DS18 XOHV Pre-Amp With Crossover For High Volt Amplifier Increase your systems signal to line-level with DS18’s XOHV! This 2-channel Pre-Amplifier has a built-in Crossover and selectable bass boost frequency with high volt input and output! The XOHV is designed to work in line with H-V amplifiers that usually don’t have these features equipped. This Pre-Amplifier’s 2-Channel capabilities allow you to connect 2 or more amplifiers for insane results! Increase your signal strength today with the XO