Her voice issued out of a hidden speaker, laced with static, but still clearly the woman they knew.

To enhance the sense of reality, a $200,000 sound system with hidden speakers will play sounds recorded in an African rain forest.

A mechanized voice blared out of a hidden speaker in the walls.

A gentle voice spoke from the hidden speakers in the walls.

The hidden speaker said, "Their threat warning system is very good.

Startlingly close, a disembodied voice came suddenly from a hidden speaker.

A female voice came over a hidden speaker: "Good afternoon.

Quite obviously, there couldn't possibly be any hidden little speakers.

The train screamed through its hidden speakers as flames took hold of the carriage.

Since 1995 it has been on display again, together with artificial terrain and hidden speakers playing realistic sound effects.