Which would you choose? Would the frequency difference matter that much to you? Would your choice differ depending on whether you're using them for front speakers or surround? Aperion Intimus 532-LR Bookshelf Speaker http://www.aperionaudio.com/product/Intimus-532-LR-Bookshelf-Speaker,5,0,5.aspx Aperion Intimus 632-LR Bookshelf Speaker http://www.aperionaudio.com/product/Intimus-632-LR-Bookshelf-Speaker,17,0,31.aspx