The cable with 3.5mm 4Pole connector is suitable for Audeze MM-100, Hifiman HE-R9, HE-R10, HE-R10D, DEVA, DEVA Pro (if single sided entry is desired), Fostex T60RP, etc. The 2.5mm plug can only work on the player end, it cannot be connected to the headphone end.
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