1.DBX 223XL crossover 2.Stereo 2-way/mono 3-way crossover 3. ... frequency summed (subwoofer) output 4.40Hz high pass filter DBX 223XL Stereo 2/3 Way, Mono 3-Way Crossover FeaturesTRS differentially ... -riley, 24 dB/octave, state-variablePackage included1x DBX 223XL CrossoverOriginal Package DBX Crossover 223XL Stereo 2-Way/Mono 3-Way Crossover with ...