Pro Co's iFace accepts a consumer grade headphone level signal, such as an MP3, portable CD player or a laptop computer, and converts the signal to a professional grade, balanced output suitable for connection to any common mixing consoles input. The iFace provides both a 3.5 mm (1/8") and recessed left/right RCA inputs for easy connection with standard patch cables and a stereo/mono switch to provide passive summing to a dual mono feed where required. The outputs are isolated via audiophile-grade Pro Co MBT-1 Microphone Bridging Transformers and appear on standard 3-pin XLR male connectors. The transformers offer wide bandwidth and low distortion and phase shift, and are magnetically shielded in mu-metal cans and electrostatically isolated with dual Faraday shields. The result is near-ideal rejection of common-mode signals from all sources of RFI and EMI, including radio pickup, SCR dimmers and 60 Hz hum. The ruggedly constructed "Uni-Box" enclosure is formed of extruded aluminum side channels and 16-gauge steel top, bottom and end plates, designed to protect switches and connectors from accidental damage while also providing magnetic shielding for the circuitry. Industrial-grade connectors and switches provide trouble-free reliability even in abusive situations such as remote broadcast and recording operations.