Why does the Siri voice sound different?

L3us4 Said:

"The sound of voice that speaks when a message arrives is different than it was before."

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Siri Anomaly:

Not certain then. So, make sure it is Siri. IF you are in an enclosed location (i.e. closet), then you may hear a deeper voce.

See Here: Change Siri Voice or Language - Apple Support

L3us4 Said:

"Why does the Siri voice sound different?"

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Sound different than what? There are different voices. Not just Siri.