Polk Audio TL350 Home Theater Audio System， 85HZ - 31kHz Frequency Response<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>The ring radiator tweeter produces incredible accuracy and detail</li><li>Time Lens technology aligns the acoustic centers of the tweeter and mid-bass driver on the same spatial plane</li><li>The unique curved enclosure design employs non-parallel surfaces to strengthen the acoustically inert enclosure</li><li>Blackstone TL Series drivers can move farther， more smoothly， in a smaller space</li><li>PowerPort bass venting designed for smoothly transitioning the air flow from the port into your listening area</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31pP6CHhPPL.jpg" noproxy>