Polk Audio Atrium 4 Outdoor Speakers with Powerful Bass (Black) | All-Weather Durability | Broad Sound Coverage | Speed-Lock Mounting System (Single Pair)

First introduced in 2002, the outdoor Atrium Series set a new standard not only for build quality, but sonic performance, too. But we couldn’t leave well enough alone. Not only does our new, refined Atrium Series offer better sonic performance and easier install/mounting options, the series also exceeds the standard military specification weather tests, setting a new standard for rugged outdoor durability under our own more rigorous weatherproofing certification program. The results are a pure joy to listen to. So that wherever you put your Atrium speakers—by a pool, on a deck or in a sunroom, you can be confident they’ll deliver great sound year round . Features recommended amplifier power Per Channel - 10 watts to 80 watts with nominal Impedance of 8 ohms and total frequency response - 75 Hertz to 25 Hertz and sensitivity (1 watt @ 1 meter) - 89 decibel