I'm sure temperature & humidity has quite a large effect on sound quality. A few years back I was sound engineer for a ten piece band, the performance was for a golf club. The outside temperature was about minus ten centigrade but the performance area was comfortably warm. After satisfactory sound checks the performance sounded really good until the heating system failed. I was amazed by the change in sound as the temperature rapidly fell, the previously full sound was replaced by a thinner sharper sound and I remember my race with EQ settings to keep up with decending room temperature. The heating system was later restored as was the EQ. I never imagined a change in temperature would have such a large affect.
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