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Polk Audio DB521 5.25-Inch Coaxial Speakers (Pair, Silver)

4.5 out of 5 stars 257 customer reviews
| 27 answered questions

Price: $79.99 & FREE Shipping

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  • 5-1/4" 2-way Speakers (Marine Certified)
  • Power Handling: Peak: 275 watts per pair / 135 watts each & RMS: 90 watts per pair / 45 watts each
  • Dynamic Balance polymer/mica composite mineral filled cone is stiff yet lightweight for big sound and little distortion
  • 19mm liquid-cooled silk/polymer composite dome tweeter with neodymium magnet for clear and detailed highs
  • Multi-hole mounting pattern and shallow depth for easy drop-in installations in most cars
  • Pair of marine certified speakers perfect for use in boats of all types
  • Equipped with a 0.75-inch liquid-cooled silk-polymer composite dome tweeter
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$79.99 & FREE Shipping In stock. Usually ships within 2 to 3 days. Ships from and sold by Crutchfield.

Frequently Bought Together

  • Polk Audio DB521 5.25-Inch Coaxial Speakers (Pair, Silver)
  • +
  • Polk Audio DB651 6.5"/6.75" 2-Way Marine Certified db Series Car Speakers with Liquid Cooled Silk Tweeters
Total price: $146.48
Buy the selected items together

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This item: Polk Audio DB521 5.25-Inch Coaxial Speakers (Pair, Silver)
Customer Rating 4 out of 5 stars (257) 4 out of 5 stars (787) 4 out of 5 stars (64) 4 out of 5 stars (148)
Price $79.99 $66.49 $73.94 $40.98
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Crutchfield JB Tool Sales S E INTERNATIONAL Googol Shop
Vehicle Speaker Size 5.25 inch 6.5 inch 5.25 inch 5.25 Inch
Wattage 45 Watts 60 Watts 165 Watts 70 Watts
Add to Cart Add to Cart Add to Cart Add to Cart

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Product Description

Product Packaging: Standard Packaging

Step up your vehicles audio performance with Polk Audio's revolutionary db521's. Cutting edge technology has allowed for an efficient speaker that has ability to accurately reproduce music like you have never heard before. A precise balance of materials including the Silk/Polymer Dome tweeter and Mica Cone woofer enable smooth roll-off and quick response at any volume. The rubber surround adds to bass response as well as increases the lifetime of the speaker under any conditions. Being marine certified, the Polk DB521's will surprise you with its versatility and ability for use in many applications. The high-efficiency loudspeaker means less power is necessary for the same quality output. The revamped db Series delivers that perfect Polk Audio performance and durability like never before.

Product Information

Product Packaging:Standard Packaging
Product Dimensions 8 x 14.5 x 4.8 inches
Item Weight 5 pounds
Shipping Weight 4 pounds (View shipping rates and policies)
ASIN B000P0PF8C
Item model number DB521
Batteries 1 12V batteries required.
Customer Reviews
4.5 out of 5 stars 257 customer reviews

4.5 out of 5 stars
Best Sellers Rank #68 in Electronics > Car Electronics > Car Audio > Speakers > Coaxial Speakers
Discontinued by manufacturer Yes

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Customer Reviews

Top Customer Reviews

Package Type: Standard Packaging
From the moment I took them out of the box I was impressed. Nicely stamped steel basket of quite sturdy material with a high quality rubber surround and poly cone. After putting them into the "custom" holes in the door panels of my '88 Jeep Wrangler and hooking them to the head unit I fired them up and was completly Blown Away! The highs are crisp and oh so clean, the mids make sax's sound like sax's and guitars sound like guitars, the mid bass kick is nice and solid with not-a-speck of mushiness. But it's the tweeter thats the killer in this unit for sure. It just sings! The crash of cymbals is so natural and clean, female voices, everything just sounds so natural coming out of these beauties.
And talk about "attack", it's here in spades. Try cranking up Hendrix's "Machine Gun" and see if all the little hairs on the back of your neck don't just stand straight up!
Now, all I have them powered by is the head unti at this point, a full 7 watts or so I imagine, and trust me when I say the head unit amp gives out long before the speakers do. The db's just play louder and louder until the amp begins to distort, all the while showing no sign of distortion themselves. They cry to be driven by a good powerful amp!
This is the first speaker I have ever had in my Wrangler in the 19 years or so that I have been driving it that can play loud enopugh to be heard over the wind on the highway! Just love these babies and can't wait to get more! Maybe the 4x6 for the dash spots?
P.S. These speakers would dovetail very nice with a good subwoofer. They sound nice and tight down to their limit.
P.P.S Bolt these speakers down TIGHT ! They are serious air moving pistons and they will shake like crazy. I suggest something metal!
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Package Type: Standard Packaging
I recently installed these on my motorcycle and I am pleased with the performance as well as the price. They have great range and handle the power of the receiver very well.I would recommend these to anyone.
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Package Type: Standard Packaging Verified Purchase
I purchased these for me Stratoliner Deluxe batwing fairing. They fit perfectly, no modifications. They sound much better than stock. I needed a very efficient speaker with the weak amp they put in these cycles and with 93 db they fit the bill.
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Package Type: Standard Packaging Verified Purchase
I bought these for my 2000 Jeep Wrangler Sahara. They fit perfectly in the sound bar. They have been rained on several times and still play and sound fantastic. I couldn't be happier with them!
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Package Type: Standard Packaging Verified Purchase
My new-to-me 2006 Jeep Rubicon Unlimited came with the optional factory speakers - a sub-woofer and improved front speakers (and maybe improved roll-bar speakers). I thought the factory sound system did not sound very good (and I'm not an audiophile) and it was hard to hear while driving (we have a soft top.)

I replaced the factory sub woofer (that lives in the center console) with a Bazooka speaker, and that immensely improved the low end sound, apparently the factory sub was very sick (not an uncommon situation it seems.) Then I pulled the factory radio and installed a Pioneer head unit and after adjusting the audio parameters, the sound was much better.

Then I replaced the front speakers with these Polk's. After hooking them up and giving them a try, I was very disappointed with the sound quality and thought they didn't sound any better than the optional Jeep speakers (actually I thought they sounded worse) - the speakers had way too much low and mid-range response. Noting that the front Jeep speakers used a high-pass filter (a bass blocker), I moved the filters to the Polk's and now the speakers were properly tuned to the sound system and after some tweaking of the Pioneer's audio parameters, the system sounded quite good. These Polk's are okay, but in all honesty I did not gain much audio quality improvement over the optional Jeep front speakers. The Polk's sound perhaps a little crisper. If you were replacing the standard oval Jeep speakers for these, I suspect there would be a significant improvement in sound quality.

For my Jeep with the factory optional speakers, replacing the factory sub and head unit was the biggest bang for the buck. If you have the standard speakers, adding a kicker and replacing the front/rear speakers would be a great plan.
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Package Type: Standard Packaging Verified Purchase
I bought these speakers to replace some crappy stock speakers on my 2011 Kawasaki vaquero 1700. They fit in the existing speaker holes just perfect and we're slim enough to not interfere with the speak grills. Mounted up perfect and look great. I also installed a small Alpine power pack amplifier to help drive these speakers and they sound leaps and bounds better then the stock kawi speakers. They make a noticibly huge difference. When the bike is parked they flat out rock and sound way clearer and louder then before. However when I get going down the freeway at normal cruising speed (60-70 mph) they do loose a lot of sound. Don't get me wrong they still sound good but I don't know if there is any 5 1/2 speaker out there that will do what all of us would like them to do at those speeds. By design they are just not big enough to compete with the wind and road noise. Like I said before they sound clear but can't handle much bass at all. Again by design they shouldn't. Overall they are nice and better then stock and we'll worth the price. Just don't expect them to handle R&B or Rap music at high volumes. Rock and that type of music they do much better with. Hope this helped someone out there. ;)
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