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Hmm, this got me interested. Found a tool which I can use to test myself what kind of difference do I hear: https://www.audiocheck.net/blindtests_timing_2w.php?time=5

With some training I could achieve >95% confidence in discernig 5ms with my headphones.

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In just a few minutes I was able to start identifying the difference between synced audio and a 5 ms delay. That's about my limit. I wasn't able to get the 2ms delay correct more than you would expect from guessing.

I managed to get "76/100 (76%) — Confidence : 99.99%" for the 1ms test. I wonder if headphone quality makes a difference?

I have a pretty good setup with a DAC/AMP + nice headphones. You might have a better setup but I think my hearing just isn't good enough.

Age impacts the frequency range that most people can hear. That might be a factor here too. I'm in my mid 30s, are you younger?

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