The Palmer PAN 04A is an active two-channel DI box designed to feed unbalanced, high-impedance instrument signals into mixing console microphone inputs. Its active circuitry ensures an unaffected frequency response and high dynamic range, while premium balancing transformers provide electrical isolation to eliminate ground loop hum. A standout feature is the additional balanced mono summed output that merges the signals from both channels. Each channel is equipped with a switchable -30 dB attenuation pad and an individual ground lift switch. Housed in a rugged sheet steel enclosure, the unit is built for professional stage and studio use. Powering is flexible, supporting either an external DC adapter or phantom power.