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.
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,
- 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.
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. For a stereo
configuration, 4-conductor wiring is required, and one Atrium8SDI is equivalent
to a pair of 8-ohm speakers. For traditional single-input use, only 2-conductor
wiring is needed and the speaker impedance is 4-ohms.
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).
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.