Open-back reference headphones
The HD 600's sibling, with the same open-back, modular design but a tuning most reviewers found slightly warmer. It is rated more sensitive, so it plays louder from the same source.
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Warmer tuning
Most reviewers found it slightly warmer and less bright than the HD 600, with a smooth, natural midrange.
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More sensitive than the HD 600
It is rated 6 dB more sensitive than the HD 600 at the same impedance, so it gets louder from the same source. Most reviewers still recommend a dedicated headphone amplifier.
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Comfortable for long sessions
Reviewers found the velour pads comfortable for hours of listening, though some found the clamp firm.