The Elite Core PMA is a high-powered stereo or mix-mono personal monitor headphone amp designed to provide loud and clear monitoring through headphones or earphones. Signals from AUX outs are connected to the inputs of the PMA via combo XLR/TRS jacks. Headphones or earphones are powered by a strong 50mW per channel amplifier. The PMA can be conveniently mounted onto standard mic stand threads. Powered by the included 9V adapter, or by a 9V battery