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Polk Audio Atrium8 SDI

All-weather indoor/outdoor speaker with selectable stereo input mode (Black)

Item #: 107ATR8SDB

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13 Reviews

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Use Polk's Atrium8 SDI speaker when you need maximum flexibility along with premium outdoor sound. It can stand alone as a single stereo speaker, or you can put two together for a high-performance stereo pair. One speaker is convenient when you want to pump tunes to a smaller area, like a deck or patio, or when mounting options are limited. If you have room for two speakers, these speakers will give you fuller sound and better stereo separation in larger listening areas. A simple switch allows you to choose between single-speaker or traditional two-speaker stereo playback.

This speaker boasts the build quality you'd expect from Polk. It gives you superb audio performance, thanks to dual 1" tweeters, one 6-1/2" woofer, and PowerPort® bass venting. And the rugged, weatherproof design meets or exceeds stringent military specifications for full exposure to the elements. That means you'll enjoy years of great tunes, whether you install them in your bathroom or in your backyard.

Polk's new Speed-Lock™ system makes mounting the Atrium8 SDIs quick and easy. Install the bracket and simply click the speaker into place. Then just aim the sound towards your listening area and tighten down the included thumbscrew.

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Shop our selection of in-wall speaker wire.

Product Highlights:

  • all-weather enclosure
  • one 6-1/2" woofer
  • two 1" aluminum dome tweeters
  • tweeter placement is designed for better stereo separation in single-speaker setups
  • PowerPort® technology for better bass response
  • frequency response 45-27,000 Hz
  • sensitivity 91 dB
  • 8-ohm impedance
  • handles up to 125 watts per channel
  • includes mounting hardware
  • 8-1/2"W x 12-7/8"H x 9-7/16"D
  • warranty: 5 years
  • Our 60-day money-back guarantee
Priced each

    Outdoor speakers let you move the party outside

    Outdoor speakers are built tough -- they laugh at wind, rain and weather. Tuck a pair under your eaves and they'll pump out the tunes to keep everybody smiling and swaying at your next cookout or pool party. We also have some "rock" speakers that blend seamlessly into your landscaped lawn or garden.

    Hands-on research

    What's in the box?

    Download owner's manual

    • Black all-weather speaker
    • Mounting bracket (installed) Owner's Manual
    • Online Product Registration card
    • Polk Audio brochure

    Product Research

    Outdoor Speaker
    Driver Technology
    Enclosure Design
    Mounting Options

    Outdoor Speaker

    Weatherproof Design: Polk Audio All-Weather Certified, Atrium Series speakers exceed baseline industrial and military specifications for environmental endurance (ASTM D5894-UV Salt Fog, Mil Standard 810 Immersion, Mil-Std 883 Method 1009.8 for salt and corrosion.) Certification means Atrium speakers can effortlessly withstand the outdoors, and hold up in extreme temperatures and precipitation.

    Driver Technology

    Polk Patented Technologies: Patented Dynamic Balance and Klippel Optimization technologies ensure the perfect material performance, eliminating driver and tweeter "artifacts" for more realistic sound reproduction at high and low volume levels.

    • Dynamic Balance: A Polk perfected method of analyzing a speaker's microscopic behavior with laser Interferometry. Polk engineers can tune out unwanted resonance and distortion with the right combination of materials, geometry and construction techniques. This brings you pure, distortion-free sound.
    • Klippel Optimization: By using a state-of-the-art Klippel Distortion Analyzer, Polk engineers were able to optimize the woofer's motor structure, voice coil alignment and suspension bringing you the best possible performance even at extreme listening levels.

    6.5" DVC Woofer: The Polk Audio Atrium8SDI uses a dual-voice coil long-throw aerated polypropylene 6.5" woofer for clean midrange and deep, accurate bass. The dual voice coil design adds greater efficiency and power handling. For a smoother response and improved durability, the woofer uses a butyl rubber surround.

    Dual Tweeters: The Polk Audio Atrium8SDI has two 1" anodized aluminum dome tweeters with rubber surrounds and neodymium magnets for better power handling, smoother response and greater accuracy. This Dual Tweeter Array features Stereo Tweeter Aiming for excellent imaging, allowing you to use the Atrium8SDI as a single stereo speaker, or as half of a stereo pair.

    Enclosure Design

    Rugged Enclosure Design: The durable, mineral-filled polypropylene cabinet design, with molded-in bracing, sounds like a real speaker (not "an outdoor speaker"), and survives years of seasonal changes, for great sound, no matter what the weather. The rugged, mineral-filled polypropylene enclosure features a rustproof aluminum grille, rustproof aluminum bracket, and stainless steel/brass hardware.

    Note: The speakers are available in a black or white finish. The enclosure is also paintable.

    Broad Coverage Baffle Design: The sculpted front, steeply-angled baffle design and rounded enclosure minimize diffraction (sound reflecting off of hard edges) for more open and lifelike imaging.


    Dual Input/Single Input Feature: A rear mounted switch allows the Atrium8SDI to operate as a single, dual-input speaker for stereo applications, or a traditional single-input speaker for left or right use. When using the Atrium8SDI as a single stereo speaker, the dual tweeters and dual voice coils handle the left and right signals independently.

    5-Way Binding Posts: The Atrium8SDI has two sets of gold-plated 5-way binding posts that will accept bare wire, pin connectors, spade connectors, and banana plugs (single or dual).

    Mounting Options

    Speed-Locking Mounting System: The included rustproof aluminum bracket allows multiple mounting options and is quick-and-easy to install. The Atrium8SDI can be mounted either horizontally or vertically and aimed to deliver the best possible sound in a variety of situations The integrated bracket provides full 180-degree rotation (when mounted vertically or horizontally. The mounting bracket even allows the speaker to be mounted snugly in a corner or under an eve (at a downward 45-degree angle). You can remove the bracket and use the speaker's built-in stability feet, if you simply want to place the speaker on a table or shelf.


    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 verify what’s in the box, 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.

    Polk Audio Atrium8 SDI Reviews

    Average Customer Review:

    13 reviews
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    Polk Atrium 8 SDI

    Written By Papa, Emerald Isle, North Carolina on Friday, March 27, 2015

    Crutchfield Customer Review (What's this?)

    Easy to install and sound great installed under a wooden 12' high deck. Located near Atlantic Ocean, exposed to salt atmosphere. Will see how they hold up over time

    Pros: construction appears substantial, easy installation

    Awesome outdoor sound!

    Written By Colt45, Midland,tx on Tuesday, March 17, 2015

    Crutchfield Customer Review (What's this?)

    I bought these to replace some worn out Boston acoustic patio speakers and they didn't disappoint! Well worth the money!

    Pros: Clear, nice low frequencies, the ability to run one speaker in stereo

    Cons: None

    Great speakers

    Written By Poolside, Arizona on Wednesday, January 07, 2015

    Crutchfield Customer Review (What's this?)

    I can't say anything but good things about these speakers! WOW - as the other reviews have stated!

    Pros: These are great sounding speakers, easy to install - with many variations to fit any situation, can use singly or in pairs - I choose a pair, a pleasure to my semi-audiophile ears. Can't wait for summer to be able to listen to them more as the temperatures warm-up!!

    Cons: Can't think of one "con" to say about these.


    Written By Matt, FL on Friday, October 24, 2014

    Crutchfield Customer Review (What's this?)

    While building my new home I wired everything up for my outdoor space fully intending on purchasing the Polk A7's. I wired up for four of them...well when it finally came time to make my purchase the A7s were not available anymore so naturally I just went up instead of down and got the A8 and Wow!!!! I have about a half acre back yard and I just bought two to get me started and they put out so much great sound well idk when I'll buy the other two don't even question it if you are thinking of these you will not be disappointed

    Pros: Amazing sound high and low! Excellent build quality! Easy to install! Aesthetically pleasing!

    Cons: None so far I love these speakers!

    Outstanding speaker

    Written By Rodboy, Hamilton, Ohio on Sunday, August 31, 2014

    Crutchfield Customer Review (What's this?)

    I have been looking for a good outdoor speaker for some time now. I have all polk speakers in my system but was concerned about their expertise in an outdoor environment. Due to brand loyalty I ordered this atrium 8 and have not been disappointed. I have never heard an outdoor speaker sound as good as this one. I have audiophile friends that have them all so I have listened to quite a few others. This speaker has unbelievable bass response. It's like having a sub outside. The mounting is very flexible. I have it wired to receive both stereo channels. I only bought one speaker to test it out before ordering another. On listening to just one I don't think I need two since it sounds so good. I could go on and on but I'll cut it short. I don't like typing a lot. My nickel's worth to someone looking for an outdoor speaker is to take a look at this one. There is no better in my opinion. But if you want to chase your tail to find something better and more expensive. be my guest. Good luck on that.

    Pros: Extremely good sound. Excellent bass. Very good mounting options.

    Cons: None

    Polk Atrium 8

    Written By n, atlanta on Saturday, May 17, 2014

    Crutchfield Customer Review (What's this?)

    Love the Atrium 8 speakers. We bought these to use for our daughters wedding. We had the wedding on our lake lot and we were worried that the sound would be lost due to the size of the outdoor area. The speakers were awesome. Such great surround that you couldn't tell where to music was coming from. I would highly recommend.

    Pros: Great sound for large out door area's.

    Cons: Non

    Polk Audio Atrium8 SDI

    Written By mike, mason city,iowa on Monday, September 09, 2013

    Crutchfield Customer Review (What's this?)

    works as expected

    Polk Audio Atrium8 SDI

    Written By Peter, Westerly, RI on Thursday, August 01, 2013

    Crutchfield Customer Review (What's this?)

    Sound great.

    Great product

    Written By Corey R, Lebanon, Tn. on Sunday, June 30, 2013

    Crutchfield Customer Review (What's this?)

    Great product. Very good sound for a single speaker setup. Sound is very balanced and clear. Provides great entertainment on our patio area with plenty of volume range. Would definitely buy again.

    Pros: Sound quality

    Cons: None

    Polk Audio Atrium8 SDI

    Written By Doug D., Madisonville, LA on Sunday, June 24, 2012

    Crutchfield Customer Review (What's this?)

    Had these speakers up for about a few weeks now and they are fantastic! Great sound on highs, lows and mid range. In my opinion, a great speaker!

    Pros: Great sound. Can hear highs, lows and mids with excellent quality.

    Cons: Non as of yet!

    Atrium 8 SDI WH

    Written By JohnG, Baltimore, MD on Friday, February 03, 2012

    Crutchfield Customer Review (What's this?)

    I have several Polk Audio speakers (7.1 home theatre in-wall with powered 10 inch subs and a couple of auxiliary LC80FX in ceiling speakers). I've never gone wrong with Polk and so far this speaker is no exception. The audio quality is excellent. I think the biggest factor in my overall satisfaction will be whether or not it holds up well to the elements, though, and it's too early to say.

    Pros: Great sound. Versatile (can be used as a single unit with two sets of drivers receiving signals from two sides of a stereo output, or as one of a set of multiple speakers in a conventional setup). Substantial mounting hardware that is user friendly.

    Cons: Fairly heavy. Fairly expensive.

    WOW- Super Powerful

    Written By Eric, cicero, ny on Saturday, June 25, 2011

    Crutchfield Customer Review (What's this?)

    purchased this for my backyard where my patio and pool is. This speaker is extremely powerful. Sounds clear, looks great, so glad I purchased this item. I put it under my eaves and added the niles weatherproof volume control from crutchfield. The volume control is a must have with this product. Awesome.

    want outdoor speakers? get these

    Written By jerry r f, staten island on Wednesday, May 18, 2011

    Crutchfield Customer Review (What's this?)

    installation couldn't be easier if you layed them on the floor, best sound I've
    heard in outdoor speakers, bar none.Larger than others but mounting flexibility
    others don't have.

    Product reviews from the Crutchfield Labs

    What are the Labs?

    Get everything you’ll need to enjoy your new Polk Audio Atrium8 SDI

    UL-listed speaker wire is designed to be run through walls and is building code compliant.
    Set the volume level in your remote location without going back and forth from indoors to outdoors.
    Add power protection to your outdoor speakers and volume controls.
    AudioQuest FLX-14/2 14-Gauge 2-Conductor In-Wall Speaker Cable

    AudioQuest FLX-14/2 14-Gauge 2-Conductor In-Wall Speaker Cable

    UL-approved for in-wall use; direct-burial rated (125 feet)

    Item #: 703142125


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    AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable

    AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable

    UL-approved for in-wall use; direct-burial rated (125 feet)

    Item #: 703144125


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    AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable

    AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable

    UL-approved for in-wall use; direct-burial rated (125 feet)

    Item #: 703162125


    Add to Cart
    AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

    AudioQuest FLX-16/4 16-Gauge 4-Conductor In-Wall Speaker Cable

    UL-approved for in-wall use; direct-burial rated (125 feet)

    Item #: 703164125


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    Russound WALTX-2

    Russound WALTX-2

    Weatherproof stereo volume control with impedance magnification

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    Niles WVC100E

    Niles WVC100E

    Weatherproof stereo volume control with impedance magnification

    Item #: 190WVC100E


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    Panamax MOD-SPKP

    Panamax MOD-SPKP

    Add-on protection module for outdoor speakers and control lines

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