Polk Audio db521

5-1/4" 2-way car speakers

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Item# 107DB521

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Overview
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Category Info
Accessories

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.

Our take on the Polk Audio db521

by Leigh Schoettinger

Good music becomes great when you hear it through Polk's db Series car speakers. Polk engineers use laser imaging to determine the ideal combination of speaker materials and design to eliminate distortion. The resulting technology produces speakers with smooth frequency response, sharp detail, and the ability to play music at high volumes without strain.

Polk's db521 speakers feature 5-1/4" woofers made from a polymer/mica composite and durable rubber surrounds that won't fall apart under stress from heat, moisture, or time. Liquid-cooled 3/4" silk/polymer dome tweeters use powerful Neodymium magnets to deliver precise high-frequency reproduction, enveloping you in bright musical detail. And you can even pivot the tweeters, aiming them at your ears for improved stereo imaging. The built-in two-way crossovers keep the high and low frequencies flowing to the proper drivers for seamless, efficient audio.

The stainless steel mounting hardware is built to last, while the muscular ABS grilles will look great in your car's interior. Whether you've got a factory radio or an aftermarket stereo, these efficient speakers will spice up your daily drive.

See more info on this item

Highlights:

5-1/4" 2-way cars speakers (pair)
Dynamic Balance polymer/mica composite woofer with butyl rubber surround
3/4" pivoting liquid-cooled silk/polymer composite dome tweeter
Neodymium tweeter magnet
Kapton voice coil
built-in 2-way crossover network
ABS wheel-design grilles
stainless steel mounting hardware
power range: 4-45 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

Shop all Polk Audio 5-1/4" Speakers

Priced per pair

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

Features and specs chart | What’s in the box? | In-depth notes

Features and Specs

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

Product Research

What's in the box?

Download owner's manual

Two 2-way speakers
2 Grilles
8 Self-tapping screws (length=1")
8 Speed clips
Owner's Manual (Eng/Span/Fren/Ger/Ita/Port)
Online registration sheet

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

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.

Woofer Cones: Each speaker features a Dynamic Balance polymer/mica composite mineral-filled cone. The cones are stiff and lightweight for big sound and low distortion.

Butyl Rubber Surrounds: For a smoother response and improved durability, the woofers use butyl rubber surrounds.

Kapton Voice Coil Former: The low-mass two-layer 25mm Kapton Voice Coil former is lightweight for high sound output. Kapton's high melting temperature (725°F) ensures high power handling and longer reliability.

Silk/Polymer Composite Tweeters: The 3/4" liquid-cooled, silk/polymer composite tweeters provide clear, detailed highs. The tweeters use neodymium magnets.

Pivoting Tweeter: The tweeter pivots, allowing you to aim it toward your listening position for better imaging.

2-way Crossover Network: The built-in 2-way crossover network sends the appropriate frequencies to each driver for cleaner sound and better imaging.

Flat Spider: The speaker utilizes a flat spider for faster, longer excursion linear motion.

Pole Plate Heat Sink: The speaker's pole plate heat sink promotes better heat dissipation for superior power handling and reliability.

Woven Leads: The speaker features flexible woven leads sewn directly into the spider for greater reliability.

Basket: The speaker is housed in a solid, acoustically inert stamped steel basket finished in rustproof gun metal gray.

Grilles: Strong ABS plastic grilles are included. These computer optimized grilles are based on exclusive MOMO designs.

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Reviews for the Polk Audio db521

Average Customer Review:

45 people say:

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4 Star: (9)

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4 out of 5

Good

Written By Todd M, Alpharetta, GA on Friday, April 26, 2013

Crutchfield Customer Review (What's this?)

Good sound Quality, Would Purchase again

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5 out of 5

Nice speakers

Written By Kirk, Oroville, CA on Friday, April 26, 2013

Crutchfield Customer Review (What's this?)

Great speakers and easy to install with minimal customization in place of 4x6 old OEM speakers. Especially like the cross overs on the speaker itself,

Pros:

Sound good and quality construction

Cons:

with that i could change cross over settings, but could find any.

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4 out of 5

Polk Audio db521

Written By hockey guy, Northern California on Monday, March 11, 2013

Installed in a 1985 Chevrolet Corvette

Crutchfield Customer Review (What's this?)

nice cheap speakers, unfortunately, the bellows tore very easily during installation, but doesn't seem to affect the sound too much.

Pros:

cheap, reasonable sounding speakers

Cons:

better be super careful during installation because of the fragile bellows.

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3 out of 5

Pretty Good

Written By Anonymous, Baltimore, MD on Friday, March 08, 2013

Crutchfield Customer Review (What's this?)

These were to replace my blown rear speakers in my 1991 Jeep Cherokee. Its hard to tell if they're better considering that my old ones never worked. Installed really easily thanks to the wire harness that came with them.

Pros:

They were easy to install and work.

Cons:

I don't know if its my head unit or what but I have the bass turned way down but still get distortion when I turn them up. It bothers me but it could just be that my truck is old.

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5 out of 5

Good Replacement Speakers

Written By Dave, Round Rock, TX on Friday, March 08, 2013

Installed in a 2000 Jeep Wrangler

Crutchfield Customer Review (What's this?)

I purchased these speakers to replace the factory speakers in the soundbar. What a difference! First, they were easy to install with the wiring harness and easy instructions - maybe 40 minutes max (if I had better lighting, maybe 25 - 30 minutes). They sound tremendous and fit the bill for what I wanted. I used the soundbar's speaker covers instead of the covers that were supplied because I liked the appearance.

Pros:

Great sound. Economical. Easy to install.

1 out of 1 people found this helpful

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5 out of 5

Sound great

Written By Keith D, Cleveland Ohio on Monday, March 04, 2013

Installed in a 2011 GMC Sierra

Crutchfield Customer Review (What's this?)

Sounds goood

Pros:

Sounds great price was good

Cons:

None

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4 out of 5

Replacement Spks for 2006 Wrangler

Written By BSuber, Atlanta, Ga on Sunday, February 17, 2013

Installed in a 2006 Jeep Wrangler

Crutchfield Customer Review (What's this?)

Definitely sound better than the factory cardboard speakers; but they do make a cracking sound and are just radio quality. I also got duped by Crutchfield with their "Buy One Get One Half Off" bc Amazon sold them for less with no sale.

Pros:

Easy instructions for installation.

Cons:

Not as clear as the brand used to be. They crack and are very "treble-ish". I'm a 40 yr old woman, so I'm not trying to have a concert on wheelie.

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5 out of 5

Polk's are Perfect for 2003 Jeep TJ

Written By Todd, Connecticut on Sunday, October 21, 2012

Installed in a 2003 Jeep Wrangler

Crutchfield Customer Review (What's this?)

Before reading any further, if your Jeep, Truck or car does not have a sub woofer, the Polk Audio db521 speakers will leave you a bit wanting in the bass category. However, if you do have supplementary kick, then these are a great upgrade for the price, especially over the paper factory speakers and installation in the roll bar of my TJ was a breeze. Despite what the note suggests on Crutchfield's website and installation instructions, you CAN use the Polk Audio speaker grills instead of the original factory covers, which are a definite aesthetic upgrade.

Pros:

Great sound, especially mid and high Value for money Easy installation Speaker covers provide a nice visual punch

Cons:

Bass....but this really isn't a Con because it's only a 5.25" speaker. Be realistic with your expectations and you'll love these speakers.

6 out of 6 people found this helpful

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5 out of 5

Polk db521 5 1/4 speakers

Written By Adrian, Dixon, CA on Tuesday, August 14, 2012

Crutchfield Customer Review (What's this?)

I installed these in the bow of my boat. I had to go with 5 1/4 because that is what would fit. These speakers are a great addition to the four Polk db651s that are on the tower. I wasn't expecting much bass from these little speakers but I was pleasantly suprised. Now even the people in the front of the boat can rock out when we are traveling at top speed. (4 3/4 hole saw worked great for the holes!)

Pros:

Sound quality, size, marine certified, appearance

Cons:

None

2 out of 2 people found this helpful

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4 out of 5

Better than factory but not as good as I was hoping

Written By Elliott, Tampa, FL on Tuesday, July 31, 2012

Installed in a 1999 Jeep Wrangler

Crutchfield Customer Review (What's this?)

They replaced the 1999 factory speakers along with a Kenwood Excelon KDC-X796 head unit. Sound improved but didn't get the depth and clarity I was hoping for. Granted, these are small speakers but I was hoping for a better sound - maybe I was just expecting too much. Fair speaker and fair price.

Pros:

Clearer than stock speakers.

Cons:

No bass.

2 out of 2 people found this helpful

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5 out of 5

Polk Audio db521

Written By Anonymous, Huntington, CT on Sunday, June 03, 2012

Installed in a 1999 Jeep Wrangler

Crutchfield Customer Review (What's this?)

Sound great and easy to install!

1 out of 1 people found this helpful

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5 out of 5

Polk Audio db521

Written By Ramon, Doral, FL on Thursday, May 10, 2012

Installed in a 2006 Land Rover LR3

Crutchfield Customer Review (What's this?)

Excellent Product, Sound is clean .... I Installed on My Land Rover LR3 without problems. I Replaced OEM speaker and sound change 100%

Pros:

Great Sound with amplifier

Cons:

Nothing !!

1 out of 1 people found this helpful

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5 out of 5

Great

Written By Acura tls 2007, 43206 on Wednesday, May 09, 2012

Crutchfield Customer Review (What's this?)

This I a great speaker. Great sound and clarity. Just to let you know, it does fit the front door location for a 2007 Acura tl s type. I had to use a speaker ring bracket (included) to mount in baffle but very simple. Took 10 minutes. Crutchfield claims this won't work but it does

Pros:

Great highs and mids with about 40 watts rms

Cons:

None yet

1 out of 1 people found this helpful

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5 out of 5

Polk db 521, Great in My Harley.

Written By Mike B., Henrico County, Va. on Thursday, April 26, 2012

Crutchfield Customer Review (What's this?)

I bought these to replace the original speakers on my '04 Harley Electra Glide. The motor has 75k miles on it and the speakers were not doing good. Thanks to some friends I spoke with and the help from Crutchfield website and online help, I decided on these speakers. They were going in my motorcycle fairing and would be subject to rain so the marine rating is what I need. I do basically ride 12 months a year and I do occaisionally get wet. The speakers were installed this past weekend. I rode from Stafford, Va to my home near Richmond and was very surprised how well they work. For the first time on my motorcycle, I could hear music as it is intended, which I could not even when the motor was new. Only had the volume half way up and could hear them clearly at 70mph.(no headphones and half helmet) I tried many stations to include country, soul, r&r, talk show and even Bach. True I have only had them installed a couple days so we will see after a couple months on the road in sun AND rain. I can only imagine how they will sound when I update the radio.

Pros:

I heard the music as it was intended. The high background notes as well as the low. They fit the Harley fairing without any alterations or additional brackets.

Cons:

I heard noises and thought the motorcycle was acting up. After turning the radio on and off a couple times, I realized the tapping and all, was not the motor, but part of the music.

5 out of 5 people found this helpful

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4 out of 5

Great Speaker Awful bracket - 2007 Civic EX

Written By rmc, Phoenix, AZ on Friday, December 23, 2011

I bought these speakers to compliment my db651 speakers for my 2007 Honda Civic EX. The front door speakers were pretty simple to install and were great sounding so I decided to purchase these for the rear speakers. The only issue I have with them is that installing the rear speakers should have been about a 10-15 minute job, but it turned out to be 1.5 hours+ due to the brackets that crutchfield shipped with these: model # 142 SAC656 - these are complete garbage and do not fit well at all. You have to snap off the edges and remove the screw threader that is already in place. The customer service rep was very helpful and helped me get started, but if they just would have shipped the same style bracket that I got with the 651s this would've been cake.

The speakers themselves sound great so far though.

Pros:

Sounds great, decent price.

Cons:

Mounting Brackets

1 out of 1 people found this helpful

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4 out of 5

2002 Jeep Wrangler

Written By Sumo, Annandale, VA on Wednesday, September 07, 2011

Installed in a 2002 Jeep Wrangler

Crutchfield Customer Review (What's this?)

I replaced the stock speakers in my dash and sound bar with these Polks. They are powered by the head unit only (Pioneer DEH-33HD) and are loud enough when I'm at speed with the top up. I would recommend them for anyone who wants to do a speaker upgrade in their car. I mainly listen to heavy metal, rock, rap, and talk radio. These speakers are fine for that.

6 out of 6 people found this helpful

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5 out of 5

Great rear fill speakers

Written By Blaine, Louisiana on Monday, September 05, 2011

Crutchfield Customer Review (What's this?)

I am using these as rear fill speakers in a 99 Mustang GT. They are powered by a Boston Acoustics GTA-504 amp. I do not need bass from these...that's what subwoofers are for. They sound smooth and clear just how I expected them to. Great product.

2 out of 2 people found this helpful

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4 out of 5

Wrangler - Good As expected

Written By Frank M., Atlanta, GA on Friday, August 26, 2011

Crutchfield Customer Review (What's this?)

Installed incredibly easy into my 2003 Jeep Wrangler - Front and Top Bar. Sound is a definte improvement over stock speakers, but lack base as expected due to their size. Once I replace the subwoofer, this should be a pretty decent system - especially for the cost and time involved to upgrade. Would recommend as a great stock replacement.

4 out of 4 people found this helpful

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3 out of 5

Just okay

Written By Chris, WV on Friday, July 08, 2011

Installed in a 1999 Jeep Wrangler

Crutchfield Customer Review (What's this?)

To be honest I wasn't blown away by these speakers. I installed two in the soundbar and with a little modification, two in the dash of my 1999 Jeep Wrangler. I bought them because my dash speakers were blown. I did a comparison when the left soundbar speaker was installed and the right was still factory. I didn't think there was that much difference to be heard which was pretty surprising considering the factory speakers are cardboard.

Of note to other wrangler owners: The biggest difference I heard was after I put poly fill in the soundbar. With either the factory or the Polks.

5 out of 6 people found this helpful

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5 out of 5

Excellent choice for Jeep Wrangler

Written By Mike, Hudson, Ohio on Thursday, June 16, 2011

Installed in a 2005 Jeep Wrangler

Crutchfield Customer Review (What's this?)

With the help of the folks at Crutchfield I paired these up with the Polk db421's in the dash along with a Bazooka BTA8100 8" 100 Watt Powered Sub behind the rear seat. I also replace the head unit with the Kenwood KDC-X395 CD Receiver. The system sounds great. I have a nice full sound at an awesome price.

I did NOT use bass blockers as some have commented about because the receiver actually allows you to specify the frequency that is is passed to each speaker. The polks have great mids and highs and the bass tube fills in the lows perfectly. This is an excellent combo.

5 out of 5 people found this helpful

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All mechanical and electrical failures covered, includes normal wear and tear.

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Rated 5-stars by consumers

For a more in-depth review and enhanced detailed information on the Polk Audio db521, please visit the Crutchfield website product page (/S-oIfwrvsFaVp/p_107DB521/Polk-Audio-db521.html ).

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Polk Audio db521

5-1/4" 2-way car speakers

Item# 107DB521 offer details

Review Summary

By buying this product you'll earn up to 90 Rewards points.

Why replace your car's original speakers?

Our take on the Polk Audio db521

by Leigh Schoettinger

Highlights:

Shop all Polk Audio 5-1/4" Speakers

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

Features and Specs

Product Research

Our Product Research Team

Features

Product Reviews

Reviews for the Polk Audio db521

Average Customer Review:

Review this product:

Crutchfield Video Review Guidelines

Filter by rating:

Good

Nice speakers

Polk Audio db521

Pretty Good

Good Replacement Speakers

Sound great

Replacement Spks for 2006 Wrangler

Polk's are Perfect for 2003 Jeep TJ

Polk db521 5 1/4 speakers

Better than factory but not as good as I was hoping

Polk Audio db521

Polk Audio db521

Great

Polk db 521, Great in My Harley.

Great Speaker Awful bracket - 2007 Civic EX

2002 Jeep Wrangler

Great rear fill speakers

Wrangler - Good As expected

Just okay

Excellent choice for Jeep Wrangler

Accessories

Add accessories for the Polk Audio db521

Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car. See all categories & accessories

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