Monitor Audio introduced its flagship Platinum loudspeaker to the US at CES. The lineup includes the floor-standing PL300 ($8999/pair), the PL100 bookshelf ($4299/pair), the PL350 center ($4299), and the PLW-15 600W subwoofer ($4299). Stands are optional. The big system was not in use while I was there, but the smaller PL100's sounded clean and natural, with fine imaging, an uncolored midrange, and sparkling but not exaggerated highs from the ribbon tweeter—a first for Monitor Audio.