Check the listing for details. RDL EZ-HSX4 Stereo Audio Input Switcher with Headphone Amp - 4X1. Condition: New. Listed at 175.00 USD. The EZ-HSX4 is a stereo audio source selector with an output volume control. Line-level and headphone outputs are provided. This unit is ideal as a four input headphone amplifier and as a source selector feeding an associated audio amplifier. The EZ-HSX4 is used in stores, houses of worship, studios, sound booths, home component systems and commercial sound systems. Four Input Source Sel+E327ectionUnbalanced Stereo Audio Inputs and OutputInputs and Line Output on Rear-Panel RCA JacksLine Output Switchable Fixed (Unity Gain) or VariableVariable Output Follows Front-Panel Level ControlHeadphone Output on 1/4″ (6.3 mm) and Mini-JacksHeadphone Output Follows Front-Panel Level ControlFull-Size Interlocking Pushbuttons on Front PanelEasy-to-Push Large ButtonsSolid-State Audio SwitchingSwitch Noise Cannot Affect Signal Quality