This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST


Multi-application all-weather speaker.

Available Finishes:
Additional Images

Small Speaker Loves to Play Outside.

Like all our other multi-application loudspeakers that were created to live and play outdoors, the Atrium45 meets or exceeds several stringent military waterproofing specifications. The loudspeaker’s unobtrusive, compact design makes it easy to tuck under eaves, but there’s nothing small about its sound.

Atrium45 Features:

All stainless steel and brass hardware for years of rustproof reliability.

Meets or exceeds ASTM D5894-UV Salt Fog, Mil standard 810 Immersion and Mil standard 883 Method 1009 8 for salt and corrosion tests.

Rustproof aluminum bracket allows multiple mounting options and full 90° rotation: aim them to deliver the best possible sound in a variety of locations.

Rustproof aluminum grille has 55% open area for superior sound quality.

Available in black or white finish.

White finish is paintable to match decor or house or trim color. Paint them green to blend with foliage!

Gold plated 5-way binding post inputs.

Sculpted front baffle and rounded enclosure minimize diffraction (sound reflecting off of hard edges) for more open and lifelike imaging.

4 1/2-inch (11.4cm) long throw polymer cone driver with butyl rubber suspension pumps out surprising bass response.

3/4-inch (19mm) dome tweeter with neodymium magnet broadly distributes high frequencies to cover a large area with high fidelity sound.

All Polk Audio products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk Audio loudspeakers are built to perform for a lifetime.

Driver Complement

Diameter3/4" (1.91cm) 
TypeSoft dome with Neodymium magnet 
Mid / Woofer
Diameter4 1/2" (11.43cm) 
TypeDynamic Balance, mineral filled polymer with rubber surround 


Total Frequency Response75Hz - 20kHz 
Nominal Impedance8 ohms
Efficiency89 dB
Recommended Amplifier Power10 - 80 watts per channel
InputsGold-plated 5-way binding posts 

Amplifier Specs

Amplifier Type


Cabinet Dimensions
Height9 1/2" (24.13cm) 
Width6 1/4" (15.88cm) 
Depth7 5/8" (19.37cm) 
Mounting Options90 degree swivel bracket supplied 
Product Weight (each)5.00 pounds


Unit of MeasurePair 
Total Shipping Weight12.00 pounds
Included AccessoriesWall mount bracket 


Speaker Warranty2 years parts and labor (original purchaser) 

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

Atrium 45 Media

Atrium 45 Literature

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Atrium45 Accessories