Conclusion: The Denon AH-C400 are high-end dual micro armature earphones that have a largely accurate, neutral sound. They’re designed for discerning types, not basshounds. They sound best at low-to-mid volumes and don’t have a removable cable, though.
Pros: Balanced and mostly neutral sound, Well-controlled bass
Cons: Some bass distortion at high volume, Mids a little forced at high volume