0ur opinion: :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
: Tired of leaving the door open to hear your music on the deck? lt's time for a pair of high-quality outdoor speakers like the Atrium 45 from Polk Audio. The speakers each feature all-stainless-steel and brass hardware for years of rustproof reliability and a rustproof aluminum bracket that permits multiple mounting options and full 90 degree rotation: you can aim them to deliver the best possible sound in a variety of positions.
The Atrium 45 speakers have a wide dispersion pattern, and they're very efficient, operating on as little as 10 watts per channel. They're designed to deliver good sound quality across a large listening area, but Polk recommends multiple-pair setups if you want high sound levels in an outdoor setting, as sound tends to dissipate more quickly outdoors than in.
The speakers' white finish is paintable to match your decor or trim color--you can even paint them green to blend with foliage. Their sculpted front baffle and rounded enclosures minimize diffraction (sound reflecting off of hard edges) for more open and lifelike imaging, and their rustproof aluminum grilles offer 55 percent open area for better high-frequency response than speakers with denser grilles.
Sealed-enclosure (acoustic suspension) cabinets result in taut bass, and the speakers' 2-way design incorporates a 4.5-inch long-throw polymer cone driver with butyl-rubber suspension and a .75-inch dome tweeter with a neodymium magnet to broadly distribute high frequencies. Gold-plated, 5-way binding post terminals will never corrode. The plugs also allow hookups in a range of methods, including convenient banana-plug-terminated speaker cable.
The Atrium 45 meets or exceeds ASTM D5894-UV Salt Fog, Mil standard 810 lmmersion and Mil standard 883 Method 1009 8 for salt and corrosion tests.
What's in the Box Two speakers (each with detachable metal grille and built-in mounting bracket) a user's manual, and warranty information.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Never Disappointed With Polk ...
I own many Polk speakers including models dating back to the mid 80's (10's, 5's, and 4.6 series just to name a few). These Atrium 45's are my newest addition. Because of our current budget, I seriously considered spending less and therefore looked at some of the other models in the top ten sellers list. But, I am very devoted to Polk. Why? Because they sound great. If you are debating whether or not to spend the extra cash for these (like I was), I promise you will not be sorry with the sound quality and the overall quality of this speaker system. I am very happy that I purchased these speakers. One more note worthy of mention: the bass output from these tiny speakers is very impressive.
Buyer's feedback: 
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SOUNDS GREAT
I INSTALLED TWO OF THESE SPEAKERS ON FRONT OF MY HOUSEBOAT. THEY SOUND AWESOME, AND LOOK GREAT ALSO. I PLAN TO GET ONE MORE SET FOR UPPER DECK FOR WHEN WERE ANCHORED OUT AND HAVING A PARTY.
Buyer's feedback: 
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* Reasonable price and on time. ...
These speakers are great! They were easy to install and sound great!
I would use these people again.
Buyer's feedback: 
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They met my expectations.
I purchased the Polk Atrium 45 outdoor speakers about a month ago, and for $113, I am pleased with their performance. Some of the reviews I read criticized their bass performance, and they are a bit lacking in bass, but given their size limitations,they do OK. They are bookshelf-type speakers, for crying out loud, and I don't have an outdoor subwoofer. I mounted my speakers on 4x4 posts on my deck inside (believe it or not) foam coolers that are slightly larger than the speakers. This affords me complete weatherproofing, as the lid seals the speaker in when not in use. I used washers on either side of the foam when mounting them. The bass really livened up with the white foam surrounding them. And no, it doesn't look tacky. The overall sound of this set is better than the Polk speakers they replaced, and with the addition of another set, I will be quite happy. I live in the country, and can crank them up as loud as I wish.
With outdoor speakers, most people are forced to listen to one mode unless they wish to run inside and change CDs or stations on the sattelite radio. For years I have used the X-10 Powermid and can listen to anything I wish -- this is an infrared remote control extender that looks like pyramids. I have one inside (with infrared sensors placed close to my equipment) and one outside. I use my Logitech Harmony remote outside and can access anything that I can inside, including TV sound, sattelite radio, audio DVD, over the air radio, and CD. The Harmony remote automatically changes from one mode to another and controls the volume. I have had the Powermids for years and assume they are still manufactured. There's no wiring, just plug both small (3"x4") units into AC outlets.
But back to the Polks, for the money I paid, I have no criticisms. I just ordered another pair to augment the first two.
Buyer's feedback: 
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* better than expected ...
We recieved these and got right to work installing them in our backyard. My husband and I both agreed that they were easy to install and sound better than we thought.