Dekoni Audio · Aftermarket replacement
Dekoni replacement earpads for Philips Fidelio X2, X2HR, and X3 (Choice Leather, Choice Suede, or Elite Velour)
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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usa.philips.com
Philips identifies its wired open-back Fidelio X3 as model X3/00, resolving the target headphone.
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dekoniaudio.com
Dekoni's article also explicitly says its Philips Fidelio X2 replacement pads fit the X2HR and X3, and names the Choice Leather, Choice Suede, and Elite Velour options.