For balancing and isolation of line-level outputs from mixers, equalizers, crossovers, and other equipment. 4 channels, each with 1/4" (6.35mm) T/R/S andfemale XLR-type input, and 1/4" T/R/S and male XLR-type isolated output withground lift switch. Uses Pro Co LOT-1 transformers (600Ω 1:1).