Love your new SoundTouch soundbar but want to kick the performance up a notch? Add the Acoustimass 300 wireless bass module — it's the difference between hearing bass and feeling thunder. Designed exclusively for the SoundTouch 300 soundbar, it's the best Acoustimass module we've ever designed for any of our home cinema systems. In fact, it's the best performance you can get for a subwoofer this size. It connects wirelessly to the soundbar and provides a more immersive experience for everything you listen to or watch.