Funny you should bring this up. I happen to think that the audio quality of the CC FM's in LA is terrible. KBIG sounds shrill and distorted to me and my Gawd what happened to KOST's audio? It may be louder now, but the distortion is a travesty. Listened to their midday snooze-fest the other day and thought that they were doing a remote. Not only was the audio distorted as is usual now, but when Carrie, or Keri or Kari Steel opened her mic it sounded like a beat-up SM58 at a supermarket remote. Only when I heard her put her boss from New Zealand on did I realize she was in studio. And that was a bizarre set too. She came out laughing asking if she should open her bosses mic. I thought that the next voice would be the PD, but instead it was Hurricane Andrew saying 2 or 3 words in that incomprehensible accent. KOST just sounds awful, and since HA took over engineering, I can only guess that the crappy sounding air-chains are his doing.
A/B between a CBS FM, or just about any other FM in town and a CC FM and you'll hear a huge difference in range and quality.