A 45-year-old man presents with progressive unilateral hearing loss and tinnitus. Pure-tone audiometry shows mild-to-moderate sensorineural hearing loss (PTA 35 dB). Speech audiometry reveals a word recognition score (WRS) of 35% at optimal presentation level, which DECREASES to 28% at higher intensities. The performance-intensity curve demonstrates the pattern marked **A** in the diagram. Which of the following is the most appropriate next diagnostic step?
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