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The average preferred listening levels of (A) pop-rock music and (B) classical music for earbuds (n=23), headphone (n=23), canal earphones (n=23), and CP with NC (n=10) in quiet and noisy conditions. Each value in headphone, canal earphones, and CP with NC is statistically compared with that in earbuds. Open symbols: quiet environment; closed symbols: noise environment; vertical bars: standard deviation. *p<0.01. CP, canal earphones; NC, noise cancelling.
