Elac Concentro M.2Concentro 2. 0 M. 2 Floorstanding Speaker The Concentro M displays characteristic Concentro design cues but creates its own unique sonic and visual impact. Despite its slightly more compact dimensions, every aspect of its performance is on a grand scale. The Concentro Series is a true benchmark loudspeaker designed to commemorate 90 years of ELAC history and in response to calls for a loudspeaker that rivalsand surpassesthe most ambitious designs in