SKU: 32106537152

Sennheiser SK 9000 A1-A4 Bodypack transmitter, digital, HD and LR mode, 3-pin SE socket, 470-558 MHz

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Description

Sennheiser SK 9000 A1-A4 Bodypack transmitter, digital, HD and LR mode, 3-pin SE socket, 470-558 MHzSennheiser SK 9000 A1 A4 Digital Wireless Bodypack Transmitter The Sennheiser SK 9000 A1 A4 (Article Number: 504730) is the cornerstone pocket transmitter of Sennheisers elite Digital 9000 wireless platform. Built into a highly durable magnesium alloy casing, this reference grade bodypack is designed for premier broadcast studios, international music tours, and complex theatrical productions that demand zero compromises in audio quality or RF

Sennheiser SK 9000 A1-A4 Digital Wireless Bodypack Transmitter

The Sennheiser SK 9000 A1-A4 (Article Number: 504730) is the cornerstone pocket transmitter of Sennheiser’s elite Digital 9000 wireless platform. Built into a highly durable magnesium-alloy casing, this reference-grade bodypack is designed for premier broadcast studios, international music tours, and complex theatrical productions that demand zero compromises in audio quality or RF dependability.

This model operates in the low UHF A1-A4 frequency band (470.000 MHz to 558.000 MHz). Featuring an expansive 88 MHz switching bandwidth, it uses highly advanced digital wireless engineering to perform with absolute linearity, making it immune to intermodulation dropouts on dense event sites.

Key Performance and Digital Transmission Attributes

  • Intermodulation-Free Linear Architecture: The SK 9000 operates completely linearly without generating destructive intermodulation artifacts. This allows sound engineers to organize a rock-solid equidistant frequency grid layout (spacing channels evenly at 600 kHz gaps) to dramatically maximize channel count without complex coordination math.

  • Dual Transmission Profiles (HD and LR):

    • High Definition (HD) Mode: Transmits uncompressed, completely natural digital audio data. It matches the sonic performance of a high-end studio cable, delivering pristine high-frequency detailing for elite vocalists and delicate instruments.

    • Long Range (LR) Mode: Employs Sennheiser’s proprietary high-robustness digital audio codec (SeDAC) paired with enhanced error correction. This mode stabilizes signal transmission over massive distances or through harsh physical obstacles on festival grounds.

  • Moisture-Insulated 3-Pin SE Socket: Outfitted with a premium, gold-plated 3-pin special connector (LEMO style) featuring physical internal gaskets. This design effectively shields the input nodes from stage sweat, heavy humidity, and rain, preventing audio shorts or structural crackle mid-event.

  • Military-Grade AES 256 Encryption: Integrated with hardware-driven AES 256 encryption protocols. Turning this feature on completely secures the digital RF stream, safeguarding sensitive corporate keynotes or secure governmental broadcasts from scanning or hijacking.

Technical Specifications Matrix

Feature Parameter Hardware Specification Profile
Model Reference Name SK 9000 A1-A4
Official Article Number 504730
RF Operational Band A1-A4 Block (470.000 MHz to 558.000 MHz)
Switching Tuning Bandwidth 88 MHz available across the low-UHF spectrum
Digital Transmission Modes High Definition (HD) Mode / Long Range (LR) Mode
Acoustic Frequency Response 30 Hz to 20,000 Hz (flat down to 3 dB)
System Dynamic Range HD Mode: 112 dBA / LR Mode: 104 dBA
Total Harmonic Distortion (THD) Less than 0.03% (measured at 1 kHz)
Audio Input Interface Node 3-pin Moisture-Resistant Locking Socket (Special SE LEMO Pin Out)
Input Impedance Profiles Microphone Input: 68 kOhms / Line Input: 1 MOhms
Audio Gain Adjustment Scale -6 dB to +42 dB (Instrument/Line adjustable in 3 dB steps)
RF Output Transmission Power HD Mode: 10 mW RMS / LR Mode: 25 mW RMS
Power Solution (Transmitter) Optional BA 61 Li-ion Accupack (6.5 hrs) or B 61 Dry Battery Case (3 x AA)
Chassis Build Material Lightweight, high-tensile Magnesium Alloy
Net Operational Weight Approx. 147 grams (including belt clip and battery pack assembly)

In the Box: Component Inventory

  • 1 x SK 9000 Digital Bodypack Transmitter (Black, A1-A4 Band)

  • 1 x Heavy-Duty Belt Clip

  • 1 x Removable Flexible Whip Antenna (Tuned for the A1-A4 range)

  • 1 x Quick Start Reference Manual

  • 1 x Safety Instructions Guide

  • (Note: Battery packs and microphone capsules are sold separately)

System Deployment and Hardware Interfacing Advice

Locking the 3-Pin LEMO Audio Interface: The SK 9000 uses a premium, moisture-resistant 3-pin connector. It pairs seamlessly with high-tier lavalier microphones (such as the MKE 1, MKE 2, MKE 40) and specialized headworn boom mics (like the SL Headmic 1 or HSP series). Ensure that you push the micro-connector into the socket until the outer collar locks with a distinct physical click. Always pull directly on the knurled metal collar to disconnect—never yank on the flexible microphone wire.

Battery Architecture Warning: To maintain low operational costs and stable weight balance, the SK 9000 does not bundle power elements out of the box. You must provision either a BA 61 rechargeable lithium-ion battery pack (delivering roughly 6.5 hours of continuous transmission tracking) or a B 61 dry battery case configured to host three standard AA batteries. Ensure that you monitor real-time battery telemetry via the backlit LCD screen or remotely inside your EM 9046 receiver channel layout.

Shipping Notes
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Exchange/Return Notes
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SKU: 32106537152

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Tim M.
Lexington, US
★★★★★ 5
Great gift idea!
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Reviewed in the United States on May 12, 2026
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Waukegan, US
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Reviewed in the United States on June 6, 2026
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Paul Frandano
Whiting, US
★★★★★ 5
A Dyadic Review: Baffling, Brilliant
Difficult. Rewarding. Serious. Hilarious. Wise. Faux-wise. Scholarly. Mock-scholarly. Observant. Absurdly, obsessively observant. Sharp characterizations. Ridiculous characters. Devout. Bawdy. Endearing. Frustrating. Genius. Barking mad. Narratively incoherent. Stream-of-consciousness associative. Consistently provincial. Profoundly universal. Mired in the 18th century. Harbinger of 20th century literary Modernism. Baffling. Brilliant Not for every taste. For my taste. And while I'm at it, let me give a shout-out for the out-of-print Norton critical edition, which provides many helps, essay avenues of understanding, and a clever chapter summary/table of contents. For so many years - since reading Moby Dick in grad school with the help of a Norton critical - this publication line has been my go-to for great texts: useful annotations, contemporary reviews, later scholarly articles, and more. And also let me give a shout-out to Anton Lesser, who narrated the complete novel for Naxos. I have never, ever experienced an audiobook as masterfully produced and narrated as Naxos' Tristram Shandy. No, it is simply not a book one can listen to and fully comprehend as heard. But one might read while listening, or listen while reading, with - if you have the riight software - the narration sped up closer to one's own reading speed, and experience the full majesty of Lesser's absolute preparation, with Latin, Greek, French, and German - as well as regional English - beautifully and humorously intoned, character voices carefully differentiated, tone and mood captured, etc. Or, as I do, go for a walk and listen as you walk, and afterward slip into a comfy chair, crack the novel open, and continue from where you left off, or backtrack if necessary to sort out the characters. In any event, and particularly for devotees of audio books, do find Anton Lesser's note-perfect reading, a veritable radio serial, perhaps the last book you'd expect anyone to attempt single-handedly, with My Father, My Uncle Toby, Corporal Trim, Parson Yorick, Doctor Slop, Widow Wadman, and all the rest of the supporting characters beautifully, consistently interpreted. Lesser is, in a galaxy of fine narrators, the greatest I've heard: an absolutely peerless voice actor in a most demanding work.
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Reviewed in the United States on June 13, 2016
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Ritesh Laud
Battle Creek, US
★★★★★ 5
Brilliant stream of consciousness style, *extremely* humorous
"The Life and Opinions..." is perhaps impossible to really classify. It purports to be a biography of the fictional Tristram Shandy, but I don't think you can call something a biography when it only covers a year or so of the subject's life! I would say that more than half of the novel actually falls into the "Opinions" referred to in the title. The rest consists of short stories on Tristram's father, uncle, and a couple other minor characters. I have never in my life read so many digressions from the topic at hand, most of which were utterly irrelevant but the charm of it is that Sterne *knows* they're irrelevant, but mockingly expresses his license of authorship in forcing the reader to go off on these sidetracks. His attitude is: "If you can't wait a chapter or two to get back to the story, well, go take a flying leap, I'm the author." Sometimes the digressions are exasperating. Very unlike Victor Hugo's signature habit of digressing, say when a certain main character in Notre Dame decides to enter the Paris sewers, Hugo takes thirty or more pages to give a history of the design and construction of the Paris sewer system. At least Hugo's digressions have *something* to do with the story. Well, maybe that's the problem. There isn't a main story in this novel. It's not a storybook. There are many short stories nested within the main framework, but there is no real protagonist or overarching theme of any sort. Indeed, the end comes abruptly and there is absolutely no resolution of any conflict. It's not trying to teach anything, really. So what is it? I'm not sure. More a comedy than anything else. Right up there with Dickens' "Pickwick Papers" in terms of humor, but lacking the story. Maybe funnier than Dickens and just as clever. I was rolling in the aisles so many times I lost count. I read the Penguin edition, edited by Melvyn & Joan New. The back cover does a better job than I could ever do in providing a sense of what you're getting into when you pick this one up: "No one description will fit this strange, eccentric, endlessly complex masterpiece. It is a fiction about fiction-writing in which the invented world is as much infused with wit and genius as the theme of inventing it. It is a joyful celebration of the infinite possibilities of the art of fiction, and a wry demonstration of its limitations." It's a large work, it will take a while to work through. It's worth it. There are passages I want to go back to and make copies of to tape to the walls, they're that brilliant.
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Reviewed in the United States on July 31, 2005
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Diogenes
Charlottesville, US
★★★★★ 3
Interesting read, but takes some getting used to
I heard about this book on a blog, and figured I'd check it out. It's the rambling tale of a man determined to give you every last detail of everything that might be important to the narrative of his life. Unfortunately, he goes on tangets so often that he doesn't even get to his birth for several chapters, let alone the story of the rest of his life. Along the way, you're introduced to lots of random characters who are (at best) loosely related to the protagonist, but as often as not these tangents are fairly amusing. The writing is pretty dense, and this along with the tangents had me putting the book down fairly often. It's probably ideal for a commuting book, but I never wanted to just sit down and blitz through big chunks of it. Overall it's a very different kind of experience than a novel reader typically gets. It's worth a read for a change of pace, but I can't say it's a life-altering read.
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Reviewed in the United States on March 21, 2013

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