Minor Illusion (Improved)

Casting Time: 1 action; Range: 30 feet
Components: S, M (a bit of fleece), Dur: 1 min.
You create both a sound and image of an object within range that lasts for the duration. The sound's volume can range from a whisper to a scream. The image can be no larger than a 5-foot cube. If a creature uses its action to examine the sound or image, the creature can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell DC.