I don't have a dog in this fight, but reading this six-month-old thread got me to throw on my own phones (a pair of bluetooth JBL's with respectable frequency response and sensitivity) and pull up WDRC's website. When I started the stream, the 60 hz buzz was unmissable to anyone who hasn't spent their working life testing jet engines.
I then pulled up KSFO's (San Francisco, the market where I live) website and stream, and that sounds crystal clear, no discernable hum. Then KABC out of L.A., same thing. Keep in mind, that's Cumulus in both cases, not exactly the poster boy for excellence in crudblasting.
Then I went back to 'DRC and the hum was back.
So whatever else is fair game to criticize wadio about, an audio problem that has existed on the stream of a legacy commercial Hartford station for half a year shouldn't be one of them. IMO it is absolutely fair game to criticize ownership/management/engineering/I.T. for not doing de minimus of quality control on their digital distribution platform for (if wadio's timeline is accurate) at least six freakin' months...
Also, I see the point that it's not his (or yours or my) responsibility to report a problem that would have been noticed on air in fairly short order. That responsibility squarely belongs to station and/or ownership group staff. But I would also say, to anyone who has added their thoughts in this thread, why haven't you?
I don't care all that much either, but this has gone on for too long and I'm going to see if a DM gets any response. I'll let you know...