Dekoni Audio · Aftermarket replacement
Standard Size Oval Replacement Earpads for Studio Monitor Headphones
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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dekoniaudio.com
Dekoni’s product page explicitly lists ATHM30X among the fits and provides dimensions of 101 mm × 74 mm, a 60 mm × 32 mm inner opening, and 20 mm thickness.