Features: [ High-quality totally passive audio interface [ Uses a pair of high-performance transformers to totally separate input and output signal grounds [ Isolating two systems and reducing hum and ground-loop noise [ Extremely flat and wide frequency response [ Can handle high signal levels [ Very clean and neutral sound with a wide variety of signal sources [ Designed to be used with impedances from 600 Ohm to 100k Ohm [ XLR, 6.3-mm jack, and RCA phono connectors on all inputs and outputs [ Compact, black anodized all-aluminum case