Advanced preamp which accepts both XLR and 1/4 inch jack inputs, and provides both dry (line level for FOH) and equalized XLR outputs. - AC power -  controls for gain, bass, treble, resonance (180Hz filter) and volume  w/ pouch and PSU, plus USB-to-12V converter (allows operation with a power bank) Especially useful with Schertler electrostatic and dynamic transducers