Dive deeper into legendary sound.

Nothing makes the music feel dramatic like powerful bass.
The extremely precise yet non-fatiguing sound of the Sennheiser HD 660S2
now delivers even more impact with extended sub-bass.

More impact and emotion
Breathtaking resolution and precision take you closer than ever to instruments and vocalists. Yet the sound is natural and balanced, never harsh or brash.

Sub bass expands the entire sound.
In doubling the sound pressure at the lowest frequencies, weve retained extraordinary precision and balance throughout the sub-bass, mid-bass,and beyond.

Extension on the low-end changes everything by creating more space for the sound. Against a deeper backdrop, highs feel more brilliant, the soundstage deeper, and emotions stronger.