Our review:Item Description:frequency response 75-20,000 Hz (-3dB) * sensitivity 89 dB * 8-ohm impedance * handles up to 80 watts * gold-plated 5-way binding posts * all hardware is rust-proof brass or stainless steel * speaker grille and mounting brackets are rust-proof aluminum * mounting brackets included * 9-1/2'H x 6-1/4'W x 7-3/4'D (with bracket) * warranty: 2 years
Amazon.com Item Description: Want to take great Polk Audio speaker sound outdoors? Check out the indoor/outdoor 80-watt Atrium 45s. The stainless steel and brass hardware is completely rustproof, as are the aluminum brackets that allow multiple mounting options and full 90-degree rotation: aim them to deliver the best possible sound in a variety of locations. The rustproof aluminum grilles have 55 percent open area for superior sound quality. Most importantly, the Atrium 45s rugged, weatherproof, design meets or exceeds several military specifications for water, wind, salt, and corrosion.
Inside the completely sealed enclosure is a 4.5-inch Dynamic Balance mineral-filled polymer driver with butyl rubber suspension for pumping out amazing bass, while its .75-inch soft dome tweeter with neodymium magnet broadly distributes high frequencies to cover a large area with high fidelity sound. Polk's Dynamic Balance technology produces flat frequency response, sharp detail, transparency and an ability to play program material with wide dynamic range at life-like volume levels without a hint of strain. The sound is always clean, clear, and effortless. The sculpted front baffle and rounded enclosure minimizes diffraction (sound reflecting off of hard edges) for more open and lifelike imaging.
Connect them to an amplifier or receiver using the set's gold-plated five-way speaker-level binding posts. The Atrium 45s are also voice-matched to Polk's RTi speakers, and therefore make great surrounds in a complete Polk home theater system with the ability to handle up to 80 watts per channel.
What's in the Box Pair, Atrium 45 speakers (black), mounting brackets, manual, 2-year parts and labor warranty.
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Buyer Testimonials
Average Buyer's Review:
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Great little speakers
These are great little speakers. They appear very well made and were easy to install. Sound quality is excellent although as noted by some other reviewers they might be a little bright for certain tastes. I did not want thumping bass outside, just good clear vocals. These speakers certainly deliver.
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Speaker life
these speakers have a great sound, but my experience is they don't last in the weather, I had to replace both speakers over a period of 2 years
Buyer's review: 
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another great speaker via Polk
Own several Polk speakers and love them all.
Mounting bracket is sturdy and well designed to hold speaker in any position. Good job Polk!
Buyer's review: -
Polk Atrium 45 - OUTSTANDING outdoor speakers for a low price
I purchased these speakers to mount outdoors, under my permanently camped 31' travel trailer. I am very pleased with the sound quality and am surprised at how good the bass response is. Don't get me wrong, you won't mistake these speakers for a 15" subwoofer, but they sound very full and solid for small speakers with 4.5" woofers that I paid only ~$120 a pair for.
I am driving them with an Aiwa CDC-X504MP car stereo that puts out ~20 watts/channel into 4 ohms. Since the Atriums are 8 ohm speakers, I get less than 20 watts/channel. If I were buying an amp, I'd buy one with more power, but I had the Aiwa lying around. My setup easily fills my 30'x20' camper lot with quality sound, however, this setup will not provide ear splitting sound levels.
I was very impressed with the weight of each speaker; I was also impressed with the build quality of the enclosure and the gold plated 5-way connectors.
Overall - The Polk Atrium 45s are an outstanding value. I would highly recommend them.
Buyer's review: -
Great product for the price
These speakers sound great for the price. I've only had them for a little over a month so i have no idea how long they will hold up or if they will make it through the winter.