Power Acoustik C-3184 3-Way Electronic Crossover 3-Way Electronic Crossover. The front and rear outputs of C-30XR have a 12dB 50Hz-7.5kHz variable high-pass crossover. Dedicated subwoofer output has a 12dB 50-120Hz variable low-pass crossover.Make your subwoofers come alive! Subwoofer level control conveniently adjusts the subwoofer output level. Utilize a 45Hz bass boost for up to an additional 12dB of subwoofer output gain. 6-Channel Low-Level Input and 6-Channel Low-Level Output w/ 5V Gain; 2/4 Channel Input Selection; Independent Front/Rear High Pass; Independent Subwoofer Low Pass Stereo or Mono Subwoofer Output Selection; 180 Phase Switch; Variable Gain 45Hz Bass Boost; S/N Ratio: 100dB; Channel Separation: 70dB