The B-112A in our 'OG' aesthetic perfectly complements our A3 speaker by adding significant bass capability. 
 
It's a 75 litre (internal) box containing a high performance hifi woofer / subwoofer driver. This box / driver combo will reach down to 20Hz in room.
 
The speaker features a power-pack mounted on the rear with Digital Signal Processing (DSP) and 1200 watts of power.