2013

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

ScotC from Las Vegas, NV on 4/9/2013

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....

Patrick from Chester, VA on 8/8/2012

Crutchfield Customer Review (What's this?)

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

jplayz187 from houston,texas on 7/28/2012

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!

Tom T from Eugene, Oregon on 7/18/2012

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

Mike from Chicago on 6/9/2012

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


peter from fountain valley,ca on 6/3/2012

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



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-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

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Staff Reviews

Product reviews from the Crutchfield Labs

The Alpine PDX-V9 is the 5-channel version of their popular PDX amps. It's small, stackable with other PDX amps, and gives you serious power, with a tiny footprint.

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Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Excellent sound specs [ Giana  Nov 21, 2017 ]
Need a good five channel great brand [ Gage  Sep 29, 2017 ]
It's the complete package. [ John  Jul 26, 2017 ]
1 amp does all, including sub [ scott  Mar 05, 2017 ]
Work with technic pnp harness for my Bmw 07 328i hifi system [ Mahdi  Jun 02, 2016 ]
BADASS [ GREG  Mar 20, 2016 ]
I hate spending money twice, I'm to poor to be buying things over and over so I rather get the right stuff and be done with it. [ FIDEL  Feb 02, 2016 ]

17 questions already asked

The 5th channel of the Alpine PDX-V9 provides up to 500 watts RMS so, it will not realize the full potential of the RF P3D4-12 (600 RMS) but it will still power it very well. [ Ryan  Nov 29, 2017 ]  Staff
The bridged configuration is covered on page 14 of the Alpine Owner's manual. You can download a copy of the manual by clicking the link for it under the "What's in the Box?" heading on the amplifier's main webpage. I hope that helps. My Bio: [ Ryan  Aug 28, 2017 ]  Staff
That's pretty much the exact same way I'm running my system with competition speakers in the doors and the JL sub. In doing so I found that I had to dial down the amp for cooling and the competition alpine r types couldn't handle that much power anyway. I was looking for studio quality sound and nailed it. [ RAYMOND L  Aug 26, 2017 ]
yes you can run doors at 4 ohms and sub at 2 ohms sub should run just fine as well [ austin building  Aug 26, 2017 ]
The higher resistance of the 8 Ohm sub will get about half the rated 4 Ohm wattage so; around 250 RMS. I hope that helps! My Bio: [ Ryan  Apr 20, 2017 ]  Staff
No, you need like 1000 watt amp. I love the 5 ch pdx, but it is only like 250 watts, not goona do much for a w7 [ austin building  Mar 02, 2017 ]
I forgot to tell you I am powering the same sub with a sundownaudio 1500RMS at 1 ohm, currently on a two ohm load feeding 800 watts to the sub. Perfect match [ Daril  Jan 15, 2017 ]
Normally you want to stay over 75% of your subwoofer RMS. This sub is rated at 750watts RMS not 1000, misleading information from alpine. RMS is 4 times less the max power in this case 3000. With this amp rated at 500 you are only providing 67% of your sub rated RMS (750) and while it would thump I would get a bigger amp. The reason for this is because when you underpower a sub, trying to get louder you will send clipped signal. It is always better to get an amp either rated the same as the sub or more, that way you will have more room left letting your amp work cooler and insuring your signal is clear. [ Daril  Jan 15, 2017 ]
Yes it'll run fine and sound good, but will get a good amount louder and sound great if you put 1000 rms to it. [ JAROD  Jan 13, 2017 ]
Yes you can run the sub at 2 ohm and the door speakers at 4 ohm, that is exactly what I did, i ran 4 alpine type r 61/2" @ 4ohm and a alpine type r 8" sub 2 ohm. [ austin building  Dec 26, 2016 ]
No I returned this for a fosgate t 1000 4 chanel to do that. Happy new year [ RICHARD  Dec 26, 2016 ]
inputs are RCA only. Manual does not say anything about speaker inputs. [ JOSEPH M  Oct 24, 2016 ]
This setting means the High Pass filter frequency cut off, so if really depends on what channels you are running on this output and what speakers. If the speakers have their own crossovers simply leave it off or set it to a high value to protect the speakers from blowing at high volume. [ Dominic  Sep 27, 2016 ]
This amp would not run 2 shallow subwoofers that have the RMS watt range you listed. Each subwoofer would get 250 watts and that's lower than the 300 minimum that you indicated your subwoofers need. But we have amps that can and shallow subwoofers that will run on this amp. Feel free to call an advisor on 1-800-324-9695 for a personal recommendation! My Bio: [ Paul  Aug 12, 2016 ]  Staff
Well mine is running a set of kicker comps 12 and 2 sets of Polk miss and tweets sounds good but if your looking uber bump it's not the amp you want [ johnathan  Mar 15, 2016 ]
It can move rms 500 watts on 4 and 2 ohm on the sub channel...I have an alpine type-r 15" hooked up and it hits really nice [ Homer  Mar 14, 2016 ]
Enter an answerI would do the following assuming you have front and rear full range speaker locations in your car. - Will you want to use the fader in the factory head unit? If so, then run the Audiocontrol unit off the front OEM speaker channels to the PDX-V9, and run the rear speaker channels in stock connection configuration like nothing was added. - If you run it this way, then you would run two main RCA channels from the Audiocontrol to the PDX-V9, then using the selectable input switches on the PDX, run 4 + 1 channel out to the Polk mids, tweets, and JL subwoofer. All 4 channels will provide a dedicated 100W RMS to each midrange and each tweeter. - This would eliminate the need for the passive crossover that came with the Polks. That is normally fine as passive crossovers from the lower price point speaker sets are nothing special. The active crossover in the Alpine PDX-V9 will provide better sound quality and more precise tuning over crossover points and gain settings. The only disadvantage is you will not know the EXACT crossover points. For this, you will need an o-scope or RTA meter to measure where the roll off frequencies will be. For starters, shoot for somewhere in the 3-4K range for low pass midrange and high pass tweeters. I tried looking up the crossover values built into your Polks, but could only find the -12dB value and not the frequency. - For the subwoofer channel, you have two choices: 1) Run the RCA "bass" channels from the Audiocontrol to the subwoofer channel input on the Alpine. This way, you can play with the "Accubass" to see if it is worth the hype. 2) Ignore the RCA "bass" channels from the Audiocontrol and have the Alpine control all bass functions. If so, I HIGHLY recommend investing $30-$50 for the RUX-KNOB. It easily mounts anywhere and uses a phone cable to connect to an input port on the PDX-V9. When plugged in, it overrides the gain control for the sub channel and allows you to adjust subwoofer volume on the fly. to this question. [ Craig  Jan 19, 2016 ]
I had mine professional installed, I'm not sure how they set it up. Sorry I couldn't be of more assistance. [ jeff  Jan 12, 2016 ]
Well if externally from the amp there is a crossover from the woofer to tweeter I would run that off the amp...basically the amp has 5 channels a front left/right a rear left/right and a sub channel each output 100watts...if your only running the 2 speakers off the amp with the sub I would just bridge 1-4 to make only 2 channel output and hook the speakers up that way...the speakers will handle the power and you'll just have to make sure you don't over gain the long as you don't over gain you won't be over feeding the speakers...also depending on the size of your Polk speakers you may want to set the crossover for them off the amp because it will make the music clearer...I would not run a separate channel to the tweeters because the crossover doesn't cover the ranges you need to cut low levels out also you would need a way to feed signal the same as the other speaker so you would need an rca splitter...all that being should just bridge and run to the speakers with an in-line crossover between the woofer and tweeter and make sure you adjust your gain settings correctly [ Homer  Jan 12, 2016 ]
I would use one channel per component speaker (woofer and tweeter) because the RMS rating is for the entire component speaker system not for each individual component (i.e tweeter + woofer + crossover = RMS). [ Christopher  Jan 11, 2016 ]
I had it professionally installed, I didn't hook it up. [ jeff  Feb 03, 2015 ]
Dosen't matter, the amp internally adjusts the polarity to be correct. The only thing I did to be consistent was to put all the plugs the same way. Don't think it mattered, was more of an ocd thing. [ Brian  Feb 02, 2015 ]
They go either way didn't matter this is a killer little amp it learns to power what way you plug them in really. Neat amp it will get louder as you go [ johnathan  Jan 31, 2015 ]
Either way, the negative makes its connection on the outside of the plug. [ Christopher  Jan 31, 2015 ]
It does not matter which way you put the plugs in i put all mine + up...i dont even think it matters if they all go the same direction but to be safe i would put all in the same direction [ Homer  Jan 31, 2015 ]
It doesn't matter as long as you match your positive wire to the + and the negative wire to the - . The outside of the plug supplies one of the signals while the inside of the plug supplies the other. Similar to how RCA cables work. If your truly interested in which signal goes where, use a continuity tester. [ TODD  Jan 31, 2015 ]
It doesn't matter. The Amp will auto-sense the polarity once the connector is attached to the Amp. Just connect everything with everything off. [ CHRISTOPHER  Jan 31, 2015 ]
That's the nice thing about these amps. They can be plugged in either way without any problems.. I don't remember which way I did mine, but they're all facing the same way just to look nice. [ Kevin  Jan 31, 2015 ]
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