B&W’s iconic Tweeter on Top—more precisely described as a free-mounted, decoupled, double-dome aluminum tweeter—has been redesigned for the CM Series loudspeakers. The CM6 S2 is the only stand-mounted loudspeaker in the CM Series to employ the Tweeter on Top design, which is generally only found on its bigger—and more expensive—floorstanding siblings. So what’s the purpose of a tweeter housed in its own enclosure mounted atop the speaker? According to B&W, such a configuration isolates the tweeter from enclosure resonances, minimizes the diffraction of high frequencies by the enclosure, improves time-alignment with the midrange driver (and thereby reduces acoustic lobing), and allows fine-tuning of the tweeter itself.