"In a word: No. It's not even close."
cleeds-
"good sound" of course is subjective, but I can't imagine anything beyond lofi, if one doesn't have a decent soundcard in their pc?
A reasonably fast, clean internet connection is commonplace now, but a standard pc typically has a mini jack audio out, so clearly one needs to invest in additional hardware?
I have limited knowledge on this subject of "online broadcast" and it's potential plugging it into a stereo rig.
If you are fortunate to live in an area with signals, seems a tuner is still a good thing for passive listening. Our public stations aren't the greatest to everyone,
but I certainly enjoy them. The commercial rock stations-well, garbage for the most part, but a few bright spots if you look for them-anyone listen to Steve Jones(former Sex Pistol) 2 hour program? Fantastic, almost a throwback to a 70's listening experience. Once in awhile, a really cool musician from the 60s/70's chatting with Steve, sharing insight about the "scene" I missed being born a decade or so too late.