The SB20T1 from Whirlwind is a 20 input passive microphone splitter with one direct and one isolated output for each input, for a total of 40 outputs. Each input has a 3-pin XLR female connector and each output has a 3-pin XLR male connector. The SB20T1 is built from heavy cold-rolled steel to withstand the rigors of day-to-day use.
Whirlwind SB20T1 Specs
20 x XLR Female
40 x XLR Male (20 x Parallel, 20 x Transformer Isolated)