Yamaha HS8S Active Subwoofer
One thing to keep in mind though is that it's very sensitive to the positioning (like any sub). If I put it in the corner a bit out of sight, then it creates a room mode in the opposite corner with greatly amplified bass, while there's almost nothing in the centre of the room. So need to play around with it, and adjust for your listening position. Something to keep in mind.
Overall very happy with the purchase.