The 2x1SPLIT from Audio-Technica is a passive splitter/combiner intended for use with wireless audio systems and is compatible with all major brand wireless microphones and in-ear monitors. Use the 2x1Split to make an 8 channel IEM combiner, create a distributed antenna system, or to tap into you spectrum analyzer to get more insight into your setup. One BNC antenna in and two BNC out, or two BNC antennas in and one BNC out. R1 channel passes 12V DC if DC over coax is provided.