Sonos Sub 4 White

Amplifiers: Dual Class-D digital amplifiers perfectly tuned to the subwoofer's unique acoustic architecture. Tweeters: Dual 5" x 8" elliptical woofers face inward for a force-cancelling effect that virtually eliminates distortion.
MidWoofers: Six midwoofers ensure faithful playback of mid-range frequencies.
Architecture: Ported cabinet enhances bass response.
Frequency Response: As low as 25 Hz
Dimensions: Height: 389 mm Width: 402 mm Depth: 158 mm