Sennheiser HD 660 S2 headphones are a sound upgrade to a modern classic

Sennheiser’s HD 660 headphones have become something of a weapon of choice for audiophiles with their superb soundstage and excellent dynamic delivery. But critical listeners have nit-picked their low-end performance, something Sennheiser has acted on with a newly-unveiled updated version of these modern classics, called the Sennheiser HD 660 S2.

We first took a look at the original Sennheiser HD650 all the way back in 2008, and were blown away by their natural tonality and comfort. A tweaked version, the Sennheiser HD 660 S, featuring more prominent treble and redesigned casing would be introduced almost decade later in 2017.