Acoustimass 300 wireless bass module. DESIGNED FOR THE SOUNDTOUCH 300 SOUNDBAR Thunderous bass. Wireless connectivity. Love your new Sound Touch soundbar but want to kick the performance up a notch? Add the Acoustimass 300 wireless bass module—it's the difference between hearing bass & feeling thunder. Designed exclusively for the Sound Touch 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 & provides a more immersive experience for everything you listen to or watch.