Sennheiser SPECTERA SEK (1G4)

Sennheiser Spectera SEK (1G4) Bidirectional Wireless Bodypack

The Sennheiser Spectera SEK (1G4) (Article Number: 509163) is a bidirectional wireless bodypack that fundamentally reshapes live performance workflows. Utilizing revolutionary WMAS (Wireless Multichannel Audio Technology), this single piece of hardware functions simultaneously as a digital microphone/instrument transmitter and a high-performance in-ear monitor (IEM/IFB) receiver.

Operating in the 1G4 frequency band (1350 - 1400 MHz and 1435 - 1525 MHz), the SEK allows a performer to transmit pristine vocal or instrument data up to the Base Station while simultaneously receiving a stereo monitor mix back through the same single RF carrier block. This replaces the traditional requirement of separating talent into independent transmitter and receiver bodypacks.

Key Architectural and WMAS Ecosystem Attributes

• Simultaneous Bi-Directional Streaming: The bodypack manages a digital mic/line input stream and a return stereo or mono monitor mix on a single wideband carrier. This saves physical space on the artist's costume and streamlines overall inventory footprint.

• Full-Spectrum Telemetry Remote Control: Sound engineers gain full remote command over the bodypack via Sennheiser’s LinkDesk software or the Spectera WebUI. Without touching the hardware on the artist, technicians can remotely alter mic pre-amp gain, tweak local IEM headphone output volume, verify real-time battery cell telemetry, and track RF fading characteristics on the fly.

• Persistent E-Ink Status Matrix: The face of the bodypack features an advanced, ultra-low-consumption E-Ink display window. It displays critical allocation data, including user name tags and local network profiles. Because it is persistent, the text remains fully visible on screen even when the batteries are completely pulled out, making asset tracking effortless in dim backstage environments.

• High-Current Audio Drive Circuit: Built into the 3.5mm monitor output port is an impedance-matching, high-power headphone amplifier. This matches the unique impedance curves of high-end custom multi-driver in-ear monitors, delivering punchy bass transient accuracy and extreme clarity.

• Robust Interference and Fade Defiance: Standard narrowband signals are highly susceptible to dropouts from physical multipath fading. Because WMAS spreads data across a wide multi-carrier multiplexing layout, the SEK (1G4) achieves dropout resistance comparable to up to a 40x diversity antenna system.

Technical Specifications Matrix

Battery Runtime Configurations (BA 70 Cell)

System Deployment and Hardware Interfacing Advice

Mind the Cable Strain and Placement: The SEK bodypack utilizes a professional 3-pin LEMO socket for microphone and instrument inputs, alongside a standard 3.5 mm socket for the headphone loop. Always ensure the 3-pin LEMO input cable clicks fully into place. When anchoring the bodypack to an artist's belt, route both the microphone line and headphone line with a subtle slack loop to absorb sudden physical movements and prevent microphonic handling noise from traveling up the cable jacket.

Utilize Smart Link Modes for Latency Planning: The Spectera platform provides 11 selectable Audio Link Modes within the control software, giving you precise command over audio performance parameters. For lead vocalists who need instant timing accuracy, assign their link profile to the Live Ultra Low Latency Stereo or Live Low Latency Mono profiles to lock the operational system latency down to a near-imperceptible 0.7 ms to 1.0 ms window.