11:47HD660S2 - The side-grade we've been waiting for?
The reviewer finds the HD 660S2 to be a well-built, comfortable headphone with a darker, warmer sound than the rest of the 6x0 line due to a recessed 3kHz region, which reduces intimacy but can improve spaciousness on some tracks. It's not a technical upgrade over the HD 650 or 6XX, and the bass is not significantly increased, making it a side-grade that suits specific tastes rather than a universal recommendation.
Reviewed productSennheiser HD 660s278

















