Dekoni Audio · Aftermarket replacement
Dekoni Audio Elite replacement earpads for HiFiMAN HE series (Sheepskin, Fenestrated Sheepskin, Hybrid, and Elite Velour options)
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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dekoniaudio.com
Dekoni’s article explicitly names the HE-4XX as compatible. It says the pads were specifically tuned and measured with the HE-400i, not the HE4XX.