Alto X-P234 Active Crossover is a professional, high-precision stereo/mono crossover, providing advanced features for various sound systems. Its 24dB/octave Linkwitz-Riley filters and flat summed amplitude response ensure precise frequency control. Each band has individual output level controls and limiters for optimal speaker protection, as well as mute switches and phase reverse switches for easy adjustment and correction. Additionally, it offers CD horn equalization, low sum function, adjustable time delay, and 25Hz subsonic filter.