Just for reference.
I never install audio from radeon drivers.
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The driver installs his own audio device für display port or hdmi. This may change audio autput to this device and away from the old setting. Just try to open audio options from the panel and switch the standard audio device back to your soundcard, speakers or whatever you want to use.
As it turns out, your recommendation worked. It actually fixed the problem right away, but I forgot to make it back to this post to mark your answer as correct. Thanks again.