Sennheiser 509621

Overview

The Sennheiser 509621 is a stereo bodypack receiver designed for professional in-ear monitoring, paired with IE 4 earphones to deliver clear and reliable sound on stage. Operating within a frequency range of 470 to 516 MHz, it offers up to 1680 tunable frequencies across 16 channels, providing ample options to secure a clean wireless signal in busy environments. This combination is well suited for musicians, sound engineers, and performers who require consistent audio quality during live performances or rehearsals.

Equipped with adaptive diversity technology, the receiver maintains a stable connection by minimizing dropouts and interference. Its compact metal housing is built to endure the demands of touring and daily use, while weighing just 125 grams with batteries installed. The unit supports power from two AA batteries or a rechargeable accupack, offering flexibility for different setups. The included IE 4 earphones connect via a 3.5mm stereo jack and deliver detailed sound with effective isolation.

Key features

• Adaptive diversity technology ensures a stable and interference-resistant wireless connection.
• Infrared wireless synchronization simplifies setup with compatible transmitters.
• Backlit display provides clear information on RF levels, battery status, and channel settings.
• Switchable high-boost and adjustable limiter allow precise control over audio output for optimal listening.
• Durable metal housing designed to withstand the rigors of professional use and touring.
• Lightweight design at 125 grams including batteries, making it comfortable for extended wear.
• Transmission range up to 100 meters enables freedom of movement on stage without signal loss.
• Integration with Sennheiser’s WSM software facilitates frequency management in complex environments.
• IE 4 earphones provide detailed sound reproduction and good isolation for focused monitoring.

Key specs

• Frequency range: 470 to 516 MHz
• Tunable frequencies: up to 1680
• Channels: 16 compatible channels
• Transmission range: up to 100 meters
• Weight: 125 grams including batteries
• Power supply: two AA batteries or rechargeable accupack
• Audio output: 3.5mm stereo jack

Connectivity and compatibility

The receiver connects to the included IE 4 earphones via a standard 3.5mm stereo jack, ensuring compatibility with a wide range of in-ear monitors. Infrared wireless synchronization allows quick pairing with compatible Sennheiser transmitters, streamlining setup in live or rehearsal environments. The unit’s frequency range and multiple tunable channels make it adaptable to various wireless systems, reducing interference and improving reliability.

Ideal uses and environments

This bodypack receiver and earphone set is a strong choice for live performers, sound engineers, and musicians who need dependable in-ear monitoring with clear audio and stable wireless performance. It fits well in concert venues, theaters, and rehearsal spaces where multiple wireless systems operate simultaneously. The durable build and flexible power options make it suitable for touring professionals and studio use alike, providing consistent sound quality and freedom of movement on stage.

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