RDL ST-MX3 3-Channel Audio MixerThe ST MX3 is a line level mixer module in the STICK ON Series of products. It provides audio mixing of three line level inputs with individual input gain adjustments. The line level output is capable of driving either high or low impedance, balanced or unbalanced loads. The ST MX3 operates from ground referenced floating or bipolar dc power. For installations with microphone level inputs, use the ST UMX3 Universal Audio Mixer.