Cadence Acoustics CXR7 3-Way Electronic Crossover with 7V Line Driver Fully Adjustable Frequencies Multi-Link two CXR-7's for Additional 6 Channels of Output.Frequency Response 10Hz  30 kHz (-3dB) Adjustable Parametric Bass Equalizer with a Selectable Bass Boost Phase Shift-Control Audio Stereo/Mono Selector