HD 660S2 Smart Control App When combined with its ultralight

When combined with its ultralight chassis and luxurious comfort

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

which are responsible for a multitude of distortions

The new audiophile standard

HD 660S2 Smart Control App When combined with its ultralightDive 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