Sennheiser HD660S2 Open Circumaural Audiophile Headphones

Feel the music like never before with the HD 660S2, where intimate sound meets extended sub bass for a deeply moving audio journey. This remarkable headphone creates an incredibly natural and balanced listening experience that draws you closer to your favourite artists and instruments. The non-fatiguing signature provides breathtaking resolution and precision, making every session feel as though the performers are right there in the room with you.

What sets the HD 660S2 apart is its masterful handling of sub bass frequencies — traditionally a challenging area for audiophile headphones. While many models struggle with sloppy or boomy low-end response, Sennheiser has achieved something special here. The extended sub bass reaches down to capture the lowest notes of a concert piano at 27.5 Hz and the low B of a 5-string bass at 30.9 Hz, all while maintaining extraordinary precision and balance throughout the entire frequency range.

The magic lies in how this extended low-end response changes your entire listening perspective. By doubling the sound pressure at the very lowest frequencies, the HD 660S2 creates more space for the sound to breathe. Against this deeper backdrop, the highs feel more brilliant, the soundstage opens up considerably, and emotional connection to the music becomes stronger. Combined with exceptional comfort that encourages extended listening sessions, the HD 660S2 offers an intimate musical connection that’s hard to live without once you’ve heard it.