Enjoy an even more thrilling music and home cinema experience. The two Class D digital amplifiers with a frequency response of up to 25 Hz are perfectly tuned to the speaker's acoustic architecture, and the two force-cancelling drivers are inward-facing, allowing you to listen without distortion. The two acoustic ports are precisely tuned to enhance performance, and the sound settings are automatically equalized to achieve the ideal balance between the Sub and the paired Sonos speakers or components. Finally, the Trueplay software dynamically tunes the speaker to the acoustics of the specific room.