Sennheiser EW 100 G4-845-S-G Rugged all-in-one wireless system

Product Overview

The Sennheiser EW 100 G4-845-S-G is a professional all-in-one wireless handheld system designed for performers and presenters who need tighter pickup control and superior feedback rejection in loud stage environments. It combines the MMD 845-1 dynamic super-cardioid capsule — drawn from the acclaimed Sennheiser e 845 — with the EM 100 G4 half-rack receiver, all tuned to the G-band (566–608 MHz). The super-cardioid polar pattern focuses on the source directly in front of the capsule and rejects off-axis energy at a narrower angle than a standard cardioid, making the 845-S the preferred choice when loud floor monitors, high stage volume, or problematic room acoustics threaten feedback. Built on the proven fourth-generation EW 100 platform, the system delivers 1,680 switchable frequencies, true diversity reception, and Sennheiser's HDX compander for transparent live audio.

Product Description

The SKM 100 G4-S handheld transmitter at the core of this system houses the MMD 845-1 super-cardioid capsule in a lightweight, full-aluminum body with an integrated mute switch. The super-cardioid pattern provides a more focused pickup angle compared to a cardioid, capturing the singer's or speaker's voice with precision while rejecting more sound from monitors and side-stage sources. This tighter pattern translates directly into higher gain-before-feedback — you can push the PA harder before the system rings out, which is a meaningful advantage on loud stages and in acoustically challenging rooms.

The EM 100 G4 receiver offers true antenna diversity in a rugged, half-rack metal enclosure. Its backlit LCD panel displays RF signal strength, audio level, battery charge, and operating frequency simultaneously, giving front-of-house engineers instant situational awareness. Infrared synchronization makes frequency cloning from receiver to transmitter fast and error-free — simply align the IR windows and press sync. The linking system allows one receiver to cascade frequency assignments to up to 12 units via the RJ10 cable, streamlining multi-channel setups considerably.

Operating on G-band (566–608 MHz), this system is frequency-coordinated for use where G-band spectrum is available and clear. With up to 42 MHz of tunable bandwidth, 1,680 selectable frequencies, and support for up to 20 simultaneous compatible channels, the platform scales from single-channel installations to full multi-wireless events. RF output power reaches up to 30 mW (region-dependent), providing a transmission range of up to 100 meters (300 feet). The SKM 100 G4-S runs on two AA batteries for up to 8 hours of continuous operation, and the complete kit ships with receiver, rack kit, RJ10 cable, and mic clip ready to deploy.

Key Features

• MMD 845-1 Dynamic Super-Cardioid Capsule — Tighter polar pattern than a standard cardioid delivers superior feedback rejection and focused pickup for loud stage environments.
• G-Band Operation (566–608 MHz) — Clean UHF spectrum in the G-band range with 42 MHz of bandwidth and 1,680 switchable frequencies for interference-free performance.
• True Diversity Reception — Dual-antenna diversity in the EM 100 G4 receiver continuously selects the stronger RF signal, eliminating dropout artifacts.
• HDX Compander Technology — Sennheiser's proprietary compander achieves high dynamic range and low noise for transparent, professional-grade wireless audio.
• Higher Gain-Before-Feedback — Super-cardioid pattern rejects off-axis monitor energy, allowing more headroom on the PA before feedback onset.
• Infrared Sync — One-touch IR frequency cloning from receiver to transmitter eliminates manual programming and speeds up multi-channel setups.
• Up to 20 Compatible Channels — Run up to 20 EW 100 G4 systems simultaneously without mutual interference.
• Multi-Channel Linking — Cascade frequency assignments to up to 12 receivers via RJ10 cable for fast, coordinated multi-channel deployment.
• Integrated Mute Switch — On-transmitter mute for discreet silencing between segments without rack intervention.
• Up to 8 Hours Battery Life — Two AA batteries provide a full day of wireless operation from a single set.
• Full-Metal Receiver Housing — Road-ready EM 100 G4 enclosure with backlit LCD displaying RF level, audio level, battery, and frequency.
• Complete Kit — Ships with SKM 100 G4-S transmitter, EM 100 G4 receiver, rack kit, RJ10 cable, and mic clip.

Typical Applications

• Lead vocals in loud stage environments where monitor bleed and feedback are primary concerns
• High-energy live performances — rock, gospel, and high-SPL genres
• Houses of worship with loud band accompaniment and monitor-heavy stage setups
• Theatrical productions requiring precise pickup rejection of off-stage sound
• Corporate AV and conference rooms with reflective acoustics
• Multi-channel live events and festivals with up to 20 simultaneous wireless channels
• Broadcast and ENG applications requiring a rugged, reliable handheld wireless system

Technical Specifications

Frequently Asked Questions

Q: What makes the 845-S super-cardioid capsule different from the 835-S and 935-S cardioid capsules?

The 845-S uses a super-cardioid polar pattern — a narrower pickup angle than the cardioid pattern in the 835-S and 935-S. This tighter pattern picks up less sound from the sides and rejects more monitor energy from floor wedges directly in front of the capsule, giving you more gain-before-feedback. Choose the 845-S when stage volume is high or feedback is a consistent challenge. The 835-S and 935-S cardioid capsules offer a wider, more forgiving pickup pattern better suited to handheld performances where mic technique may vary, or where a broader, more natural sound character is preferred.

Q: Is the EW 100 G4-845-S-G locked to G-band, or can it be retuned to other bands?

This product is factory-tuned to G-band (566–608 MHz). The transmitter and receiver can be tuned anywhere within the 42 MHz G-band window, but cannot switch to A-band or A1-band. If you need multi-band flexibility, different band variants of the EW 100 G4-845-S are available.

Q: How many systems can I run simultaneously?

Up to 20 compatible EW 100 G4 channels can operate simultaneously in the same RF environment, making this system scalable for mid-to-large multi-channel live event productions.

Q: Can I use this system outdoors?

Yes. The rugged metal construction of both the transmitter and receiver is designed for professional live use, including outdoor festival stages and corporate outdoor events. Ensure local regulations permit G-band (566–608 MHz) operation at your outdoor venue.

Q: What batteries does the SKM 100 G4-S transmitter use?

Two standard AA batteries (alkaline or NiMH rechargeable) power the transmitter for up to 8 hours of continuous use. Battery level is displayed on the EM 100 G4 receiver's LCD screen in real time.

Q: Can I swap the MMD 845-1 capsule for a different one?

Yes. The SKM 100 G4-S transmitter accepts all Sennheiser MMD capsule modules, including cardioid, super-cardioid, and condenser options, allowing you to adapt the system to different applications without replacing the transmitter body.

Q: Does the EM 100 G4 support rack mounting?

Yes. The EM 100 G4 is a half-rack unit and ships with a rack-mount kit that fits two units side-by-side in a single rack unit (1U), making it ideal for touring racks and installed AV systems.

Q: What does HDX compander mean and why does it matter?

HDX is Sennheiser's proprietary compander (compressor-expander) system used to encode and decode the audio signal over the wireless link. It achieves a higher dynamic range and lower noise floor than earlier compander designs, resulting in cleaner, more transparent wireless audio — especially noticeable on quiet passages and detailed vocal performances.