Line input transformers provide the maximum possible Common Mode Rejection of unwanted signals. All models have a single Faraday shield and a 30dB magnetic shield can. Models are available in 1:1, 1:1.4, 1:2, 2:1 and 4:1 ratios. Several models are also available as octal plug-in versions. This transformer is optimized to provide unparalleled low frequency response while providing over 100dB of common mode isolation. Low frequency distortion has also been reduced to provide accurate reproduction of the very lowest musical frequencies. The ultimate solution for sub-woofer amplifier input isolation.