Polk Audio DXi521 (DXi 521) db521 inspired Car/Marine/ATV Speakers

5-1/4" DXi Series 2-way Car Speakers, Marine Certified for Boats/ATV/Motorcycles - Same Performance as DB521

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List price $99.99

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$39.99

with warranty A Pair

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Arrives by Wednesday, Dec. 20 to zip 20147

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Bundles with this Product

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Get 25% off a Set of Stinger F.A.S.T. Rings with Purchase!

Reduce panel vibration, increase mid bass, reduce destructive waves, and get better sound! The F.A.S.T. Rings Kit help to focus all the sound into the cabin, bringing out the full potential of your speakers. This offer cannot be combined with any other coupons or offers.

5.00

112445

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Polk Audio DXi521 (DXi 521) db521 inspired Car/Marine/ATV Speakers

$39.99

+

25% OFF

Roadkill 5" and 5.25" FAST Rings (RKFR5)

$19.99

Special Price $14.99 ($19.99 if purchased separately)

Roadkill 5" and 5.25" FAST Rings (RKFR5)

• F.A.S.T. Ring Kit for 5" and 5.25" Speakers
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(Offer 1 of 1)

Combined Total Price

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Polk Audio Store

Polk Audio DXi521: Clean and Precise Sound


Polk Audio DXi521 Car Speaker


Klippel Motor Optimization:

The DXi521 is made with laser measurement technology via the Klippel Motor Optimization for a smooth excursion path at any volume. This creates a more efficient and long lasting speaker that performs great at low or high volumes. This model is equivalent to the popular db521.





Polk Audio DXi521 Car Speaker


Proprietary Dynamic Balance Technology:

Polk's engineers are able to design out driver and system resonances that cause distortion with the Dynamic Balance technology. The composite cones also feature a stiffness-to-mass ratio that allows the speakers to react to faster transients with finer detail. You not only get clarity, but function and precision.






What does Marine Certified mean?

The DXi Series speakers go through the ASTM (American Society for Testing and Materials) marine testing to become marine certified. The speakers go through two harsh tests: the B117-03 Standard Practice for Operating Salt Spray (Fog) Apparatus and the D4329-99 Standard Practice for Fluorescent UV Exposure of Plastics. The Salt Fog tests exposes the components 95° Fahrenheit and 5% salt solution for 500 hours and the UV test puts the speakers through 8 hours of UV-B light, black body temperature of 60 degrees Celsius and 4 hours condensate water, black body temperature of 40 degrees Celsius. These tests ensure these speakers will last in the harshest of marine environments.





General Features:

  • 5-1/4" DXi Series 2-way Coaxial Car Speakers
  • Power Handling:
    • Peak: 270 watts per pair / 135 watts each
    • RMS: 90 watts per pair / 45 watts each
  • Recommended Power Range: 2 - 45 watts RMS per channel
  • Dynamic Balance polypropylene cone
  • Butyl Rubber surround
  • 3/4" (19mm) aluminum dome tweeter
  • Top-mount Depth: 2 5/16"
  • Cutout Dimensions: 4 3/4"
  • 4 ohm impedance
  • Frequency Response: 60Hz-22kHz
  • Sensitivity: 93dB
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

  • Priced Per Pair

Check out the DXi521 Owner's Manual



Speaker Specifications

Series
This is the manufacturer product line of speakers.
DXi (Polk)
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Pair
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
5-1/4"
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Size
Refers to the size of the tweeter. Typically, smaller tweeters produces less output with higher frequency response.
3/4"
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Aluminum
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Dynamic Balanced polypropylene
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
135 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
45 watts
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
93 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
60 - 22000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
2 5/16"
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches, required to contain the speaker.
4 3/4"

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
75%
4 Star
0%
3 Star
13%
2 Star
13%
1 Star
0%

Average Attribution Rating

Durability
4.4
Value
4.5
Features
4.3
Design
4.5
Usability
4.5
Ryan

Mount Vernon, Texas

Overall
Durability
Value
Features
Design
Usability
Great!

July 19, 2017

Very solid product for the price. Would recommend to anyone.

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gator

va beach, va

Overall
Durability
Value
Features
Design
Usability
Great value

May 22, 2017

I bought many of the polk speakers over the year , best all around sound great up grade over a stock speaker , and work great with an amp. would and have bought over and over.

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Gregory

Glendale, AZ

Overall
Durability
Value
Features
Design
Usability
Good Speakers

May 11, 2017

Good sounding speakers that are easy to install. They also look much better than the speakers replaced.

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Ben

Visalia, CA

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
ok for rear fill

May 7, 2017

I bought these because the ones we bought for our Mazda 6 sounded great (they were 6.5)... this pair paled in comparison. They sound ok as rear fill when singled out but that's it I wouldn't rely on them for much more than that. Given their size and rating I expected more butt should have known better. Either way hard to beat for the price. Would I buy them again probably not. Next time I'll buy a set of 6" mid basses and make them work.

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Sean

Surgoinsville, TN

Overall
Durability
Value
Features
Design
Usability
Good speakers

April 15, 2017

Good set of speakers, especially for the money. I installed them in a 2015 Indian Chieftain teplacing the stock speakers. There is no comparison now, these speakers made a vast improvement.

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Wes

Fergus Falls, MN

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Polk Audio DXi521

December 27, 2016

Trued Polk quality at a very affordable price. Sound surprisingly good.

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Raymond

San Antonio TX

Overall
Durability
Value
Features
Design
Usability
Sound good

November 7, 2016

These speakers sound very good. I used them for a boombox project and they sound really good, couldn't ask for more. People say they have no bass but they have bass you would expect from a 5 inch speakers. Bass won't disappoint you. You won't regret buying these speakers. That's coming from someone who is picky.

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jason

flint, MI

Overall
Durability
Value
Features
Design
Usability
clean and crisp

June 30, 2016

sound is clean, clear and crisp. for the price im shocked at how good they sound

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Accessory Tools and Products

Accessories added

Streetwires 50 ft. of True Spec 16 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $24.99

Belva 23 ft. of True Spec 16 Gauge Speaker Wire

100% Copper Clad Aluminum, PVC blended jacket for easy installation and high strand count for maximum audio quality

Your Price $12.99

Encore Universal Four Door Power Door Lock Kit

Add Power Door Locking and Unlocking while you have the Door Panels removed

Your Price $24.99

NVX Sound Dampening Rubber Roller

Install your Sound Dampening with ease using this heavy duty rubber roller!

Your Price $7.99

Speaker Baffles for your Speakers

Enhance the sound of your speakers with these easy to install speaker baffles.

Your Price $9.99

5" to 5-1/4" Round Foam Speaker Baffles

Creates a tight, acoustic seal behind the speaker to enhance the sound quality.

Your Price $8.99

16-14 AWG Butt Connectors

These blue butt connectors are ideal when connecting thicker speaker wire your new aftermarket speakers!

Your Price $6.99

16-14 AWG Quick Disconnect Connectors

These blue quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $6.99

Browse 1 question and 25 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Close to OME
michael d on Aug 9, 2017
A friend of mine install these in he bike and the sound great
Charlie R on Jul 26, 2017
I wanted an inexpensive speaker to replace the stock paper speakers in my old Honda Civic
William B on Jul 31, 2017
Great speaker for low wattage install or replacement
barry r on Jul 11, 2017

Product Summary

Manufacturer

Model Number

DXi521

Weight

4.50lbs

Internal SKU

dxi521

Internal Product ID

112445

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Polk Audio DXi521 (DXi 521) db521 inspired Car/Marine/ATV Speakers

Item Added to Cart

Polk Audio DXi521 (DXi 521) db521 inspired Car/Marine/ATV Speakers

5-1/4" DXi Series 2-way Car Speakers, Marine Certified for Boats/ATV/Motorcycles - Same Performance as DB521

$39.99

Keep Shopping

Streetwires 50 ft. of True Spec 16 Gauge Speaker Wire

You need speaker wire to connect your speakers!

$24.99

Add
Encore Universal Four Door Power Door Lock Kit

Add Power Door Locking and Unlocking while you have the Door Panels removed

$24.99

Add
NVX Sound Dampening Rubber Roller

Install your Sound Dampening with ease using this heavy duty rubber roller!

$7.99

Add

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