Amazon.com: Shure A85F Line Matching Transformer - Low Z Female XLR to High Z 1/4-Inch Phone Plug connects a Balanced Low Impedance Microphone Output to an Unbalanced High Impedance Input : Everything
Amazon.com: Premium Direct Injection Audio Box - Passive DI Unit Hum Eliminator w/ Input Attenuator to Connect Guitar & Bass - 1/4 Inch Impedance Transformer Connector to Balanced & Unbalanced XLR -
Amazon.com: E-outstanding 2-Pack TV Antenna Connector 300 Ohm to 75 Ohm Coaxial Cable Matching Transformer UHF/VHF/FM Model TV Converter : Electronics
Amazon.com: Dual Transformer Lsolator Hum Eliminator denoiser Noise canceller With input attenuator connection guitar and bass - 1/4 inch impedance transformer equilibrium and non-equilibrium XLR connector : Musical Instruments