For balancing and isolation of line-level outputs of mixers, equalizers, crossovers and other equipment. 1/4" (6.35mm) T/R/S and female XLR type input (with parallel 1/4" (6.35mm) and male XLR-type output); 1/4" (6.35mm) T/R/S and male XLR type transformer isolated outputs with ground lift switch. Uses built in LOT-1 transformer (600 Ohms 1:1).