What's the correct transcription and pronunciation of the 'un-' prefix in General American English? Cambridge Online dictionary provides the following transcription: /ʌn/
It's the same in words with this prefix: /ʌnˈdu/. Why do they use the /ʌ/ and not the /ə/ (schwa)? It's the /ə/ sound that typically occurs in unstressed syllables. Thank you.