**We are an authorized Hifonics dealer**The **Hifonics HFXR** active crossover that features 2 channel or 4 channel with 8.5 volt line driver. Select 2 or 4 channel inputs with input switch. A crossover is designed to allow your speakers, subs or tweeters only the range of frequencies that they were designed to reach.Other features include the direct sub in receivers with sub outs 0 ? 12dB bass boost at bass remote, second order Butterworth front and rear channel high pass and level adjustments for front, rear and sub channels.Selectable for mono or stereo woofers180? phase shift switchMaximum pre amp output: 8.5v RMS45Hz bass boost w/ quasi parametric EQ