As a former choral director, I've not come across small or little when describing a voice. Thin is commonly used to compare a voice to a full one. Low is used to describe the range of voice (bass, baritone, tenor, alto, soprano).
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Son JamesI want to say, since your voice is very small ( she spoke in small voice), I couldn't hear you.I want to say, since your voice is very soft ( she spoke in soft / quiet voice), I couldn't hear you.