The onsite DIN test scores (dB SNR) for sound presentation (shown on the left and right sides for diotic and antiphasic, respectively), starting SNR (shown in the white or gray shade for low and high, respectively), and mixing method (shown in green, blue, and red colors for fixed-speech, fixed-noise, and fixed-level, respectively). The boxplots show the lower and upper quartiles and the lines show the median scores of participants. The dots represent outliers, and the whiskers indicate the lowest and highest data points within plus or minus 1.5 times the interquartile range.