Siri isn’t speaking out loud

Siri's voice volume is independent of the system volume. So try this: Ask Siri a question and, during what will be the silent answer, long press the Volume Up button. (The key to changing Siri's volume is to change the volume while he/she is speaking.)

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Try this article please --> If "Hey Siri" isn't working on your iPhone or iPad - Apple Support

Siri is not speaking out loud on my iPad. I already reset everything.