Built rugged on the inside and outside, the Whirlwind IMP2 passive direct box is a mainstay ofpro systems everywhere. It converts a line or instrument level unbalanced signal to a low impedance mic level balanced signal quickly, efficiently and quietly.Whirlwind IMP2 Features:1/4″ parallel wired in/out jacksGround Lift switch to help isolate hum and buzzUses TRHL transformer that’s riveted, not glued, to the chassisImpedance Ratio (input to output): 133:1Frequency Response: 20Hz-20kHz 1dBLevel Change: (input to output): -20dBRugged steel enclosureDimensions (W x L x D): 2-5/8″ x 4-3/8″ x 1-3/8″