Enhance Speech crashes on some Macs with Intel chips / AMD GPUs

if you're NOT having problems with mixed sampling rates, go ahead continue working that way...  And some people do need an audio input selected to be able to record voice overs...    But if you ARE having problems, these are basic troubleshooting steps...  Simple things to try.     

I'd love to hear from an Adobe Employee so we can get some advice beyond "basic troubleshooting."

If not mixing sampling rates is a basic troubleshooting step then best practice would be to never mix 44KHz and 48KHz in a timeline, and Adobe Stock should absolutely not accept music beds at 44KHz sampling to be mixed in with 48KHz on timelines which is how that commonly happens with my editing workflows.

If setting audio hardware input to "none" is a basic troubleshooting step for audio issues not even involving recording audio into Premiere, then it stands to reason that Premiere should default to audio input being "none" because there's no simpler configuration than running with the default settings. 

It's never easy to diagnose these issues remotely.   I was just suggesting to start with the simplest configuration to see if that solved the problem.  Working with uncompressed audio with a sampling rate that matches the sequence settings will make the least demands on the system...

Lots of basic troubleshooting steps I'd be happy to suggest...    No idea if they will solve the problem...  but they might.  

one thing that often helps audio issues is to set  audio hardware settings input to "none."  

If this setting being set to "none" often helps audio issues, then it sounds like Premiere is setting a default that causes audio issues.

Perhaps that should be changed to default to "none" to eliminate all these issues it is causing.

However, it has made no difference to me whether it is set to its installed default or "none" in regards to Enhance Speech causing a complete system freeze on an Intel-based Mac.

There were no use of compressed audio files any of the times I have used the Enhance Speech function which caused the entire system to go down, so it seems like this assumption doesn't seem like a solution,

How much load on Premiere does  4KHz sampling rate differences add specifically?

one thing that often helps audio issues is to set  audio hardware settings input to "none."  

Still have the same issue with .wav and aiff. 

Although theoretically Premiere should be able to handle mixed sampling rates, however, it does add to the demands on the system and if you're audio files are compressed, that will also add to the demands.  First thing I'd try is to do a test with uncompressed audio .wav or aiff with the sampling rate matching the sequence sampling rate and see if enhanced speech works...  

Same issue with Premiere 24 and 25.