Overhaul your sound system with this MartinLogan Motion SLM XL speaker. Two 4-inch high-excursion fiber cone woofers and four passive bass radiators help you feel the beat with powerful but detailed bass. This MartinLogan Motion SLM XL speaker has a Folded Motion tweeter that delivers accurate high and mid-range tones. | Martinlogan | | Motion Dual 4" Passive 2-Way Bookshelf Speaker (Each | Black | Best Buy