Best Amp for Sennheiser HD 660S2 (2026): Current Picks + Power Math
The HD 660S2 ships with a 4.4mm balanced cable, and that changes which amp is the best value. Current picks from $119, …
Oct 10, 2026
Hd-660s2
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
Sennheiser HD 600 vs HD 660S2 (2026): Is the Upgrade Worth It?
On sale the gap is about $130 in October 2026. What the HD 660S2 adds over the HD 600, who should skip it, and the …
Mar 30, 2026