Sennheiser SR IEM G4-A1 | Stereo IEM Transmitter 470-516 MHz | 42MHz Bandwidth with 50mW RF

Stereo In-Ear Monitor Transmitter

Sennheiser SR IEM G4-A1 is a professional half-rack stereo in-ear monitor (IEM) transmitter designed for live stage, theater, and rehearsal applications. Operating in the A1 frequency band (470–516 MHz), it provides wideband FM stereo modulation, reliable RF performance, and flexible frequency management for demanding wireless monitoring environments.

Sennheiser SR IEM G4-A1 Competitive Differences

• Up to 42 MHz switching bandwidth with 1680 selectable UHF frequencies
• Infrared synchronization and up to 50mW switchable RF output power

Sennheiser SR IEM G4-A1 Description

The Sennheiser SR IEM G4-A1 is part of Sennheiser’s evolution wireless G4 series, offering professional-grade in-ear monitoring with stable UHF transmission. With 1680 tunable frequencies in 25 kHz steps and up to 42 MHz bandwidth, it ensures flexible coordination in crowded RF environments.

The transmitter provides 20 fixed frequency banks with up to 16 compatible presets each, plus 6 user banks with up to 16 programmable channels. Wideband FM stereo modulation with Sennheiser HDX companding delivers clear, dynamic audio with a frequency response of 25 Hz to 15 kHz and a signal-to-noise ratio greater than 90 dB.

Built in a rugged full-metal housing, the SR IEM G4-A1 features a backlit OLED display for easy menu-driven control and monitoring of frequency, bank, AF level, transmission status, EQ settings, and lock status. Associated receivers can be synchronized quickly via integrated infrared technology. Connectivity includes dual balanced XLR/1/4" combo inputs, balanced loop outputs, a 1/4" headphone output with volume control, Ethernet (RJ-45) for network-based monitoring, and a 50 Ohm BNC antenna output. RF output power is switchable between 10 mW, 30 mW, and 50 mW depending on local regulations, offering a transmission range of up to 300 feet (100 meters).

SR IEM G4-A1 Features

• Half-rack stereo IEM transmitter with full-metal housing
• Frequency range: 470 – 516 MHz (A1 band)
• Up to 42 MHz switching bandwidth
• 1680 selectable frequencies in 25 kHz steps
• 20 preset banks with up to 16 compatible channels each
• 6 user-programmable banks with up to 16 channels each
• Wideband FM stereo modulation with HDX compander
• Infrared synchronization between transmitter and receiver
• Switchable RF output power: 10 mW / 30 mW / 50 mW
• Transmission range up to 300 ft (100 m)
• OLED display with menu-driven interface and auto-lock
• Dual balanced XLR/1/4" combo inputs
• Ethernet port (RJ-45) for network monitoring

SR IEM G4-A1 Specifications

• Modulation: Wideband FM stereo (MPX pilot tone)
• Frequency Band: A1 (470 – 516 MHz)
• Switching Bandwidth: Up to 42 MHz
• Selectable Frequencies: 1680
• RF Output Power (Switchable): 10 mW / 30 mW / 50 mW
• AF Frequency Response: 25 Hz – 15 kHz
• Maximum Input Level: +22 dBu
• Total Harmonic Distortion: ≤ 0.9%
• Signal-to-Noise Ratio: > 90 dB
• Antenna Output: BNC, 50 Ohms
• Power Supply: 12 VDC
• Current Consumption: Max 350 mA
• Dimensions: 8.0 x 8.3 x 1.7 in (202 x 212 x 43 mm)
• Weight: 2.2 lb (980 g)

What's In The Box

• SR IEM G4-A1 Stereo Transmitter
• GA 3 Rackmount Kit
• 12 V Power Supply