KCBS-FM (93.1 MHz) is a commercial radio station in Los Angeles, California, serving Greater Los Angeles. It is owned by Audacy, Inc., and broadcasts an adult hits music format branded as "93.1 Jack FM". Unlike most radio stations airing the Jack FM formula, KCBS-FM runs a fairly focused playlist of popular classic rock and modern rock tracks. Currently, the station has no DJs. The only voices heard on Jack-FM are Crystal Z with her "Jacktivities" (events and whatever announcements deemed worthy by "Jack") and Howard Cogan supplying prerecorded quips and ironic remarks between songs. Unlike most other stations in this format, the call sign does not include any form of the word "Jack," opting instead to keep call letters tied to the station's former CBS corporate identity. Although Jack proclaims that the station is run "in a dumpy little building in Culver City", the KCBS-FM studios and offices are actually located at 5670 Wilshire Boulevard in Los Angeles, after moving from a previous location at the corner of Fairfax and Venice in 2018. The transmitter is atop Mount Wilson. KCBS-FM broadcasts using HD Radio technology. Two digital subchannels carry country music and sports betting formats. History The Young Sound and mellow rock On March 30, 1948, the station signed on as KNX-FM. In its early years, KNX-FM was mostly a simulcast of sister station KNX 1070 AM. In the mid-1960s, KNX-FM, along with other CBS-owned FM radio stations, began airing an easy listening format branded as "The Young Sound". It played mostly instrumental cover versions of popular songs, but it was a bit more uptempo than competing beautiful music stations. In 1973, KNX-FM switched to a mellow rock format, featuring artists airing on other rock stations but choosing softer selections than heard on rivals KLOS and KMET. (Volunteers launched an internet stream recreating the KNX-FM format of the 1973-1983 era in 2019, now calling itself "TheMellowSound.net, a KNX-FM 93 tribute". Another tribute website is simply "KNXfm.com" with a similar mix of mellow rock and classic features.) Hitradio 93 On August 25, 1983, KNX-FM adopted a Top 40 music format, similar to the other CBS Radio FM stations, and branded as "Hitradio 93 KKHR". The heritage KNX-FM call sign switched to KKHR. KKHR was not a traditional top 40 music format of the time, as the playlist was more stringently limited to 30 songs. The original KKHR disc jockey staff consisted