Sennheiser SK 100 G4 Wireless Bodypack Transmitter

Product Overview

The Sennheiser SK 100 G4 is a professional bodypack wireless transmitter from the Evolution Wireless G4 100-series system, designed for performers, presenters, and production teams who need reliable cable-free audio transmission. It pairs with the EM 100 G4 receiver and supports 1,680 selectable UHF frequencies for interference-free operation in demanding RF environments. The rugged all-metal housing is comfortable to wear for extended sessions on stage, in the classroom, or on set. Whether clipped to a belt, sewn into a costume, or worn under clothing, the SK 100 G4 delivers consistent, high-quality wireless audio with the reliability that Sennheiser's Evolution Wireless platform is known for.

Product Description

The SK 100 G4 features a locking 3.5mm input connector that securely accepts Sennheiser-compatible lavalier and headset microphones, as well as instrument adapter cables for guitar and bass applications. The adjustable input sensitivity allows the transmitter to be tuned to the output level of the connected microphone or instrument, preventing clipping on loud sources and maintaining a healthy signal-to-noise ratio on quieter ones. Sennheiser's HDX compander system processes the audio signal to deliver low-noise, wide-dynamic-range transmission across the UHF frequency band.

Up to 8 hours of continuous operation is available on two AA batteries, covering a full day of live performance, multi-session conference use, or extended video production shoots. Side contacts on the transmitter body allow the optional BA 2015 Accupack rechargeable battery to be charged in-place using the L 2015 quick-charging unit (both available separately), so you can recharge between sessions without removing the battery pack. A backlit LCD display shows frequency, group, channel, battery status, and RF output, giving the talent or an RF technician at-a-glance system status.

Infrared sync with the EM 100 G4 receiver links transmitter and receiver to the same frequency in seconds. The programmable mute switch allows talent to silence their mic between takes, and a lockout option prevents accidental activation during live performances. The SK 100 G4 is backward-compatible with all previous Evolution Wireless generations — G1, G2, G3 — and is also interoperable with select EW 300 and EW 500 G4 components, protecting your investment across system upgrades.

Key Features

• 1,680 Selectable UHF Frequencies — Wide frequency agility for interference-free operation in crowded RF environments and multi-channel setups.
• HDX Compander — Sennheiser's high-performance compander minimizes noise and maximizes dynamic range for transparent wireless audio.
• Locking 3.5mm Input Connector — Secure connection for Sennheiser-compatible lavalier, headset, or instrument adapter cables.
• Adjustable Input Level — Fine-tune sensitivity to match any mic or instrument source for optimal gain staging.
• Up to 8 Hours Battery Life — Two AA batteries power a full day of continuous use for live events and multi-session shoots.
• Rechargeable Battery Option — Compatible with the optional BA 2015 Accupack, rechargeable in-place via the optional L 2015 charging unit.
• Backlit LCD Display — Shows frequency, group, channel, battery status, and transmit power at a glance.
• Infrared Sync — Instantly links transmitter and EM 100 G4 receiver to the same frequency via IR beam.
• Programmable Mute with Lockout — Talent can mute between takes; lockout prevents accidental activation during live performance.
• Fixed 30 mW RF Output — Consistent transmission power for reliable range in typical stage and production environments.
• Backward-Compatible — Works with Evolution Wireless G1, G2, G3 receivers and select EW 300/500 G4 components.
• Rugged All-Metal Housing — Durable and comfortable for extended daily wear on stage, in the classroom, or on set.

Typical Applications

• Live stage performance with lavalier or headset microphones
• Broadcast and ENG talent microphone systems
• Corporate presentations, conferences, and lecture capture
• Theatre and musical theatre productions
• Houses of worship with active performers or speakers
• Film and video production with on-camera or boom-independent talent mics
• Fitness instructors and touring presenters

Technical Specifications

Frequently Asked Questions

Q: Does the SK 100 G4 come with a microphone?

No. The SK 100 G4 is a bodypack transmitter sold separately from any microphone. It is designed to be paired with Sennheiser-compatible lavalier or headset microphones, or an instrument cable adapter, depending on the application.

Q: Which receiver does the SK 100 G4 work with?

The SK 100 G4 is designed to pair with the Sennheiser EM 100 G4 receiver. It is also backward-compatible with Evolution Wireless G1, G2, and G3 receivers, and is interoperable with select EW 300 and EW 500 G4 components.

Q: What do the frequency band variants (A, A1, G) mean?

Each variant covers a different UHF frequency range tuned for specific regional RF environments. The A, A1, and G bands correspond to different MHz ranges. Check with your local regulations or RF coordinator to confirm which band is legal and optimal for your region.

Q: How do I sync the SK 100 G4 to its receiver?

Point the front of the transmitter at the infrared sensor on the EM 100 G4 receiver and activate the Sync function on the receiver. The two units will automatically link to the same frequency and group settings in seconds.

Q: Can I use rechargeable batteries in the SK 100 G4?

Yes. In addition to standard AA batteries, the SK 100 G4 is compatible with the optional Sennheiser BA 2015 Accupack rechargeable battery, which can be charged in-place using the optional L 2015 quick-charging unit without removing it from the transmitter.

Q: What is the HDX compander?

HDX is Sennheiser's high-performance compander system used in the Evolution Wireless G4 platform. It compresses the audio signal before transmission and expands it on the receiver end, resulting in low noise, wide dynamic range, and transparent-sounding wireless audio.

Q: How far can the SK 100 G4 transmit?

The SK 100 G4 has a fixed 30 mW RF output with a transmission range of up to 330 feet (approximately 100 meters) in line-of-sight conditions. Actual range will vary based on RF environment, antenna placement, and obstructions.

Q: Can the mute function be locked to prevent accidental activation?

Yes. The mute switch on the SK 100 G4 can be locked out via the menu, preventing performers or talent from accidentally muting themselves during a live performance or recording session.