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.

Customer Reviews Average rating - 4.5

Rating - 4 Date: 2008-10-14
Content: 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.
Summary: Great little speakers

Rating - 2 Date: 2008-10-14
Content: 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
Summary: Speaker life

Rating - 5 Date: 2008-10-06
Content: Own several Polk speakers and love them all.

Mounting bracket is sturdy and well designed to hold speaker in any position. Good job Polk!
Summary: another great speaker via Polk

Rating - 5 Date: 2008-09-29
Content: 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.
Summary: Polk Atrium 45 - OUTSTANDING outdoor speakers for a low price

Rating - 5 Date: 2008-09-22
Content: 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.
Summary: Great product for the price