RADIO ROULETTE: It’s no surprise that Power...

RADIO ROULETTE: It’s no surprise that Power 106 (KPWR-FM) continues to dominate L.A. radio, continuing its reign as the city’s highest-rated station in the new fall Arbitron Ratings Service results. But the real news was the ratings leap made by heavy-metal outlet KNAC-FM, whose “Pure Rock” format jumped from 1.0 to 1.6, giving the station its highest ratings ever and earning KNAC its first appearance in L.A.’s Top 20. “We’re thrilled,” said program director Tom Marshall. “This definitely gives us an extra boost of credibility. I think people are finally beginning to see what a wide audience hard-rock bands attract. They sell lots of concert tickets and albums, so it’s seems natural that we’re attracting a bigger listening audience out there too.” . . . The ratings news was not so good for album-rocker KLOS-FM, which dropped from a 4.3 to a 3.6 and new-rock outlet KROQ-FM, which dipped to a 3.2, its worst ratings in several years. . . . KMPC-FM, a spirited supporter of new music and perhaps our favorite rock station of all, is still struggling to escape the ratings cellar, moving from a 0.4 to a 0.7. An encouraging sign, but hardly worthy of the hysterical hoopla (“you the listeners have finally vindicated us!”) we’ve been hearing from deejay/cheerleader Jim Ladd over the past week.