Polk Audio's acquisition by Directed Electronics is the latest in a series of shifts among the audio industry's rich assortment of stars. Directed—a power in mobile tech products, judging from its website—had already acquired Definitive Technology. In another noteworthy deal, Klipsch bought API, the Canadian giant whose brand names include Mirage, Energy, Athena, and Spherex. Klipsch is also the proud new owner of Jamo, the cool Danish brand. And all this comes on top of last year's sale of Boston Acoustics to D&M Holdings—a stable that already included Denon, Marantz, McIntosh, Snell, Escient, and RePlayTV—and NHT's move from the Rockford Corp. to the Vinci Group. Why are so many potent and prestigious brands changing hands? It feels as though some invisible hand were rearranging the constellations, and declining audio-component sales are the obvious suspect. But historically, major speaker brands (with the notable exception of Bose) have been sold and resold regularly, and all the brand names involved here are valuable ones that deserve fresh and vigorous marketing.