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
10pcs/lot Transformer For Shure Sm57 Sm 58 Sm58lc Sm58s Sm58sk Wired Microphone - Microphone Accessories - AliExpress
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Parallel Recording Using A Microphone Splitter Transformer - Sonarworks Blog