Sennheiser 509501 Pro Audio Bodypack Transmitter — main product image

Sennheiser 509501 Pro Audio Bodypack Transmitter

Sennheiser

Sennheiser 509501 Pro Audio Bodypack Transmitter

Name: Sennheiser 509501 Pro Audio Bodypack Transmitter
Brand: Sennheiser
SKU: 509501

★★★★★4.5 (63 reviews)

Professional UHF bodypack transmitter with rugged metal build and reliable wireless audio for presenters and performers.

$296.10*

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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Sennheiser SK 100 G4-A is a professional-grade UHF bodypack transmitter built for reliable wireless audio in demanding environments. Constructed with a rugged metal housing, it is designed to endure the rigors of live performance, broadcast, and corporate presentation use. The transmitter operates within the A frequency band (516–558 MHz) and pairs with Sennheiser's ew 100 G4 series receivers, offering a proven wireless ecosystem with robust RF performance and clear audio transmission.

Setup is straightforward thanks to an easy-to-navigate display and intuitive controls that allow quick frequency selection and sync with compatible receivers. The 1/8-inch ew locking connector ensures a secure, rattle-free connection with Sennheiser lavalier and headset microphones, as well as third-party options that use the same connector. The compact form factor clips unobtrusively to a belt or waistband, making it suitable for on-camera talent, theater performers, and public speakers. Powered by two AA batteries, it delivers extended runtime for full-length events. As part of the broader ew 100 G4 system, the SK 100 G4-A can be expanded alongside other transmitters and receivers to build multi-channel wireless setups for more complex productions.

Key Features

Body pack transmitter with 1/8" audio input socket (ew connector), frequency range: A (516 - 558 MHz)

The Package heigt of the product is 3.19 inches

The Package Length of the product is 13.78 inches

The Package Width of the product is 2.87 inches

Specifications

Frequency Range

A band (516–558 MHz)

Audio Input

1/8" (3.5mm) locking ew connector

Construction

Metal housing

Power Source

2 x AA batteries

Compatible Receivers

Sennheiser ew 100 G4 series

Model Number

509501

Pros & Cons

👍 Pros

Durable metal housing withstands the demands of live performance and touring
Operates across the 516–558 MHz A band with reliable, interference-resistant UHF transmission
Compatible with the full Sennheiser ew 100 G4 receiver ecosystem for flexible system building
Compact, lightweight body clips discreetly to a belt or waistband
Easy-to-read display and straightforward controls simplify frequency setup on the fly

👎 Cons

Only compatible with the A frequency band (516–558 MHz), which may not be available in all regions
Requires a matching Sennheiser ew 100 G4 series receiver, sold separately
Uses the proprietary Sennheiser ew 3.5mm locking connector rather than a standard 3.5mm jack
No included microphone or cable — lavalier or headset must be purchased separately
Runs on disposable AA batteries with no built-in rechargeable option

Frequently Asked Questions

What type of microphone connector does the SK 100 G4 use?

The SK 100 G4 uses Sennheiser's 1/8-inch (3.5mm) locking ew connector, which is compatible with Sennheiser ME-series lavalier and headset microphones as well as third-party mics with the ew connector.

Which receivers is this transmitter compatible with?

The SK 100 G4-A is designed to work with Sennheiser ew 100 G4 series receivers, including the EK 100 G4 portable receiver and EM 100 G4 rackmount receiver, within the matching A frequency band.

What is the frequency range and why does it matter?

This unit operates in the A band (516–558 MHz). You need to ensure this frequency range is legal and available for use in your country or region, and that your receiver matches the same frequency band.

What powers the transmitter and how long does the battery last?

The SK 100 G4 runs on two AA batteries (not AAA) and provides up to 8 hours of operation, depending on the transmission power setting and battery type.

Can I use this bodypack as a guitar or instrument transmitter?

Yes. With a compatible Sennheiser CI 1 instrument cable (sold separately), the SK 100 G4 can transmit audio from guitars, basses, and other instruments with a 1/4-inch output.