1.Stereo 2-way or Mono 3-way crossover. 2.Four steps Butter Worth filters and 12dB/octave. 3.Overrun low frequency cut and phase correct function. 4.Frequency point is continuous adjustable. 5.The frequency output may select stereo output or mono superpose output. 6.SC 223 has 1/4 TRS socket. 7.Double circuit configuration. 8.SMT( Surface Mounting Technology), reliable performance