The word ‘audience’ is typically pronounced as “aw-dee-uhns” or “awd-ee-uhns.”
The ‘au’ sound is like the ‘ow’ in “owl.” The ‘d-i-e’ syllable is like the word “dye” without the ‘y’ sound. And the ‘ns’ sound is like the ‘s’ in hiss.
To practice, you can listen to how native speakers say it by clicking this link:
https://dictionary.cambridge.org/it/pronuncia/inglese/audience
All together, it should sound like “aw-dee-uhns” or “awd-ee-uhns.”