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Polk Audio

Polk Audio Atrium 4 Weatherproof Outdoor Speakers with Powerful Bass (Pair, Black), All-Weather Durability, Broad Sound Coverage, Speed-Lock Mounting System

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Availability: In Stock.
Fulfilled by Amazon
Arrives Sep 10 – Sep 11
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Color: Black


Size: small


Style: Atrium 4


Features

  • EASY INSTALLATION - One-click speed-lock mounting bracket offers anti-slip, one-handed installation. Mount these outdoor speakers wired vertically or horizontally to deliver optimal sound in different setups
  • EASY SETUP - Polk outdoor speakers gold plated 5-way binding post can easily connect to any modern AVR or amplifier
  • ALL WEATHER CERTIFICATION - Rugged durability and premium build make these Outdoor Movie Speakers ready for every season, effortlessly withstanding extreme temperatures, heavy rain, and all elements
  • EXCEPTIONALLY GREAT SOUND - High fidelity sound for small-to-medium outdoor areas. These Atrium Polk Audio Outdoor Speakers can be installed anywhere open by pool, on a patio, inside sunroom, or across the backyard
  • ULTRA COMPACT - Compact outdoor loudspeaker for Wall Mount Speakers with a 4.5 dynamic balance polypropylene woofer, 34 anodized aluminum dome tweeter

Description

The compact Atrium 4 outdoor outdoor wired speakers produce high-fidelity sound quality anywhere you want great sound. The small size of the powered speakers makes it ideal for tight, out-of-the-way installations. With an aluminum dome tweeter and polypropylene cone driver in each speaker, enjoy deep, accurate bass and smoother response. Polk’s patented Dynamic Balance and Klippel Optimization technologies ensure perfect material performance, eliminating driver and tweeter “artifacts” for more realistic sound reproduction at high and low volume levels. The weatherproof outside speakers feature a rustproof aluminum grille, rustproof aluminum bracket, and stainless steel/brass hardware that can endure seasonal change and deliver indoor speaker-quality audio for years of outdoor listening enjoyment. Quick and easy to install with Polk’s Speed Lock Mounting system.

Brand: Polk Audio


Speaker Maximum Output Power: 80 Watts


Frequency Response: 25 KHz


Connectivity Technology: Ethernet


Audio Output Mode: Surround


Mounting Type: Wall Mount


Material: Plastic Metal


Model Name: Atrium 4


Speaker Type: Outdoor


Special Feature: Bass Boost, Waterproof


Recommended Uses For Product: For Indoor Use, For Outdoor Use, For Surround Sound Systems


Compatible Devices: Desktop, Laptop, Television


Subwoofer Diameter: 4.25 Inches


Unit Count: 2.0 Count


Surround Sound Channel Configuration: 2.0


Color: Black


Included Components: 2 Black all-weather speakers, 2 Mounting brackets (installed), Owner's Manual, Online Product Registration card, Polk Audio brochure


Product Dimensions: 6.69"D x 5.69"W x 8.63"H


Item Weight: 3.6 Pounds


Impedance: 8 Ohm


Is Waterproof: TRUE


Warranty Type: Limited


Number of Items: 2


Control Method: Voice


Speaker Size: 4.5 Inches


Power Source: Corded Electric


Woofer Diameter: 4.5 Inches


Tweeter Diameter: 19.1 Millimeters


Vehicle Service Type: Car


Water Resistance Level: Waterproof


Customer Package Type: Frustration-Free Packaging


Audio Driver Type: Dynamic Driver


Audio Driver Size: 11.43 Centimeters


Subwoofer Connectivity Technology: Wired


Includes MP3 player?: No


Number Of Circuits: 1


Series Number:


Specific Uses For Product: Outdoor Use


UPC: 747192118792


Style: Atrium 4


Indoor/Outdoor Usage: Outdoor


Global Trade Identification Number: 92


Manufacturer: DEI Holdings


Item Weight: 3.6 pounds


Item model number: AM4085-A|4


Is Discontinued By Manufacturer: No


Date First Available: February 1, 2010


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 10 – Sep 11

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Polk Audio Never Disappoints – Amazing Outdoor Speakers! 🔊☀️
Color: White Style: Atrium 8
Review Image by F. Sealey F. Sealey
I bought a **pair of Polk Audio Atrium 8 SDI speakers** for my **back patio expansion**, and they have been **nothing short of incredible**! The **beautiful design** blends seamlessly with my outdoor space, and they are built to withstand the elements. I paired these with a **SunFire amp**, and the **sound quality is simply awesome**—rich, clear, and powerful, even in an open outdoor environment. Mounting was **easy**, and the build quality feels **top-notch**, exactly what I expect from Polk Audio. I’ve been a **Polk Audio fan for almost 40 years**, and their **reputation for quality and durability** is well-earned. I still have an **older set in my garage that’s over 20 years old**, and they still sound fantastic—**which is exactly why I chose Polk again**! If you're looking for **high-quality outdoor speakers** that will last, these are a no-brainer. **Highly recommend!** 🎶🔥 ... show more
Reviewed in the United States on April 4, 2025 by F. Sealey F. Sealey
    • Very good outdoor speakers. Should easily satisfy most when paired with good amplification.
Color: Black Style: Atrium 6
The media could not be loaded. Very good speakers for the price. My application of these speakers was in my garage where I paired them with a Fosi V3 amplifier. Great clear sound and respectable base. They can play loud without distorting. They appear to be well made and are easy to setup. Very good overall performance with a good return for your dollar. Recommended. 2-8-25 Still think I made a good decision to buy this speaker. I do recommend that you buy the 48 volt power supply If you buy the Fosi V3 amp. It will give you the best performance in terms of power, loudness, clarity. I paired these great speakers with the Fosi V3 amplifier. A good inexpensive way to outfit your outdoor sound system. ... show more
Reviewed in the United States on February 3, 2025 by JH
    • Well worth the $$$$$$$
Color: White Style: Atrium 8
I previously had the Polk Patio 200’s which are a twin to the Atrium 5’s. Thought they kicked s for outdoor music and still do. Then I stepped up to the Atrium 8’s and wow just another audio dimension added. Power, spaciousness, and sound went up, up, up. Excellent speakers for backyards, patios, or anywhere outside because they can handle any type of weather thrown at them. Place them near the corners and bass is solid. So happy I upped my backyard tune source. ... show more
Reviewed in the United States on August 21, 2025 by Stereonut
    • The Outdoor Standard
Color: Black Style: Atrium 5
Excellent! I have a pair of Atrium 4’s that have performed admirably for over ten years! Those were purchased and deployed pool-side at our former home. Like them so much that I took them with me to our new place. Upon moving our pool/patio area size increased substantially. The 4’s were still part of my overall plan but I wanted to increase coverage and my speaker count to four and thought a next size speaker up with a bit more bass might be in order. Over time, I ordered/tried two other, popular and well rated outdoor speakers to fit the desired need and for various reasons returned both. Quite frankly, neither sounded any better than my old 4’s. Both cost more. I then ordered some Prime Days, “used-like new” 5’s for a fantastic price ($148) and am delighted that I did😁 Third time/try was indeed the charm! Not only do they fill the space with quality/balanced tone, I now know that my outdoor sound 🎶 needs are more than satisfied for many dependable years to come! There’s a reason that this Atrium series from Polk has been the outdoor standard setter for over a decade, I should have never wandered/doubted. Lesson learned. ... show more
Reviewed in the United States on July 18, 2025 by Rob
    • Decent Sound for the $$$
Color: White Style: Atrium 6
Review Image by S. Powell S. Powell
I got these as well as a pair of Atrium 5s to compare. I set both pair up with my indoor McIntosh Pre and Amp and auditioned them for a few hours. The bass on the 5s had a sort of artificial sound lacking definition. The 6s sounded really solid and reasonably flat with the Tone controls bypassed on the pre-amp. I liked the compact size of the 5s and they would have been easier to mount under the eaves on my deck to replace some worn out Mirage speakers I had that sounded great. But I was worried about the bass. The 6s are much heavier and larger and more expensive. But I think they are worth it. Once I got them installed and played a set of tunes I use for setting up speakers (Fagen / The Night Fly, etc), the reinforced bass, with them now much closer to the wall than they were inside, was a lot. Now connected to a nice Marantz Pre and Amp, I may need to cut the bass and treble 2-3db to get a flatter response. The A6 can cover a large area and deliver plenty of bass. I don't like over the top bass and prefer a flatter audiophile EQ, and these do that easily. I think the A5s may have worked, but the character of the bass sounded odd, so I never mounted them outside to try. Even reinforced by the wall, I don't think I would have liked them as much. Beyond that, they were fairly easy to mount - the brackets have notched detents, so they don't spin freely, which is nice - my old Mirages used to sag after a while. Overall, the sound seems mid-range weak, bright, and a little bassy. My old Mirage speakers sounded better, but they are no longer made. That said, I think I can dial them in pretty well with the treble and bass controls on the pre-amp. ... show more
Reviewed in the United States on October 7, 2024 by S. Powell S. Powell

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