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
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 32106537152

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Chris
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★★★★★ 5
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Color: White, Size: Queen(Pack of 2)
I recently purchased the Jumbo size pillows. After trying a week, I couldn’t be happier with them! The size is perfect—nice and full without feeling bulky. They provide just the right amount of medium support, keeping my head and neck comfortable whether I’m sleeping on my back or side. The 100% cotton cover feels soft and breathable, and the pillows stay cool throughout the night. I also love the gusseted design—it really helps the pillows maintain their shape and gives them that luxury hotel feel. Even after several nights of use, they haven’t gone flat. Another big plus is that they’re machine washable, which makes maintenance super easy. Overall, these Jumbo pillows are plush, supportive, and great quality for the price. Highly recommend!
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Reviewed in the United States on March 1, 2026
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Crystal
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★★★★★ 5
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Color: White, Size: King(Pack of 2)
These are so insanely comfortable! They have the perfect amount of softness and support. Not too flat, not too full, just right. You will sink into it like a big marshmallow!
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Reviewed in the United States on May 22, 2026
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Laura Moya
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Comfortable pillows 🤩
Color: White, Size: Queen(Pack of 2), Color: White, Size: Queen(Pack of 2)
I bought the Serta Hotel Collection Bed Pillows (Queen size) and I absolutely loved them. They are super soft yet provide great support; they feel very comfortable and help make for a much better, more pleasant night's sleep. Plus, the fabric is cool and of high quality. I recommend them wholeheartedly!
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Reviewed in the United States on April 22, 2026
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Charlston T. Ang
Louisville, US
★★★★★ 5
Amazingly Comfortable — Like Sleeping in a Luxury Hotel Every Night
Color: White, Size: Queen(Pack of 2)
I rarely write reviews, but these Serta Hotel Collection pillows absolutely deserve one. From the very first night, they felt incredibly comfortable — soft yet supportive in all the right places. I tend to switch between back and side sleeping, and these pillows adjusted perfectly no matter my position. The 400-thread count cotton cover feels smooth and luxurious, and the gusseted edges give just the right amount of lift without feeling stiff. What really surprised me was how easy it was to adjust to them. Usually, it takes a few nights to get used to a new pillow, but I slept soundly from day one — no neck aches, no tossing and turning. They have that “hotel bed” feel — plush, breathable, and restful. Every morning, I wake up feeling like I stayed at a high-end resort. For the quality, comfort, and price, this set is an absolute win. Highly recommend to anyone looking to upgrade their sleep!
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Reviewed in the United States on February 8, 2026
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AW
Belleville, US
★★★★★ 4
Amazing pillows!
Color: White, Size: Queen(Pack of 2)
These are fantastic pillows! A little background. I'm a side sleeper and toss and turn throughout the night. I've struggled with sleep issues for literally decades - insomnia, tossing and turning, waking up multiple times a night to use the bathroom, waking up way too early and not being able to get back to sleep. Every night it's a combo of those things or all of those things. I've also had some neck pain and stiffness for a couple of months. If you've ever dealt with that you know it will affect sleep which will then affect productivity and mood. It's a terrible spiraling and compounding thing to deal with, very stressful. I figured the contour pillow I had which once was actually helping was unfortunately the culprit. So I went on the hunt for another pillow. I ordered what I thought was the old Rejuvenite pillow (those were fabulous!) and got burned on a bait and switch. The pillow ended up being way too soft and gave me worse neck pain. Figuring I'd try to salvage what was a $115 pillow, I invested in a very thin pillow to put underneath. It was too high. Getting pretty frustrated, I ordered the cheaper Utopia pillows here on Amazon. Those actually were not terrible because they did take away my neck pain, but I was still tossing and turning at night and still feeling unrested in the morning. I decided I'd give it one last shot and luckily found these when they were discounted by a few bucks. They didn't have many reviews which was actually a great sign for me because it means the company lets their product speak for itself. I got these in several days and was thrilled to see upon opening the package that they were sealed and the directions do not require you to open the package and let them expand for 24 hours. You literally just take the edges and fluff 2-3 times and that's it! They are ready to go and they definitely do feel perfect after doing that. I was skeptical when I put them on my bed because they are soft and I worried they'd be too soft. I felt my head sink into the pillow a bit and then was surprised to feel at a certain point it just feels like the pillow is cradling your head with the right amount of support. I wouldn't describe it as firm, just soft but stable support. Really comfortable. But the real test was how it would perform during sleep. I'm so thrilled to report that I had an amazing night of sleep! No neck pain, no stiffness, zero tossing and turning, no insomnia, no waking up during the middle of the night, and no waking up early. I put my head down, fell asleep, and slept like a log for about 7.5 hours straight, which is literally unheard of in my world. I'm very lucky if I get 5 solid hours of sleep. I woke up and popped out of bed. My mood was great (still is later in the day) and I was not tired in the afternoon when I normally feel the fatigue kicking in. This is the first day for as long as I can remember that I do not feel that nagging tiredness behind my eyes and in my body that always seems to be a steady background actor in my life. I feel great and full of energy and I was able to tackle a bunch of tasks on my someday list. This is so promising I didn't want to wait to share. If you are on the fence and are dealing with similar issues to mine, I'd encourage you to just try these. What's also amazing is these come in a set. I'm only using one so I basically have another one to use if the first one ever fails. This is the best investment for sleep I've ever made! Update: Well, after a trial period I'm removing a star because my dreamy sleep was short lived. I started to wake up more frequently during the night with these and gave up midway through the night one night. I'm still using these for back support while I sit up or hang out in bed because they are still super comfortable that way and oddly these work well for naps. Hopefully, you have better luck than me!
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Reviewed in the United States on February 21, 2026

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