Sennheiser 509163 – Spectera SEK Bodypack 1G4

Product Overview

The Sennheiser 509163 Spectera SEK is a bidirectional bodypack for the 1G4 band (1350–1400 MHz and 1435–1525 MHz) that handles both in-ear monitor reception and microphone/line transmission in a single unit. Each Spectera SEK bodypack manages an IEM/IFB stream and a mic/line stream simultaneously, replacing the separate transmitter and receiver packs of conventional wireless systems. As a bidirectional 1G4 bodypack, it is built for broadcast, theater, and live performance where talent needs both wireless mic and personal monitoring. It operates as part of the Sennheiser Spectera digital wireless ecosystem and requires the BA 70 rechargeable battery, sold separately.

Product Description

The Spectera SEK is the on-body transceiver of Sennheiser's Spectera bidirectional wideband wireless platform. Operating in the 1G4 range, it simultaneously transmits a microphone or line signal back to the Spectera Base Station while receiving an in-ear monitor or IFB feed, all over a single bidirectional RF link.

The bodypack delivers an audio frequency response of 20 Hz to 20,000 Hz (plus/minus 1 dB) at a 96 kHz / 24-bit sample rate, and secures its link with AES 256 CTR Mode encryption. RF transmission power is up to 50 mW, limited by country regulation. It connects to a wide range of Sennheiser lavalier and headset microphones via a 3-pin locking connector, and to in-ear monitors through a 3.5 mm connector, so it drops into existing microphone and IEM inventories. A persistent always-on display, status LED, and LED meter keep operators informed of level and status even when the pack is idle. The unit measures approximately 83.5 x 62 x 21 mm (without antenna), keeping it compact for body-worn use. Powered by the rechargeable lithium-ion BA 70 battery (sold separately), it delivers up to 7 hours of operation depending on the selected audio link mode and settings. For deployments, the SEK pairs with a licensed Spectera Base Station and the appropriate DAD antennas. A UHF variant is also available for installations operating in the 470–698 MHz range.

Key Features

• Bidirectional Operation — Each bodypack simultaneously transmits a mic/line signal and receives an IEM/IFB stream over one RF link.
• 1G4 Frequency Range — The pack operates in the 1G4 band, covering 1350–1400 MHz and 1435–1525 MHz.
• High-Resolution Audio — It delivers a 20 Hz to 20,000 Hz response (plus/minus 1 dB) at a 96 kHz / 24-bit sample rate.
• AES 256 Encryption — AES 256 CTR Mode encryption secures the bidirectional wireless link.
• Flexible Connectivity — A 3-pin locking connector accepts Sennheiser lavalier and headset mics, while a 3.5 mm output drives in-ear monitors.
• Always-On Display — A persistent display, status LED, and LED meter keep level and status information visible at a glance.
• Up to 50 mW RF Power — The pack transmits at up to 50 mW, limited according to country regulations.
• Up to 7 Hours Runtime — The rechargeable BA 70 lithium-ion battery (sold separately) provides up to 7 hours depending on link mode and settings.

Typical Applications

• Broadcast studio
• Auditorium
• House of worship
• All-hands room
• Training room
• Multi-purpose room

Technical Specifications

Frequently Asked Questions

What does bidirectional mean on the Spectera SEK?

The bodypack transmits a microphone or line signal to the base station while simultaneously receiving an in-ear monitor or IFB feed, handling both directions over a single RF link.

What battery does the SEK use?

It uses the rechargeable lithium-ion BA 70 battery, which is sold separately, and delivers up to 7 hours of operation depending on the link mode and settings.

What microphones and monitors are compatible?

The pack accepts a wide range of Sennheiser lavalier and headset microphones via a 3-pin locking connector, and connects to in-ear monitors through a 3.5 mm output.

What is the audio quality?

The SEK provides a 20 Hz to 20,000 Hz frequency response (plus/minus 1 dB) at a 96 kHz / 24-bit sample rate.

How is the wireless link secured?

The link uses AES 256 CTR Mode encryption to protect the audio signal.

What else do I need to run the SEK?

The SEK operates within the Spectera ecosystem and requires a licensed Spectera Base Station and the appropriate DAD antennas, plus a BA 70 battery for the pack itself.

Is there a version for UHF frequencies?

Yes. Sennheiser offers a UHF variant of the Spectera SEK for installations operating in the 470–698 MHz range; this model is the 1G4 version.

Where can I get integration support?

Our team can assist with Spectera system design, frequency coordination, and microphone selection. Contact us through creationnetworks.net.