Observations and results
Were two ears better than one in identifying distance and direction? Was direction more difficult to guess with one ear when you and your partner were closer to one another?
Each ear receives information that is sent to your brain. Because your ears are not side by side, they receive different information. If someone standing to your left claps his hands, your left ear will receive this sound wave more quickly than your right one. In addition, the clap will sound louder in your left ear than in your right . Your brain uses these differences to better understand where a sound is coming from. This can also explain why—as you may have noticed—it's hard to tell the difference between a sound directly in front of or behind you, even if you are using both ears. When the sound source is exactly equidistant to both ears, they receive very similar information and your brain has fewer clues as to where the source may be.
If indoors, remove tape from the floor.
More to explore
One Ear Is Not Like the Other, Study Finds from Scientific American
Our Sense of Hearing from Neuroscience for Kids
A Brain Map of Auditory Space from the Howard Hughes Medical Institute
Your Ears from KidsHealth
How Hearing Works from How Stuff Works