Q Acoustics 3070s Active Subwoofer The 3070S subwoofer perfectly complements all Q Acoustics 3000 and 2000i series stereo and centre channel speakers. And of course; because it’s a Q Acoustics product, its twin, long throw, 6½ inch drive units and powerful 140watts rms amplifier, enable the 3070S subwoofer to beautifully reproduce the fast ‘twang’ of a double bass just as well as exciting movie soundtracks.