Sennheiser SK 500 G4 Wireless Bodypack Transmitter (AW+: 470 to 558 MHz)

The Sennheiser 509542 is a wireless bodypack transmitter that sits at the heart of the evolution wireless G4 500 Series. It works in the AW plus frequency range from 470 to 558 MHz and delivers audio that stays powerful and clear, even when the stage is crowded with other wireless signals. With 88 MHz of available bandwidth and 3520 selectable UHF frequencies, you can build large multi-channel setups without running out of clean channels.

Engineers and performers will appreciate how quickly the transmitter pairs with a matching receiver through the built-in IR sync. Once linked, you can move up to 330 feet, yet still enjoy a stable signal thanks to an adjustable RF output that you can set to 10, 30, or 50 mW to overcome local interference. The metal housing feels solid, clips comfortably to a belt or guitar strap, and holds up to life on tour, in houses of worship, or inside corporate event kits.

Power comes from two standard AA batteries or the optional BA 2015 Accupack, giving up to eight hours of operation for a full workday or an evening of back-to-back shows. The locking 3.5 mm input secures your lavalier microphone, headset, or instrument cable, so nothing comes loose mid-performance. If you already own earlier evolution wireless gear, the SK 500 G4 fits right in, as it remains backward-compatible and therefore protects your previous investment.

Whether you are mixing a theater production that needs dozens of reliable channels, equipping a presenter who needs hands-free mobility, or sending a guitar signal to a pedalboard-free stage, this transmitter offers the sound quality, range, and durability that professionals expect from Sennheiser.

Highlights:

• 88 MHz tuning range with 3520 selectable UHF frequencies for flexible channel planning
• Up to 330 feet (100 meters) of reliable transmission distance
• Switchable RF output at 10, 30, or 50 mW to manage challenging RF environments
• Backward-compatible with earlier evolution wireless systems for smooth integration
• Operates for up to eight hours on two AA batteries or the optional BA 2015 Accupack
• Metal housing that withstands daily stage or field use
• Locking 3.5 mm audio input keeps microphones and instrument cables secure
• IR sync enables fast, accurate pairing with the associated receiver