In this audio titled "Door Knob 2", the prominent sound is of a door being interacted with. Initially, there is the clear, metallic noise of a door knob being turned - it's a distinctive clicking sound that denotes a handle being twisted. This is followed by the creaking noise of the door being pushed open, a sound that carries an air of suspense. Suddenly, the tranquility is shattered by the sharp, echoing slam of the door, a sound that resonates for a moment before fading away. The door knob's role in this audio is evident from the beginning to the end, highlighting its importance in our everyday life. The audio ends on a quiet note, leaving behind the memory of the door knob's distinctive sounds.