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Amazon.com: Sescom SES-LZSLHZ-XF14 Professional Low Z to Switchable Lo or Hi Z Impedance Matching Transformer : Electronics
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