IEM feedback kit (2x EK + IE4), GA3, 516 - 558 MHz, generation 4

Engineered for professional live sound: Rugged all-in-one wireless monitoring system for in-ear applications. Full control over your performance – your direct link, everywhere, everyday. The G4 In-Ear Monitoring Sets make your gig an extraordinary experience – not just for your audience, but also for you. Robust bodypack receiver and reliable in-ear monitoring IE 4 headphones delivering clarity along the whole frequency spectrum for daily use on stage.

Sennheiser ew IEM G4-Twin-A Wireless In-Ear Monitoring System

The Sennheiser ew IEM G4-Twin-A is a professional-grade wireless in-ear monitoring (IEM) system engineered for live stage, theater, and house-of-worship applications.[1] This rugged, all-in-one monitoring solution delivers crystal-clear audio directly to performers' ears, enabling silent stage performances and seamless communication between band members.[6] The system provides interference-free wireless monitoring with exceptional audio quality and reliability, making it an ideal choice for touring musicians, theater productions, and professional audio environments.

The system operates within the A-band frequency range of 516–558 MHz, providing up to 1,680 selectable frequencies tunable in 25 kHz steps across a 42 MHz bandwidth.[1][2] This extensive frequency selection ensures clear audio transmission without interference or dropouts, even in complex RF environments. The system supports up to 16 compatible channels, allowing for flexible expansion and configuration for larger monitoring setups.[1][2] Frequency management is streamlined through automatic frequency scanning and the optional WSM (Wireless Systems Manager) control software accessible via an Ethernet interface for networked frequency allocation.[2]

The core package includes the following components:[2][5]

• One SR IEM G4 stereo transmitter (9.5" rackmountable unit)
• Two EK IEM G4 stereo bodypack receivers
• Two pairs of IE4 earphones
• One GA3 rackmount kit
• Power supply and rod antenna
• Four AA batteries for receiver operation

The SR IEM G4 transmitter is a half-rack stereo unit housed in rugged metal construction with dimensions of approximately 202 x 212 x 43 mm and a weight of 980 grams.[4] It features a menu-driven backlit OLED display providing real-time monitoring of current frequency, frequency bank, channel number, AF level metering, transmission status, equalizer settings, lock status, and input sensitivity.[1] The transmitter includes an auto-lock feature to prevent accidental settings alteration and operates with a 12V DC power supply consuming a maximum of 350 mA.[4] Connectivity features include two electronically balanced XLR-1/4" combo input sockets, a 1/4" headphone output with volume control, an Ethernet port (RJ45) for remote network-based monitoring, and a 50-ohm BNC-type antenna input.[1]

Synchronization between the transmitter and receivers is achieved through an integrated infrared interface that enables rapid, flexible wireless synchronization without the need for physical connections.[1][2] This upgraded infrared technology allows for fast frequency updates and receiver configuration management. The transmitter supports switchable transmission power of 10, 30, or 50 mW depending on country regulations, with typical RF output power up to 30 mW in standard operation.[3] The modulation scheme employs wideband FM stereo with MPX pilot tone, ensuring high-fidelity audio reproduction across the system's frequency response range of 25 Hz to 15 kHz.[2][6]

Each EK IEM G4 bodypack receiver is housed in rugged metal construction and operates on two 1.5V AA-sized batteries or an optional Sennheiser BA 2015 rechargeable battery pack, providing up to eight hours of battery life depending on volume levels.[1][6] The receivers feature a switchable high-boost equalizer with +8 dB at 8 kHz and a multi-level adjustable limiter ranging from –18 dB to –6 dB in 6 dB increments, which can be bypassed entirely to prevent distortion and protect hearing.[1][2][4] The system delivers over 90 dB signal-to-noise ratio for exceptionally clean signal quality and features up to 25 dB of squelch capability to reduce ambient noise.[6] Earphone output utilizes a standard 3.5mm stereo jack socket compatible with the included IE4 earphones or third-party in-ear monitors.[1]

The ew IEM G4-Twin-A system achieves exceptional transmission range of up to 300 feet, enabling reliable coverage across large venues and performance spaces.[3] The system operates across a temperature range of –10°C to +55°C (+14°F to +131°F), ensuring reliable performance in diverse environmental conditions.[4] Additional features include 20 channel banks with up to 16 presets each, automatic frequency scanning to identify open channels, HDX compander technology for enhanced audio quality, and a 4-digit battery indicator on both transmitter and receiver for easy battery management.[2] The complete system is designed for professional live sound applications requiring robust, interference-free wireless monitoring with exceptional audio fidelity and operational flexibility.