Polk and accessories specialist MOMO have joined together to create the high-performance Polk/MOMO subs. These stylish subs deliver powerful, accurate bass that sets you apart from the pack — both sonically and visually.

The Polk/MOMO MM2084 8" subwoofer features a polypropylene concave "dish" cone, metalized for maximum rigidity. A huge, high-roll butyl rubber surround controls longer cone excursion for high-impact bass with lower distortion. State-of-the-art laser technology centers the voice coil perfectly in the motor structure's magnetic field for optimized performance.

These high-impact subs feature a triple venting system for maximum air flow, power handling, and reliability. Gaskets on the front and the back of the basket insure an airtight installation. This subwoofer is designed for use in a small, sealed enclosure.

Don't limit yourself to only using these subs in your car — they've passed tough environmental testing that certifies them for marine use as well.

Priced per speaker

Product Highlights:

  • 8" 4-ohm subwoofer
  • metalized polypropylene concave cone with high-roll butyl rubber surround
  • non-resonant, heavy-gauge stamped steel basket
  • professional grade, nickel-plated, locking push terminals
  • power handling: 30-200 watts RMS
  • peak power handling: 400 watts
  • frequency response: 26-200 Hz
  • sensitivity: 85 dB
  • top-mount depth: 4-3/16"
  • sealed box volume: 0.35 cu. ft.
  • suitable for marine use
  • Recommended Q-Logic Box Type: 1
  • warranty: 3 years
  • Our 60-day money-back guarantee

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Polk/MOMO MM2084 Reviews

Average Customer Review:

18 reviews
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Nice Subs

Written By Branden, Columbus, OH on Friday, November 21, 2008

Crutchfield Customer Review (What's this?)

These subs are awesome, too bad they're discontinued. I put 2 of these in a 04 Crew Cab S-10. I got them in sealed boxes at 0.35 cu. ft. and I'm running them at 250 watt RMS each on a 1000 watt Kenwood 8104D amp. The subs sound great and easily have more than the two Kicker Comp 8s that they replaced. These subs may even be louder than two Kenwood 10s that I had running at 450 RMS each on a 1700 watt Kenwood 9102D.

Polk/MOMO MM2084

Written By no, atchison ks on Saturday, October 25, 2008

i put 2 of these in a 86 regular cab 4x4 in a custom box that i built with a 1000watt sony and they sound better then 2 10" stage 1 rockfords the only reason i didn't give them 5 stars is

1 the screws that come with them didn't have the special tool to install which was a real pain

2 the cut out you have to check because mine was way to big i'm just glad that i checked before i cut.

other then those 2 things i would recommend them to any body

Dual 8s Rule

Written By Jake, California on Sunday, October 05, 2008

Crutchfield Customer Review (What's this?)

All i gotta say is if you put two of these in two seperate ported boxes with .6 cubic feet and tune the port to 50 hz and feed them 250 watts each, you will go deaf.

When i first bought these i installed them in my single cab ranger in a sealed box and i thought they were bomb. eventually i got curious about ported boxes because i had read about how much better they can be than sealed boxes so i made some fitting the description above. THEY ARE SO LOUD. I parked my truck about 100 feet away from a house and pumped up the volume and went into the house and pictures on the wall and other various things were rattling and the bass is audible for LONG distances. Imagine how good it is in my single cab......

BUY THESE, NO QUESTIONS ASKED but keep in mind, having the right box is what brings out the bass.


Written By bberglundram, Altus, OK on Tuesday, September 16, 2008

WOW these subs pound really hard for 8's. I have them hooked up to an alpine amp 200 watts RMS wired at 2 ohms. I have them in my f150 supercrew. Highly recommend. Thanks again for the excellent support Crutchfield.


Written By Scott, Bellingham, WA on Saturday, August 02, 2008

Crutchfield Customer Review (What's this?)

These subs hit like a ton of bricks!!! Very hard hitting, no distortion, very accurate. I'm feeding them 250w ea from a Rockford Fosgate amp with the subs in a sealed .4 cubic foot box and they sound amazing. Highly recommended!!!

Polk/MOMO MM2084

Written By Scoob, Council Bluffs IA on Wednesday, May 28, 2008

Crutchfield Customer Review (What's this?)

Great sounding subs. At first I was a little apprehensive about going from a pair of 10" subs to a pair of these 8's. But I simply don't have room for a big box in the back of my Rubicon. After installing these in a down firing sealed box I was very impressed. Powered by a Kicker ZX300.1 makes for a hard hitting tight bass. They did take about a week to break in though. But they sound even better now then when I first installed them. I have a friend with a single 10" sub in the back of his wrangler and the dual 8's sound MUCH better.

Polk/MOMO MM2084

Written By frederick, brooklyn ny on Thursday, May 22, 2008

Crutchfield Customer Review (What's this?)

i bought this sub mainly to even out the bass in my 06 sonata. i hooked it up to a pioneer mono 300 watt amp and the amount of bass this sub gives is better than most 12 inch subs.i mounted it into a 8 inch bass tube ported and it kicks. definitely worth every penny.

Great sound

Written By Michael, Newark, DE on Saturday, March 29, 2008

Crutchfield Customer Review (What's this?)

I read a good number of reviews on several different subs and decided on the Polk based solely on what I had read. I was not disappointed at all. For such a small sub, it sure delivers the goods!!! Mounted it in the original enclosure in my 99 Explorer. It fit right in with only a minor modification to the enclosure. Driving it with a 150w Kenwood amp. It handles everything the system can give it. Deep, deep lows!!! Thanks Crutchfield!!!!!!

Very Dissapointed

Written By Glenn, Texas on Tuesday, January 15, 2008

Crutchfield Customer Review (What's this?)

I bought six of these to put behind the seat of my '07 GMC Crew Cab. I moved the seat forward 2 inches to accomodate the enclosure size required. I built the enclosure to Polk's specs and powered them with a DD Audio M3 which has the capability to put out well over 3000 watts RMS. I am hugely dissapointed in these subwoofers. In the recommended sealed enclosure they DO NOT play well below 45Hz, they are just plain anemic. Using a well know enclosure design program, I designed an enclosure using the supllied Thiele/Small parameters and the enclosure gave me a sealed box size of 4.3 cubic feet PER SUBWOOFER. For those of you that don't know...that's enough space for a PAIR of average 15's in sealed enclosures. I do not recommend these subs unless you plan to build a box much larger than recommended and give them less power in that box.

Power hungry subs...feed em like 10's

Written By Chris, Tampa, FL on Saturday, December 29, 2007

Crutchfield Customer Review (What's this?)

I recently purchased and installed 2 of these 8" subs from Crutchfield. I can't prove it but the second sub looked like a factory defect. It had a fair amount of glue residue squeezed out from between the cone and the surround. No big deal really because the speaker is fully functional. I installed the 2 8" subs in a sealed, polyfilled, .71ft enclosure that I custom made for the back left corner of my wifes 2006 G-35 coupe (Pain with the angles). Initially I tried using an Alpine MRD-M300 at 2 ohms, feeding each sub 150 watts; that wasn't nearly enough! I'm now going to purchase a Kenwood KAC-X10D and feed them 300 watts each.

As far as sound, I used the Bass Mechanic CD and the subs sound best in the 43-70 hz range, anything below that 43 hz and the 8's will require a low frequency bass boost to fill out.... maybe with more power and the 20 hours of break in time the subs will fill the lows a little better. If you love accurate deep bass I recommend a larger sealed enclosure, give each sub .50 ft3 each and they will offer a deeper, more efficient sound, yet still sound accurate.

BUY IT!!!!

Written By Curtis, Dallas, Texas on Monday, September 10, 2007

Crutchfield Customer Review (What's this?)

I used this in a custom enclosure for my '01 Cherokee and its mind-blowing how well such a small sub in an even smaller non-ported enclosure performs, sure you're not shaking the car next to you but the sound in yours is amazing, Mine performed wonderfully in a very small, closed enclosure and subs this small don't deal well in large ported ones which just makes it even more perfect for hidden enclosures like mine or small, space-saving boxes such as truck boxes. I did power it with the full 200 watts of its range and had it on a 125 hz crossover and the upper bass was perfectly tight, something which no large sub can boast without sucing up inane amounts of power, all in all another GREAT prodct from polk!

WOW. im louder then most 10s and some 12s

Written By parth, Florida on Monday, July 30, 2007

well let me start off by saying that it is the box that really makes the difference. Do not waste your time with prefabricated boxes from q logic or whatever. My box costs me less then the q logic ones and the advantages to building a box are definatly going to outweight the weekends worth of time it takes to build it...total working time for me is probably around 3-5 hours not including drying time. Simply buy some 2*4 MDF =8.00 Fiberglass =35.00 and some liquid nails=3.00...i first built my box and glued the edges with liquid nails and then poured fiberglass on the entire interior to get it airtight and really strong. I really think fiberglassing the inside of a box is important this is why my bass hits harder then a lot of 10s and 12s....give the box at least 24 hours to dry preferebly 48...o ya get a bass test cd and let these subs break in ...mines are still breaking in but STILL sound amazing....once they are broken in I KNOW I WILL HAVE A BANGIN SYSTEM...im running a pair of the MOMO components 6.5 in some custom kickpanels i fabricated and these to beuties are in the backseat armrest running off a alpine M450 amp. future plans include another set of MOMO compontent for custom rear enclosures and one 15 inch MOMO subwoofer dedicated to the LLOows.... I suggest letting them break in because it made the worlds of difference for my components MOMOS and these woofers have been known to blow within months if you dont break them in. Who cares if all your friends think they're bad because they are 8s and have never heard what they can do...2 weeks from that day u pulll up...they will think you got rid of them for 12s garrenteed...dont be mainstreat get POLK...quality product


Written By Antonio, San Diego on Saturday, June 23, 2007

just got my bandpass subwoofer box from crutchfiled , great quality product and i was amazed by the powerful bass this little unit delivers in my tiny nissan sentra, wow all can say is keep up the good work crutchfield.

Polk/MOMO MM2084

Written By Jim, Charlottesville, VA on Saturday, May 19, 2007

I bought my MM2084 four years ago, and it is still going strong. It started off in a sub box in the back of my old Volvo station wagon, where it delivered tight strong bass. After two years of direct sunlight every day, its high quality rubber surround has not even started to break down. Now hiding in a custom enclosure in the factory sub location of my new wagon, it still provides the tight base i heard when i bought it. Even though its only an 8 incher, it is versatile enough to provide the tight low end or the car-shaking rumble you want when paired with the correct amp and reciever. And did i mention that when you pair this baby with the MOMO grille it looks absolutely killer?

Polk Momo 8" in 02 Tahoe factory enclosure

Written By Blaine, Roberta, GA on Tuesday, May 15, 2007

Crutchfield Customer Review (What's this?)

I replaced the factory sub in my wife's 02 Tahoe with the 8"Polk MOMO sub and added a set of MB quart QSD216 components in the front door. The factory stereo did not have enough to efficiently push the sub so I added an older MTX amp I had lying around which did the job quite nicely. The sub performed well above my expectations, I could hardly believe that this little 8 incher was producing those lows. If you're looking for an eight inch sub, this one will not dissapoint. The Polk sub and Quart components yielded brilliantly clean sound.
Thanks for the great sub and good price.

Polk/MOMO MM2084

Written By Robert, Independence, Missouri on Sunday, October 08, 2006

Crutchfield Customer Review (What's this?)

After installing the Polk/Momo sub in my Silverado I came to realize that I had been missing the one componet that made the sound complete. This sub makes the job easier for the front db 6500's and the rear db 400's by bringing up the bass levels to a point where I could take some of the bass out of these speakers so they can work more efficiently on the mids and highs. Now this system has tons of headroom and the staging and dynamic range are starting to compete with my home system. Once again Polk Audio comes through with a speaker that raises the bar.

These little subs rock!!!

Written By Billy, Palm Bay, FL on Friday, August 18, 2006

Crutchfield Customer Review (What's this?)

I just installed two of these subs in a custom box behind the back seat of my Nissan Frontier Crew Cab. I am running them off an Alpine 400w sub amp and I can't believe the sound from these small subs. The bass hits hard and is super clean, tight and clear. No distortion. I have run 10's and 12's in the past so I really wasn't expecting anything super from these subs but I can say I am pleasantly surprised. I have always used Polk speakers because their sound quality is so good. Now I know first hand that their subs have that same perfect sound. Don't let the fact that these are just 8's scare you away. These are by far some of the best sounding subs I have ever heard. Thanks Polk!

Small size big performance

Written By Robert, Phoenix,Az on Sunday, May 14, 2006

I am doing an install on my Nissan Frontier Crew Cab and there is just not a lot of room behind the seat to work with. So I was forced to use an 8in sub on this application and I thought I wouldn't be able to get the performance I wanted. Wow, was I wrong. I choose the sub because of Polk's reputation and the ability to put the sub in a small sealed enclosure, a must for this application. The sub is wired to an Alpine MRP M350, an excellent amp, that is pushing 200 watts rms into 4ohms. I built a custom enclosure using Polk's recommendations. To say the least I am impressed. This Sub is super clean, hard hitting and a joy to listen to no matter what style of music you prefer. The bottom end on the sub is remarkable for such a small size and plays the lowest notes with ease, clarity, power, and precision. Another benefit is it's ability to sound good regardless the volume. From quiet mellow music to full volume rap this sub gives a solid performance all the way. My next step is to add a second sub and bring my amp up to its peak power of 350 watts rms into 2ohms. If you are looking for big, quality bass and don't have a lot of space, this sub is the perfect match. And with its reasonable price, you just can't go wrong.

Hands-on research

What's in the box?

Download owner's manual

  • One 8" subwoofer
  • 1 Rubber gasket (installed)
  • 8 Allen head self-tapping screws
  • Owner's Manual
  • Online registration sheet

Product Research

Enclosure Compatibility
Box Correction
Cutout Diameter Correction


Dynamic Balance: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Marine Certified: Polk/MOMO Series speakers are built to withstand exposure to moisture and UV rays, so they work well in boats and cars.

Metalized Polypropylene Woofer Cone: This woofer features an ultra-stiff metalized polypropylene Dynamic Balance cone for massive bass. Its Dish Cone design is mechanically supported by a unique Vented Cone Coupler. This support increases the sub's axial rigidity. 

Rubber Surround: The cone uses a durable, airtight rubber surround for a long life of extended linear motion.

Stamped Steel Basket: The acoustically inert stamped steel basket offers lower distortion.

NOMEX Spider: The huge, fire-retardant flat NOMEX spider allows extended linear motion while providing highly reliable mechanical and thermal stability.

Klippel Measurement Technology: State-of-the-art laser-based Klippel measurement technology perfectly centers the subwoofer's voice coil in the magnetic field, improving X-max and BL linearity, and the sub's micro and macro dynamics, for deep, precise bass.

Triple Vented: The vented coil/cone coupler, vented spider platform, and vented pole piece all allow cooling air to freely flow over the heat-generating components and better harness all the watts your amp can dish out.

Rubber Magnet Boot: The removable rubber magnet boot provides additional damping and deeper installation flexibility. With the magnet boot removed, the woofer has the following dimensions:

  • Magnet Diameter: 4.755"
  • Depth as top: 3.972"
  • Depth as bottom: 4.351"
Terminals: The woofer has professional grade nickel-plated push terminals that will accept bare wire and pin connectors.

Enclosure Compatibility

Recommended Sealed Box Volume: Polk recommends using this woofer in a sealed enclosure with an internal volume of 0.35 cu/ft.

Box Correction

Power Handling: The box incorrectly states that the woofer can handle up to 100 watts RMS and 200 watts peak. In fact, the woofer can handle up to 200 watts RMS and 400 watts peak.

Cutout Diameter Correction

Cutout Diameter Correction: Page 7 of the manuals included with the initial production runs of this woofer lists incorrect cutout diameter specifications; mounting holes cut using the specifications on page 7 will be too large for the woofers. The correct cutout specifications are listed on page 10 of the manual; on page 10, the cutout diameter is called "Mounting diameter".

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.