* amp-in feature allows your amplifier s speaker output to feed the console. * now your amplified sound can go directly into the console without time-consuming microphone selection & placement. * boost guitar & bass signals up to line level for direct-tomixer connections via either low-z or hi-z inputs. * die-cast aluminum chassis for incredible strength. * ground-lift switch breaks ground-loops reducing 60-cycle hum. * no-compromise electronics for worldclass performance. * automatically switches from 9-volt battery (included) to phantom power when phantom power is present.