Hi. Yes, at quality settings lower than 5 (which is --standard), the maximum bandwidth is lower than 20 kHz.
At --quality 7 it's 22 kHz, --quality 5: 20 kHz, --quality 4.5: 17.9 kHz, --quality 3: 13.1 kHz, etc.
You can view verbose encoder details by adding --verbose to the command line. (mpcenc --verbose input.wav output-customname.mpc)
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