Sennheiser HD 660S2 Review (2026): The Modern 300Ω Upgrade
On sale the HD 660S2 costs about $100 more than the HD 650. Measurements show what that buys in bass and treble, and …
$480
Apr 21, 2026
Modern
On sale the HD 660S2 costs about $100 more than the HD 650. Measurements show what that buys in bass and treble, and …