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©2013 UpToDate ® Print Email Audiogram with consonant and vowel sounds Normal audiogram, showing hearing thresholds for the right (blue circles) and left (red x's) ears. Normal thresholds are at or below 25 dB (shaded rectangle). The frequency and loudness of normal conversational sounds is shown in grey letters. Vowels tend to be lower in frequency and louder, while the consonants, which carry the majority of meaning of words, tend to be of higher frequency and softer.