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Add dynamic height channels to your surround system with this pair of MartinLogan Motion AFX Dolby Atmos-Enabled Add-On Speakers. Each speaker can handle 20 to 200W of power and incorporates an upward-firing 5.25" woofer and 0.75" tweeter. The up-firing design helps to create a more immersive listening experience by beaming overhead sound effects off your ceiling to create an additional audible dimension. This speaker pair is designed to sit atop your existing flat-topped bookshelf or floorstanding speakers, such as the rest of the MartinLogan Motion product line, but alternate placement options are available if you have curved- or angle-topped speakers.