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Crutchfield

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.

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

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

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:

6 people say:

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Filter by rating:
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.
Was this review helpful?    Yes | No
 
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.
Was this review helpful?    Yes | No
 
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.
Was this review helpful?    Yes | No
 
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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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 ).