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Polk Audio

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

  • Based on 9,702 reviews
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Availability: In Stock.
Fulfilled by Adorama
Arrives Jul 24 – Jul 25
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Color: Black


Style: Atrium 4 (Pair)


Features

  • EASY INSTALLATION - One-click speed-lock mounting bracket offers anti-slip, one-handed installation. Mount these speakers vertically or horizontally to deliver optimal sound in different setups
  • EASY SETUP - Polks gold plated 5-way biding post can easily connect to any modern AVR or amplifier
  • ALL WEATHER CERTIFICATION - The speaker for all seasons. With rugged durability and premium build, these speakers can effortlessly withstand all elements including extreme temperatures and heavy rain
  • EXCEPTIONALLY GREAT SOUND - High fidelity sound for small-to-medium outdoor areas. Atrium 4 can be installed in any open space by a pool, on the patio, in the sunroom, or fit anywhere in the backyard
  • ULTRA COMPACT - Compact outdoor loudspeaker with a 4.5 dynamic balance polypropylene woofer, 34 anodized aluminum dome tweeter

Description

The compact Atrium 4 loudspeaker produces high fidelity sound quality anywhere you want great sound. Its small size makes it ideal for tight, out-of-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 cabinet features a rustproof aluminum grille, rustproof aluminum bracket, and stainless steel/brass hardware that can endure seasonal change and provide great indoor speaker-quality sound 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


Model Name: Atrium 4


Speaker Type: Outdoor


Special Feature: Bass Boost, Waterproof


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


Compatible Devices: Laptop, Desktop, Television


Subwoofer Diameter: 4.25 Inches


Unit Count: 2.0 Count


Controller Type: Corded Electric


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


Vehicle Service Type: Car


Water Resistance Level: Waterproof


Customer Package Type: Frustration-Free Packaging


Audio Driver Type: Dynamic Driver


Connectivity Protocol: RCA, XLR, Coaxial, HDMI, USB


Includes MP3 player?: No


Number Of Circuits: 1


Series Number:


UPC: 747192118792


Style: Atrium 4 (Pair)


Global Trade Identification Number: 92


Manufacturer: DEI Holdings


Item Weight: 3.6 pounds


Country of Origin: China


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: Jul 24 – Jul 25

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

    • The Outdoor Standard
Color: Black Style: Atrium 5 (Pair)
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
    • A very good speaker!
Color: White Style: Atrium 5 (Pair)
I go through outdoor speakers every few years. The last set (Monoprice) lasted 5-6 years(?), but I suspect the woofer surrounds rotted out a couple of years ago; they were 50% completely missing! They never sounded very good either. The all-good reviews on the Polk Atrium 5 looked like they could be worth the higher cost than I usually pay. So I snapped up a "Used - Mint Condition" pair that actually looked unopened. Bingo! The bass is very good for a 5" woofer, with reasonably extended lows. Very clear sound overall. Time will tell if they can handle our hot dry So. California sun better than the rest. ... show more
Reviewed in the United States on July 9, 2025 by Zeek the Geek
    • Great Quality HiFi Outdoor Speakers
Color: White Style: Atrium 5 (Pair)
I installed these on my pool lanai to replace some old speakers I had. I am blown away by them. From my pool I have perfect stereo imaging. What that means, is that not only does it sound great, but it does not have to be loud to hear all the details of the music. My neighbors definitely apricate that. I'm a HiFi geek and these absolutely satisfy my audiophile needs. I had thought about going with the larger version but these are perfect for my needs. These are powered by the Zone Two of my Onkyo RZ50 (I highly recommend as well) which is 120w per channel. That power definitely helps, but I'm sure these will sound great off of any decent amp. If you are looking for a good quality outdoor speaker I guarantee you will be more then happy with these. ... show more
Reviewed in the United States on June 16, 2025 by Casey Moore
    • 2 years+ use and still awesome
Color: Black Style: Atrium 8 (Each)
Review Image by Gazerdude Gazerdude
I've had them 2 years now. Outside, fully exposed mounted on posts, no roof. They still sound as awesome as they did the first day. The speaker wires I used needed replaced, as they were not rated for outdoors, after a year and a half. But these speakers are awesome. Had the first set for a business and then got a set for myself. ... show more
Reviewed in the United States on July 7, 2025 by Gazerdude Gazerdude
    • 4 years of quality service. No more
Color: White Style: Atrium 4 (Pair)
Ran well for 4 years and began faltering, I guess expect 4 years of quality sound. I had them under the roof overhang, they would not get wet.
Reviewed in the United States on July 6, 2025 by Jeffrey Timor
    • Perfect
Color: White Style: Atrium 4 (Pair)
He was so furious that I bought these for Father’s Day for him because he didn’t pick them out. His friend who is an audio file suggested them. Turned out great. Now he’s very very happy. They could get really loud.
Reviewed in the United States on July 15, 2025 by Captains2012
    • Great sound. Easy to install. March colors perfectly.
Color: White Style: Atrium 6 (Pair)
Review Image by Eric B. Eric B.
So glad I purchased these. Sound great in my backyard. Easy to install. White isn’t super bright so it blends in nicely. Far superior than the previous black speakers (not sure of brand) we had in terms of sound quality and aesthetic. Recommend the Atrium 6 vs Atrium 5 since these have bass ports for richer sound. ... show more
Reviewed in the United States on June 19, 2025 by Eric B. Eric B.
    • Just buy these
Color: White Style: Atrium 8 (Each)
Just spring for the $400 for a pair.. These sound amazing and fill my whole backyard with quality audio. They sound so much better than the Bose that they replaced. Crisp highs and surprisingly low lows. They are a little larger but I mounted them on the ceiling and they just blend in well. Pointed down at 45° they fill the area and don't sound like they're above. Time will tell about durability, but sound quality is very good out of the box...and that's from a very picky audiophile. Pushing these with a nice Sony 600w receiver...which is overkill...but there's no substitute for power and they handle half volume with no distortion with a rich full sound. ... show more
Reviewed in the United States on May 21, 2025 by Amazon Customer

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