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Polk Audio DXi521

5-1/4" 2-way car speakers

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Our take on the Polk Audio DXi521

by John Pollard
Polk Audio

Why replace your car's original speakers?

The speakers that originally came in your car were made from inexpensive materials, designed to create acceptable sound at the lowest possible cost to the manufacturer. If you love music, you deserve better. Name-brand aftermarket speakers deliver fuller, richer sound with considerably more detail and nuance, and they're capable of playing louder and cleaner than factory speakers. Connect new speakers to your factory radio and you'll get the best possible sound from your dealer-equipped system. Pair them up with a new car stereo for a level of enjoyment that can rival a high-fidelity home audio experience.

Enjoy your music even more

Go ahead, circle the parking lot till your favorite song is over. Polk Audio's DXi Series speakers will make you want to hit "repeat" so you can hear it all over again. Polk uses a high-tech approach and ideal materials to give your tunes an exciting new edge.

Precision woofers showcase your music

The DXi521 speakers feature 5-1/4" polymer composite cones that are lightweight and stiff, so they can create a big sound with minimal distortion. Polk analyzes their drivers in motion to ensure that cone movement is even and precise. Polk also uses laser imaging to craft woofer cones that are perfectly balanced to resist distortion-causing resonances.

Read more

Polk Audio DXi 521

Aluminum dome tweeters broadcast detailed sound

Each 3/4" aluminum dome tweeter brings out the high-frequency highlights in your music, so you'll hear every detail of your most enthralling musical moments. From an intensely quiet acoustic pluck to the most exhilarating electric solo, it'll be a very entertaining ride.

Highlights:

  • 5-1/4" 2-way cars speakers (pair)
  • polymer composite woofer with butyl rubber surround
  • 3/4" aluminum dome tweeter
  • power range: 2-45 watts RMS (135 watts peak power)
  • frequency response: 60-22,000 Hz
  • sensitivity: 93 dB
  • top-mount depth: 2-5/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
General
Design 2-way
Tweeter Design 3/4" Dome
Tweeter Composition Aluminum
Woofer Composition Bi-Laminate Composite
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Specifications
Sensitivity 93 dB at 1 watt
Frequency Response 60 - 22k Hz
RMS Power Range (Watts) 2-45
Peak Power Handling (Watts) 135
Impedance (Ohms) 4
Top-mount Depth (Inches) 2 5/16
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 4 11/16
Product Research
What's in the box?

Download owner's manual

  • Two 2-way speakers
  • 2 Grilles
  • Eight 1" Self-tapping screws
  • Eight 3/8" Self-tapping screws
  • 8 Speed clips
  • Owner's Manual (English/ Spanish/ French/ German/ Italian/ Portuguese)
  • Online product registration information

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.

Features

High Efficiency Design: The Polk Audio DXi Series speakers feature a high efficiency design; meaning better sound and more volume using less power.

Dynamic Balance Driver Technology: 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.

Klippel Optimized Components: For a driver to reproduce complex sounds accurately, the cone must move exactly the same distance and manner in both directions. The Klippel distortion analyzer, a device that uses a laser and sophisticated software to do large-scale analysis of drivers in motion, lets Polk optimize the speaker's motor structure, voice coil alignment, and suspension to yield the best possible performance.

Composite Cones: Each speaker features a Dynamic Balance, Bi-Laminate composite, polypropylene cone woofer. These composite cones feature tremendous stiffness-to mass ratio, resulting in faster transients and finer detail.

Rubber Surrounds: For a smoother response and improved durability, the speaker uses rubber surrounds.

Aluminum Dome Tweeters: Each speaker features a 3/4" aluminum dome tweeter for clear, accurate highs. Once the speakers are mounted, the tweeters can be tilted (approximately 25°) for optimum imaging.

 
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Polk Audio DXi521 Reviews

Average Customer Review:

13 people say:

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Filter by rating:
5 out of 5

Great Speakers

Written By Jim, New Paltz, NY on Wednesday, October 01, 2014
 
Speakers sound crisp and clear at low and high volumes
Pros:
Affordable, big improvement over factory speakers, easy to install instructions
Cons:
Nothing to do with the product, but be patient trying to install speakers above your head in a Jeep sound bar.
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2 out of 5

2000 Jeep Wrangler

Written By Justin, Denver, CO on Tuesday, September 16, 2014
Crutchfield Customer Review (What's this?)
 
Overall this speaker was an improvement to the sound quality from the factory model but at 14 years old anything would have been. After being installed for one week I would say that I'm not 100% satisfied and question my purchase. I noticed the price drop over the last 6 months with these speakers and should have taken that as a warning sign.
Pros:
Improvement to the clarity. Crutchfield as always is great to work with and provides everything you need to make it work. Price
Cons:
Can not use the covers it comes with. Any type of bass seems washed out and dull.
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4 out of 5

Jeep Speaker Replacements

Written By Rewards Card Reviewer, Key Largo, FL on Tuesday, September 09, 2014
Crutchfield Customer Review (What's this?)
 
All four 5.25"s swapped right into my 98 TJ, two dash and two soundbar. Crutchfield sent the appropriate wiring harnesses and 4x6 - 5.25" adapter for the dash; while nothing was needed for the soundbar, they sent two extra harnesses plus all hardware.
Pros:
Everything needed, plus some Competitive price Marine grade
Cons:
Polk grills didn't work out, but I don't like advertising anyway Top and doors are always off so I won't fully appreciate the sound
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4 out of 5

Good buy for the price

Written By gunmetalRED, Toledo, OH on Friday, July 25, 2014
Crutchfield Customer Review (What's this?)
 
I bought these to replace the blown front speakers in my '98 Buick Riviera and am quite happy with them. The materials and build quality felt very nice putting them in and they fit nice and flush under my factory grilles. They get nice and loud and remain clear even with my factory stereo. The bass response is OK, much better than other brands in this price range I have used, but I didn't expect them to be show-stoppers at this price. Great for highway cruising volume. I'll probably replace the rears with the matching 6"x9"s and I'm sure an aftermarket stereo would give them some nice punch. Great performance for a little money.
Pros:
Price, build quality, clarity
Cons:
None
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1 out of 5

Just As Bad as the DXi721

Written By CQLink, Detroit on Wednesday, July 23, 2014
Crutchfield Customer Review (What's this?)
 
These speakers sound muddy and dull. I installed an Alpine KTP-445U Head Unit Power Pack and it didn't help much. These are simply poor sounding speakers with virtually no bass response. Highs don't sound much better.
Pros:
None.
Cons:
Dull sound even with an amplifier.
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5 out of 5

Vulcan Vaquero gets an upgrade

Written By chuck, TN on Tuesday, May 20, 2014
Crutchfield Customer Review (What's this?)
 
These were recommended as a replacement for the factory speakers in my Kawasaki Vulcan Vaquero. The clarity has improved a lot, next will be installing an Alpine 445 amp so they can truly reach their potential. Thanks Crutchfield
Pros:
Good clarity....Marine grade....awesome price
Cons:
None
1 out of 1 people found this helpful
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4 out of 5

Polk Audio DXi521

Written By JonathaninRichmond, Richmond, Va on Sunday, April 27, 2014
Crutchfield Customer Review (What's this?)
 
These speakers fit my 2002 caravan great. There is a small clearance problem with the rear panel speakers which are just over the cup holders for the rear most bench. The center horn of the speaker is pressing against the plastic body panel, but we'll let time tell if that's a problem or not. The sound is great and installation was relatively simple.
Pros:
Sound quality, ease of installation
Cons:
Size - But that's only due to the vehicle I'm installing them on
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4 out of 5

Speakers

Written By Paul, Greencastle, IN on Monday, March 10, 2014
Crutchfield Customer Review (What's this?)
 
Sounds great for my needs
Pros:
Sounds great
Cons:
Grills did not fit my soundbar on Jeep Wrangler. Had to use old ones.
1 out of 1 people found this helpful
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5 out of 5

Polk Audio DXi521 speakers

Written By Miike, Winston-Salem, NC on Wednesday, January 01, 2014
Crutchfield Customer Review (What's this?)
 
I'm very happy with the sound and ease of installation. The Crutchfield team was very helpful in my decision process.
Pros:
They sound better than the old speakers.
Cons:
I had to install said speakers myself, what a drag.
1 out of 1 people found this helpful
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5 out of 5

Good upgrade

Written By Deggy, Deforest, WI on Thursday, November 14, 2013
Crutchfield Customer Review (What's this?)
 
I used these in the dash of my 2005 Jeep Wrangler. I had to find a special bracket to upgrade to this size (standard is 4" or 4x6). They sound great compared to stock. It powered by a Kenwood Excelon KDC-X797 CD Receiver. The upgrade in size is much better and gives better bass and treble response.
Pros:
Good value. Good sound.
2 out of 2 people found this helpful
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4 out of 5

Happy Customer

Written By M.E. Best, Charleston, SC on Wednesday, September 11, 2013
Crutchfield Customer Review (What's this?)
 
These speakers compliment the Polk DXi 651 speakers I installed earlier< I am very happy with the Polk Audio products, I am certain that they will serve me very well for years to come.
Pros:
Compliments my other Polk Audio speakers with quality sound at a very competitive price.
Cons:
None.
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4 out of 5

Polk Audio DXi521

Written By TimH, Ketchum, ID on Friday, August 02, 2013
Crutchfield Customer Review (What's this?)
 
Nice little set of speakers. Well built with solid grills. I installed them in my boat with the Kenwood KMR-355U receiver unit, and am enjoying the upgrade.
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4 out of 5

Nice Sound, worth the upgrade

Written By Mack, Harrisonburg,Va on Saturday, July 27, 2013
 
Just purchased a 2012 Jeep Wrangler without the upgraded sound system. The stock speakers were lousy. I upgraded the speakers in the sound bar first. A week later I had to upgrade the speakers in the dash. I left the stock head unit. I put the Polk's in the front panels. Speakers sound great. No more muddy bass. The install took awhile, but that is because it is a Jeep. Sounds good with the stock head unit. Big, big difference.
Pros:
Sound great. Good overall sound.
Cons:
Difficult install in a 2012 Jeep Wrangler. Not the speakers fault. -- Jeeps fault.
1 out of 1 people found this helpful
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1 question already asked

are these speakers bi ampable? [ mr  May 27, 2014 ]
2 answers
  • I'm sure they could be modded to be biampable, but out of the box, no. [ TOM   May 28, 2014 ]
  • They only have one positive and negative connection on the back for the whole speaker... There isn't a separate connection for the tweeter. Not sure if that helps or not. [ Brian   May 28, 2014 ]

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For a more in-depth review and enhanced detailed information on the Polk Audio DXi521, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107DXI521/Polk-Audio-DXi521.html ).