On January 8, 1986, under owner Fred Sands, KNAC became the first commercial heavy‑metal station in the U.S., launching its iconic “Pure Rock 105.5 KNAC” identity.

It built a cult reputation by airing all forms of metal—glam, speed, thrash, progressive, death, and more—and championing bands like Metallica, Guns N’ Roses, Megadeth, Pantera, Soundgarden, and Alice in Chains—often before they hit mainstream radio.

KNAC’s 1,500–2,100 watt signal was relatively weak, which ironically boosted its underground credibility and cult fandom.

The station famously promoted events like Monsters of Rock at the L.A. Coliseum in 1988, reinforcing its deep ties with the metal community.