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More low-frequency energy in the 123 Hz condition was rated as having higher sound versus the 313 Hz condition (mean difference 11.2%, p = 0.001). Full-band conditions with more low- and high-frequency energy were higher than the other high-frequency cutoff conditions (mean difference range 12.9-15%, p 0.001). The direct drive system provides higher sound quality of both speech and music compared to narrowband conditions. Sound quality improvements were mainly attributable to low-frequency sound, but stimuli with specific high-fre
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