I had to look that up myself a year or two ago when I first saw that on the tables. It is TV audio of the radio signal.
Details from the Classical Arizona PBS website (
Classical Arizona PBS):
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KBACH simulcast
In addition to our four television channels, Arizona PBS also airs a simulcast of KBACH on digital TV channel 8.5.
Known as Classical Arizona PBS, our simulcast airs 24/7 in Dolby Digital Surround. We take special care in presenting stereo programming from KBACH in surround sound while maintaining the integrity of the music.
Additionally, select Arizona PBS audio productions are presented in full-discrete surround sound. Arizona PBS’ audio production team, Central Sound, produces programs such as Arizona Encore as part of our partnership with KBACH.
Classical Arizona PBS is primarily available for those with an antenna, as it is not carried by most cable/satellite subscription services.
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There's no mention of this option on the "Listening Help" page on the station's own "KBACH" website:
Listening OptionsIf you are having problems listening, please visit our help page or contact us via our online streaming issues form.On the Radio...Listen to us on 89.5 FM in the Phoenix metro area or 89.7 FM in Fountain Hills.
kbaq.org