The Sennheiser HD 660S2 has been on my radar as a recommendation for anyone looking to step up from the HD 650, and at $419.81 it’s now $260 off its $679.95 list price. That’s a 38% cut on what is arguably Sennheiser’s most accomplished open-back headphone in this range, and it brings it into a price bracket that’s very hard to argue with.
What you’re getting
The HD 660S2 is a direct evolution of the HD 650 lineage, but the most meaningful change is the bass extension. Sennheiser redesigned the transducers to reach lower frequencies with more authority, addressing the one area where the HD 650 left some listeners wanting more. The result is an open-back headphone that retains the warm, natural midrange the 650 is known for while adding genuine weight at the low end.
Like its predecessor, the HD 660S2 is a 300-ohm design, so you’ll get the
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