ART CX311 2 Way Stereo Crossover (with Extra Subwoofer Out)The CX311 two way stereo crossover network has an additional subwoofer output for low end frequency reinforcement. It employs 24dB octave state variable, Fourth order Linkwitz Riley filters that guarantee properly phased outputs at all frequencies which is optimal for the proper acoustic summing of common signals from adjacent drivers in the crossover region. Each channel features independent high and low output level controls and a crossover