Sennheiser HD 660S2 Review (2026): The Modern 300Ω Upgrade
The Sennheiser HD 660S2 fixes the HD 650's two weaknesses — sub-bass and treble roll-off — for $170 more. Whether that …
$499
Apr 21, 2026
The Sennheiser HD 660S2 fixes the HD 650's two weaknesses — sub-bass and treble roll-off — for $170 more. Whether that …
Sennheiser HD 600 vs HD 660S2 — sound differences, amp requirements, price gap analysis, and an honest answer on whether …