The Whirlwind IMP 2 Passive Single Channel Direct Box for PA or Studio is a rugged built, single channel, passive direct box. The unit converts a line or instrument level unbalanced signal to a low impedance microphone level balanced signal. Direct boxes are often referred to as DI boxes. This stands for Direct Injection as their main purpose is to convert unbalanced and/or high impedance instrument signals into a format suitable for direct connection to a mixing console - without the use of a microphone. Includes: Whirlwind IMP 2 Passive Single Channel Direct Box for PA or Studio - Whirlwind 3 Year Warranty Features: Ground Lift switch to help isolate hum and buzz Uses Whirlwind's TRHL transformer Specifications: Type: Passive Input Connections: 1 x 1/4 TS phone Output Connectors: 1 x XLR 1 x 1/4 TS phone Thru Impedance Ratio (Input to Output): 133:1 Frequency Response: 20Hz-20kHz +/-1dB Level Change: (Input to Output): -20dB