Bass Power 250, Mono Class A-B Subwoofer Amplifier for Cinema Sub 10 & 12Amp Great bass is still an integral part of any music and theater system. From the rumblings of a distant thunderstorm to the in-your-face percussive attack of a kick drum, deep, resonant bass is responsible for much of the emotional impact of any audio system. Since the volume of air movement needed to create this effect is substantial, subwoofers with dedicated enclosures and amplification have become a necessary component in all high-performance systems. Built to deliver reliable SpeakerCraft performance. The Bass Power 250 pumps out amazing power, providing huge electrical torque to move and control the SpeakerCraft subwoofer family.