Brainwavz · Aftermarket replacement
Brainwavz XL Round earpads (XL Round collection; styles/materials vary)
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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brainwavzaudio.com
Brainwavz’s own compatibility chart explicitly lists Superlux HD681 in its XL Round compatibility section. The page describes the chart as a guideline based on models tested by Brainwavz or reported to work by customers.