Polk Audio Atrium8 SDI

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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Product highlights:
Featured in our article: Best outdoor speakers for 2025
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
impedance: 8-ohm stereo (dual-input) or 4-ohm mono (single-input)
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
60-day returns