PFMOD 2W-1 two-way adjustable crossover. By removing factory jumpers in the high pass section you can select 50hz, 70hz, 100hz, or 150hz at 12 db per octave. Each high pass channel crossover frequency can be selected independently. This is a two channel device (stereo). The low pass section has two mono-mixed outputs with 16 selectable crossover frequencies from 42hz to 200hz at 18db per octave. Perfect for bi-amping your system. Passive device so there is no noise or distortion (transparent to your system).