Wilson Audio Active XO Cross-overThe ActivXO is the long awaited and thoroughly updated replacement for Wilsons revolutionary Controller. It is a two channel, fully analogue electronic crossover with an array of features. It can be used in conjunction with a dedicated music system, or as the subwoofer control unit in a home theatre system. In systems used for the enjoyment of music and surround the film, the ActivXO is configurable to accommodate both optimally and simultaneously.