Saramonic K9 TX

The Saramonic K9 TX is a digital UHF bodypack transmitter of the K9 system for film and TV production. Connect a lavalier microphone or line source to its locking 3.5 mm input; the transmitter sends audio in the 550–960 MHz band while recording a 32-bit float backup to a microSD card of up to 256 GB and receiving LTC timecode. It runs on two AA batteries or via USB-C.

Saramonic K9 TX

Digital UHF bodypack transmitter with its own 32-bit float recording, timecode and a locking 3.5 mm input for mic and line.

550–960 MHz32-bit floatmicroSD up to 256 GBLTC timecode85 g

32-bit float recording in the transmitter

The K9 TX transmitter records a backup as WAV, 24-bit or 32-bit float at 48 kHz, to a microSD card of up to 256 GB. A clipped or overly quiet passage can then be fixed in post. Recording starts manually, automatically at power-on, or after timecode sync.

Timecode in the transmitter

The K9 TX transmitter receives SMPTE LTC timecode (23.98 to 30 fps) over a 3.5 mm cable via the mic input or USB-C, wirelessly from the Saramonic TC-NEO generator, or from the Saramonic System app. Clock accuracy is 0.15 ppm, i.e. one frame in 48 hours. The K9 TX receives timecode; it does not generate master timecode itself.

Saramonic System app

Over Bluetooth you control up to 48 devices from your phone: groups, gain, frequencies, transmitter sleep mode to save battery and batch firmware updates. At first power-on the K9 is activated in the app, which assigns the frequency band permitted in your country based on the phone location.

AA batteries or USB-C

The transmitter runs up to 9 hours on two lithium iron AA batteries, the receiver up to 8 hours. Alkaline, NiMH or 3.7 V lithium cells can also be used, and the devices can be powered via USB-C even while recording. Batteries are swapped in seconds.

Digital UHF 550–960 MHz

The K9 system transmits audio digitally in the wide 550–960 MHz UHF band, which resists Wi-Fi and Bluetooth interference better than 2.4 GHz and passes through obstacles more easily. Frequencies are updated via GPS, auto scanning on the receiver finds the cleanest channel, and the band is assigned according to local regulations.

130 dB dynamic range

The transmitter input has a dynamic range of 130 dB, the receiver analogue output 120 dB. Digital transmission keeps the audio uncompressed, capturing everything from a shout to a whisper without loss of quality. Frequency response is 20 Hz – 20 kHz and latency 6.3 ms.

Input for mic and line

The locking 3.5 mm TRS input with Sennheiser-compatible wiring powers the microphone at 3 or 5 V, or works as a line input. Gain is set from 0 to +30 dB in 1 dB steps and the low-cut filter offers 75, 100 and 150 Hz.

IFB monitoring for the director

The transmitter is switched to line input and connected to the recorder output; the receiver in monitor mode then sends the sound mix to the director’s headphones. The director hears the actors in real time without waiting for playback; monitor volume has 12 levels.

For film and TV crews

K9 is a digital UHF wireless system built for professional filmmakers: the receiver on the camera or in the sound bag, the transmitters on the actors. Two channels cover an interview, a documentary or a scripted scene.

Transmitter runtime by battery type

The transmitter lasts longest on 1.5 V lithium iron cells, 9 hours; about 6.9 hours on 3.7 V lithium cells and 6.1 hours on NiMH Eneloop. The values were measured in the Saramonic acoustic lab under standard conditions.

Compatibility and firmware

The K9 TX and K9 XTX transmitters send to the K9 RX receiver. For a reliable connection they need firmware K9 XTX V2.64 or later, K9 TX V2.65 or later and K9 RX V2.60 or later; updates are done in the Saramonic System app.

Additional information

The Saramonic K9 TX is a high-performance bodypack UHF transmitter with built-in 32-bit float recording, timecode sync, and wide frequency coverage — designed for professional filmmakers and content creators.

Th e Saramonic K9 TX bodypack transmitter operates on an ultra-wide 550–960 MHz UHF band, giving you global frequency coverage with excellent resistance to interference. It supports selectable RF power levels (10 / 25 / 50 / 100 mW) so you can adapt to different output needs. Its input dynamic range is 130 dB, providing outstanding audio fidelity even in very quiet or very loud scenarios. For redundancy and safety, the TX packs 32-bit float onboard recording to a microSD card (supports up to 256 GB), ensuring you capture pristine, unclipped audio and always have a backup. It also supports timecode sync: LTC (SMPTE) timecode input via 3.5 mm for wired sync, or sync wirelessly within the Saramonic System. On the mic side, the TX has a locking 3.5 mm TRS mic input that supports mic- or line-level sources, with selectable mic power (3 V, 5 V) and up to +30 dB gain. There’s also a low-cut filter (off / 75 / 100 / 150 Hz) to help clean up rumble or handling noise. 

Power is supplied via external batteries: it runs on 2 × AA (can use lithium iron, alkaline, or rechargeable types), giving up to ~9 hours of use. The TX is compact and lightweight, measuring 80 × 62 × 19 mm, and weighing 85 g (without battery / antenna).Finally, through the Saramonic System app, you can manage settings, monitor status, and even sync up to 48 devices — ideal for complex multi-mic setups. 

Key Features:

• Ultra-wide 550–960 MHz UHF transmission for global coverage 
• Selectable RF power: 10 / 25 / 50 / 100 mW 
• 130 dB input dynamic range 
• 32-bit float onboard recording to microSD (up to 256 GB) 
• Timecode sync (LTC via 3.5 mm or wireless via Saramonic) 
• Mic / line-level input: 3.5 mm TRS, 3 V / 5 V mic power, 0-30 dB gain 
• Low-cut filter: OFF / 75 / 100 / 150 Hz 
• Sample rate: 48 kHz / 24-bit (recording) 
• Battery life up to ~9 hours (with 2 AA) 
• Compact size (80 × 62 × 19 mm), lightweight (85 g without battery) 
• Operating temperature: –20°C to +45°C 
• Control and monitoring via Saramonic System app (up to 48 units)