58x Apr 2026

Slightly wider than the 6XX, providing better spatial imaging, though it remains a generally intimate open-back experience. 2. Design and Comfort

Generally comfortable, but known for a high clamping force out of the box that breaks in over time. Driver: Features a unique Slightly wider than the 6XX, providing better spatial

-ohm driver, making it significantly easier to drive than the 300-ohm HD 6XX. 3. Power Requirements Slightly wider than the 6XX

Vocals are intimate and present. It is often described as a slightly warmer, tighter, or "thinner" sounding 660S. providing better spatial imaging