Bi-directional FMODcables with a choice of two crossover frequencies depending on installation direction. Perfect for those that are not sure of the exact frequency needed. Similar to the FMOD but user has a choice of two frequencies such as 70 or 100 low pass at 12db per octave. Each end has a 6" pair of male RCA plugs since this is a two channel (stereo) device. Passive device so there is no noise or distortion (transparent to your system). Color coded for crossover points.