HD 660S2 Smart Control App The reference-grade 42mm transducer with

The reference-grade 42mm transducer with 38mm diaphragm and ultra-light 150-ohm aluminum voice coil delivers exceptional impulse response and smooth sound for which the entire 600-series is renowned

Thanks to angled drivers and an open-back design

The new audiophile standard

the standard setter for extended listening is now the standard-setter for extended bass

Sennheiser HDB 630 Wireless Audiophile Headphones - High-Res Sound with Parametric EQ and Crossfeed

HD 660S2 Smart Control App The reference-grade 42mm transducer withDive deeper into legendary sound. Nothing makes music feel dramatic like powerful bass. The extremely precise yet non fatiguing sound of the HD 660S2 now delivers even more impact with extended sub bass. Our engineers optimized the HD 660S's surround, transducer airflow, and coil to double the sound pressure at the lowest octaves. You can feel the lowest note on the piano (27. 5 Hz) or the bass drum kick (45 60 Hz) as if you were there. The relaxed