Perfect bass performance in any room is not only possible, we've made it easy! Even when the finest subwoofers are perfectly positioned, the room can have a dramatic impact on performance. Paradigm's Perfect Bass Kit (PBK-1™) is a derivative of the critically acclaimed Anthem^® Room Correction (ARC) system. Based on research conducted by the National Research Council (NRC), our goal was to identify the correct in-room target response for a loudspeaker, in this case the subwoofer, then develop a way to achieve that same response in any listening room. Using proprietary processing, PBK-1™ measure your subwoofer's frequency response and then computes the target response to yield optimal bass performance in your room. One PBK-1™ can be used with up to four Paradigm^® Reference subwoofers. An audiophile solution to the problem of "the room"!