Brand New - Audiotek ATK2/3X 2-4 Channel Input 2/ 3-Way Crossover for Mono, Stereo Subs Product Features:  For 2 or 4 channels inputs Sub in for receiver's with sub outputs Bass remote offers 12dB bass boost For mono or stereo subwoofer 180 degree phase shift  switch 45Hz bass boost with quasi-parametric EQ Level adjustment for front, rear, and sub channels Second order butterworth hi-pass front and rear channels Use multiple ATK2/3X via full range cascade output Product Specs: Output gain ratio   1:2 Channel separation  60dB Output voltage   8.5V THD   00.01% Signal to noise ratio   95dB Inputs   2 or 4 Channels Frequency response   10 - 30000 Hz