French · Pronunciation Guide
ahn-SAHN-bluh — two identical nasal vowels and a fading "bl" cluster at the end.
en-SEM-ble, with the weight on the middle syllable, since the trailing "-ble" has no real vowel. Two matching nasals bracketed by an "s" and a fading cluster.
Listen: ensemble
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On y va ensemble.
We're going there together.
Listen: On y va ensemble.
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"On y va ensemble" carries an obligatory liaison at the start: "on y" is /ɔ̃.n‿i/, so the nasal releases into a real "n". Then "va ensemble" simply runs together across the vowels. Note that "on" here means "we", which is what French speakers actually say in conversation.
English borrowed "ensemble" for musical groups, complete with real "n" and "m" consonants and a full "-bull" ending. French has two nasal vowels with nothing touching, and an ending that fades to almost nothing. The two nasals are identical, which helps — get one right and you have got both. Then let the "bl" trail off rather than resolving it.