If you need to provide a complete band with wireless in-ear monitoring, you will have to face a jumble of antennas in your rack. Bundling signals and transferring them via one antenna is the ideal solution, in this scenario. With the Sennheiser AC 3, up to four wireless monitor transmitters out of the EW series can be serviced while you are using only one antenna. The SR 300 IEM G3 transmitters are powered via the BNC cables, so that no separate power supply is required for the transmitters. The AC 3 requires a separately available NT 3-1 power adapter to function.