12V Low Pass Speaker Subwoofer Crossover for 8 Ohm or 4 Ohm 12V Lowpass Subwoofer or Speaker; Crossover for 12V Mobile Stereo Systems. 1 Crossover is good for 1 Speaker or Subwoofer. Handles 200 Watts RMS, 400 Watts Max. 120 Hz Low Pass. 12 db Octave Slope @ 4 Ohm.