Sennheiser EW IEM G4 Transmitter

The SR IEM G4 is Sennheiser's half-rack UHF IEM transmitter — the box that takes your stereo mix off the console and puts it wirelessly into a performer's ears. It sits in the rack alongside your monitor console output or playback rig, receives a stereo feed (XLR on the left channel, quarter-inch TRS on the right), and broadcasts to the corresponding EK IEM G4 bodypack receiver worn by the artist. This is the core transaction of any wireless IEM system, and the G4 handles it reliably across a large installed base worldwide, which matters when you need a spare unit at 2 AM in a foreign city.

Half-rack width means two units share a single rack unit, which is genuinely useful when you're running IEM sends for a full band. At 14 watts nominal draw with an 18-watt ceiling, power budgeting is straightforward — a standard 20-amp circuit handles a healthy complement of these without drama. The asymmetric input configuration (XLR left, TRS right) is worth noting at patch time: it's not a standard matched pair, so label your cables and build a consistent patching habit or you will chase a phantom phase issue under pressure. The BNC antenna output gives you the flexibility to run coax to remotely mounted antennas when stage geometry makes direct radiation from the rack impractical.

The G4 is the right call if your performers or your organization are already in the Sennheiser ecosystem, if you need a proven, widely-serviced platform without writing a check for a Shure PSM 300 or 900 system, or if you're building out a multi-channel IEM rig where rack space efficiency actually matters. It is not the answer if you're in a dense RF environment and need the more sophisticated coordination and filtering tools found in higher-tier systems, or if your inputs are exclusively XLR and you'd rather not manage the mixed connector situation on the right channel.