HD-681 Evo WH : Pretty good after easy mods
First impression wasn't great. Too much bass and mids and highs sounded rather muffled. After finding the great modding articles on diyaudioheaven, I changed out the earpads for the velours ones, which reduces the bass, and removed the felt pads lightly glued in front of the drivers. The latter improved the mids and highs, and made the sound a bit more airy.
However, if I have to recommend a pair of Superlux headphones, it would be the 662 HD EVO. They sound good out of the box and can be improved by using the velours pads and optionally other mods.

Technical Data
- Manufactured by Superlux
- Released in 2013
- Average price : $35
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