Audiometry and Hearing Loss Examples An audiogram shows the quietest sounds you can just hear. The red circles represent the right ear and the blue crosses represent the left ear. Across the top, there is a measure of frequency (pitch) from the lower pitched sounds on the left going to higher pitched sounds on the right. Each red circle and blue cross represents the individual frequencies of sound that have been presented. These sounds are measured in Hertz. Down the side of the audiogram, there is a measure of loudness. At the top of the graph are the very