Jensen direct box transformers are the ideal choice for coupling guitar pickups, musical instrument and other line level outputs to low impedance microphone inputs. They also give excellent results when used as an output transformer for Tube type condenser microphones. Direct Box transformers provides ground isolation and allow long cable runs from high impedance sources without excessive bandwidth loss. When loaded by the 1kohms input impedance typical of mic preamplifiers, this transformer has 140kohms input impedance, making it ideal for high impedance sources. It can be used with or without an active buffer as a direct box for electric guitars or synthesizers. A 30dB magnetic shield package is standard.