Polk Audio Atrium 6 Speakers (Pair， White)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Atrium Series Speakers exceed baseline industrial and military specifications for environmental endurance. </span></li><li><span class="a-list-item"> (ASTM D5894-UV Salt Fog， Mil Standard 810 Immersion， Mil-Std 883 Method 1009.8 for salt and corrosion.) </span></li><li><span class="a-list-item"> Anodized Aluminum Tweeter Domes with Rubber Surrounds are absolutely immune to the elements. </span></li><li><span class="a-list-item"> Provide the smooth， broad high-end range you need for larger outdoor spaces </span></li><li><span class="a-list-item"> Newly designed tweeter phase cap smoothes the frequency response from 12KHz up to 20kHz， the last audible octave. </span></li><li><span class="a-list-item"> Broad Coverage Baffle Design adapted and applied from our current Atrium design. </span></li><li><span class="a-list-item"> Speed-Lock Mounting System for easy， safe one-handed installations even in difficult locations. </span></li><li><span class="a-list-item"> The greatly simplified mounting procedure means fewer parts to juggle. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41-4%2BNxfy4L.jpg" noproxy>