---
product_id: 1158528
title: "DB521 5.25-Inch Coaxial Speakers (Pair, Silver)"
brand: "polk audio"
price: "VT33929"
currency: VUV
in_stock: true
reviews_count: 13
category: "Polk Audio"
url: https://www.desertcart.vu/products/1158528-db521-5-25-inch-coaxial-speakers-pair-silver
store_origin: VU
region: Vanuatu
---

# Marine certified for all-weather use 19mm liquid cooled silk/polymer tweeter 275W peak power per pair DB521 5.25-Inch Coaxial Speakers (Pair, Silver)

**Brand:** polk audio
**Price:** VT33929
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your ride’s vibe with Polk’s marine-grade sonic power!

## Quick Answers

- **What is this?** DB521 5.25-Inch Coaxial Speakers (Pair, Silver) by polk audio
- **How much does it cost?** VT33929 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/1158528-db521-5-25-inch-coaxial-speakers-pair-silver)

## Best For

- polk audio enthusiasts

## Why This Product

- Trusted polk audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy Installation:** Shallow depth and multi-hole mounting pattern fit most cars and boats effortlessly.
- • **Dynamic Balance Cone:** Polymer/mica composite cone offers big sound with minimal distortion for a premium listening experience.
- • **Powerful Sound Output:** Delivers up to 275 watts peak power for immersive audio clarity.
- • **Advanced Tweeter Technology:** Liquid cooled silk/polymer dome tweeter ensures crisp, detailed highs at any volume.
- • **Marine Certified Durability:** Built to withstand extreme temperatures and sunlight—perfect for boats and vehicles alike.

## Overview

The Polk Audio DB521 5.25-inch coaxial speakers combine marine-certified durability with high-efficiency 275W peak power output. Featuring a dynamic balance polymer/mica composite woofer and a liquid cooled silk/polymer dome tweeter, these speakers deliver clear, distortion-free sound in any environment. Designed for easy installation in vehicles and boats, the DB521 pair offers a perfect blend of ruggedness and premium audio performance.

## Description

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.

Review: DB521s and 2004 Wrangler TJ - I have been a long time fan of Polk audio and use their speakers for my home theater setup. These arrived quickly, as is generally the case with desertcart, and the product was packaged quite nicely. I had no issues with the shipment. The vehicle I installed these speakers on is a 2004 Wrangler and they were installed in front speaker boxes with the 4x6 to 5.25 adapters that are sold on desertcart ($14). They were fairly easy to install, especially after taking a few minutes to plan how I wanted to mount them. They have normal terminals for which quick disconnects can be used. I ended up buying some cheap ones from Auto Zone for like 3$ for a pack of 20. The set comes with 2 mounting spacers (needed if you have a speaker location with a smaller diameter speaker slot for example like my Wrangler), a rubber gasket to create a good seal, two speakers, 8 long screws and 8 short screws, and the grill. The only unfortunate downside to this set is that the smaller screws will not work if you need the mounting spacers. They are approximately 1/6th of an inch long and are used to secure the speakers in a normal speaker slot. Meaning they are too short to be used with the grill or with use in a spacer. Luckily I had some drywall screws that were almost identical to the 8 larger screws and I was able to mount them with no issues. I have uploaded some pictures of how they fit and of the smaller screws. I am sure they would probably work to an extent but would not want to take the risk that they would fail with only so little plastic holding them in. Great product and reasonably priced. In fact they are so reasonably priced that they are about 30$ cheaper than Crutchfield or any other comparable competitor. They offer a great range of sound and have completely changed how the audio in my vehicle sounds. The sound from the front speakers is still a little off, but I believe that I need to go with a power block for my H/U as they should sound much clearer once they have some more power going to them. The Jeep is also pretty horrible when it comes to acoustics. Overall I am completely satisfied with my Polk products and would definitely purchase the 521s and 621s again in the future.
Review: great sound worth the price - sound great seem durable.

## Features

- 5 1/4 inches 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
- Maximum input power: 135 watts
- Equipped with a dynamic balance polymer/mica composite mineral filled cone for a big sound
- Durable butyl rubber surround stands up to the stress of extreme temperatures, sunlight and time

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000P0PF8C |
| Additional Features | Water-resistant, Durable |
| Antenna Location | All |
| Audio Driver Size | 5.25 Inches |
| Audio Driver Type | Dynamic Driver |
| Audio Output Mode | Surround |
| Best Sellers Rank | #85,631 in Electronics ( See Top 100 in Electronics ) #1,009 in Car Coaxial Speakers |
| Brand | Polk Audio |
| Built-In Media | 2 x Speaker |
| Color | SILVER |
| Compatible Devices | Desktop, Gaming Console, Karaoke Machine, Laptop, MP3 Player, Projector, Smartphone, Tablet, Television |
| Compatible with Vehicle Type | Boat |
| Connectivity Protocol | Coaxial |
| Connectivity Technology | Coaxial |
| Control Method | Voice |
| Customer Package Type | Standard Packaging |
| Customer Reviews | 4.4 out of 5 stars 789 Reviews |
| Enclosure Material | Composite |
| Global Trade Identification Number | 00747192112769 |
| Impedance | 4 Ohms |
| Is Waterproof | FALSE |
| Item Dimensions D x W x H | 8"D x 14.5"W x 4.75"H |
| Item Weight | 500 Grams |
| MP3 player | No |
| Manufacturer | Polk Audio |
| Material | Composite |
| Model Name | AA1521-A |
| Model Number | AA1521-A |
| Mounting Type | drop-in" or "car mount |
| Number Of Circuits | 2 |
| Number of Audio Channels | 2.0 |
| Number of Batteries | 1 12V batteries required. |
| Number of Items | 2 |
| Power Source | Corded Electric |
| Series Number | 1521 |
| Speaker Maximum Output Power | 275 Watts |
| Speaker Size | 5.25 Inches |
| Speaker Type | Coaxial |
| Specific Uses For Product | Vehicle, Boat |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer Diameter | 5.25 Inches |
| Total Ethernet Ports | 2 |
| Tweeter Diameter | 0.75 Inches |
| UPC | 732233429210 698895342697 747192112769 |
| Unit Count | 2.0 Count |
| Warranty Description | 1 year |
| Warranty Type | Limited |
| Water Resistance Level | Water Resistant |
| Wireless Technology | Coaxial |
| Woofer Diameter | 5.25 Inches |

## Product Details

- **Audio Output Mode:** Surround
- **Brand:** Polk Audio
- **Connectivity Technology:** Coaxial
- **Mounting Type:** drop-in" or "car mount
- **Speaker Maximum Output Power:** 275 Watts

## Images

![DB521 5.25-Inch Coaxial Speakers (Pair, Silver) - Image 1](https://m.media-amazon.com/images/I/610H6nP2DqL.jpg)

## Questions & Answers

**Q: What is the shipping weight / dimensions?**
A: Approximately 1 to 1 1/12 lbs, 13"x7"x7".great sound for the size,great marine application

**Q: whats the cut out size of mounting hole**
A: It calls for 4 and 11/16" but I used a 4.5" hole saw and it fit perfect..

**Q: What is the thickness of the speaker**
A: 2 5/16"

**Q: Can this pair fit a door on a Nissan, that requires 6.5 sized speakers ?  If yes, how so ? Thanks**
A: You can try to find conversion plates since they are a smaller speaker for the 6.5 inch speaker hole for the Nissan. However, I would recommend that you just go with a pair of 6.5 speakers since they are what would fit without modification, plus the speaker size between the 6.5 to the 5.25 will be better. Better quality, Deeper midbass, etc.

## Customer Reviews

### ⭐⭐⭐⭐⭐ DB521s and 2004 Wrangler TJ
*by M***K on April 8, 2015*

I have been a long time fan of Polk audio and use their speakers for my home theater setup. These arrived quickly, as is generally the case with Amazon, and the product was packaged quite nicely. I had no issues with the shipment. The vehicle I installed these speakers on is a 2004 Wrangler and they were installed in front speaker boxes with the 4x6 to 5.25 adapters that are sold on Amazon ($14). They were fairly easy to install, especially after taking a few minutes to plan how I wanted to mount them. They have normal terminals for which quick disconnects can be used. I ended up buying some cheap ones from Auto Zone for like 3$ for a pack of 20. The set comes with 2 mounting spacers (needed if you have a speaker location with a smaller diameter speaker slot for example like my Wrangler), a rubber gasket to create a good seal, two speakers, 8 long screws and 8 short screws, and the grill. The only unfortunate downside to this set is that the smaller screws will not work if you need the mounting spacers. They are approximately 1/6th of an inch long and are used to secure the speakers in a normal speaker slot. Meaning they are too short to be used with the grill or with use in a spacer. Luckily I had some drywall screws that were almost identical to the 8 larger screws and I was able to mount them with no issues. I have uploaded some pictures of how they fit and of the smaller screws. I am sure they would probably work to an extent but would not want to take the risk that they would fail with only so little plastic holding them in. Great product and reasonably priced. In fact they are so reasonably priced that they are about 30$ cheaper than Crutchfield or any other comparable competitor. They offer a great range of sound and have completely changed how the audio in my vehicle sounds. The sound from the front speakers is still a little off, but I believe that I need to go with a power block for my H/U as they should sound much clearer once they have some more power going to them. The Jeep is also pretty horrible when it comes to acoustics. Overall I am completely satisfied with my Polk products and would definitely purchase the 521s and 621s again in the future.

### ⭐⭐⭐⭐⭐ great sound worth the price
*by M***. on February 17, 2026*

sound great seem durable.

### ⭐⭐⭐⭐⭐ Wow! Travel trailer, exterior speakers. Wow!
*by J***R on November 2, 2018*

These speakers are loud speakers, not just small area speakers. They fill the area with sound. If you Have a travel trailer or motor coach, you know that average car audio speakers don't sound great in a large space. Polk *crushed* it with these speakers! I replaced the OEM speakers on the outside of our travel trailer with these Polk speakers. Wow! The sound is crystal clear, not what you'd expect from a speaker this small with "okay" bass punch but overall, for what they are these things are amazing! You can stand 15 feet away from the trailer in front of the speakers and close your eyes and you can't pinpoint where the two speakers are, even though they're only about 36 inches apart from each other. I put a set of these in an old BMW I had years ago because I had a steel deck and I didn't want to cut the rear deck up. They sounded about as good as they could get for a five and a half inch speaker. So I figured I'd try my luck with these and wow was I ever impressed. When I called my wife out she was speechless. They were still brand new, not technically broken in to techie standards, and they already sounded amazing. Spend the extra $20 and buy the speakers. You won't be upset. We're replacing the interior speakers next weekend... With the same folks but six and a half inch... LOL love these speakers!

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-06-02*