Bose - Active PowerBass Speaker

The Bose Active PowerBass speakers, also known as the Acoustimass active subwoofers, deliver deep and room-filling bass. Thanks to the amplifier, these active speakers take the load off you completely when producing the lowest frequencies. Bose uses patented multi-chamber technology, keeping the bass compact while still sounding powerful and distortion-free. The sound is warm and dynamic, ideal for an intense movie experience or powerful music. They perform best when driven via a dedicated subwoofer output (LFE).

Specifications:
Type: Active powered bass module / subwoofer
Frequency Response: 28 Hz – 200 Hz

The subwoofer works perfectly.
For a better impression see photos