Twenty-four channels of Shure ULX-D used to mean using six quad receivers. 

Sixteen channels of Shure Axient Digital use to mean using four quad receiver.

That's a lot of hardware for one job.

The Shure ANX4 does that job in a single rack space. 

It took home a Best of Show award at InfoComm 2025, and once you see what's inside the box, it's easy to understand why.

• How the Shure ANX4 fits up to 24 ULX-D and 16 Axient Digital wireless channels into one rack unit
• Axient Digital vs. ULX-D, and how to choose for your show
• How channel licensing works for the Shure ANX4 (and why it's nothing to worry about)
• The front panel, rear I/O, and network control
• Where the ANX4 fits best, and what to plan for in pre-production

The ANX4 is a scalable wireless receiver that handles up to 16 channels of Axient Digital or up to 24 channels of ULX-D in 1RU.

Here's what that looks like on paper.

Sixteen channels of Axient typically means using four quad receivers. Twenty-four channels of ULX-D means six. 

With the Shure ANX4, it's just one box. 

Think of it as a full rack of quads folded into a single rack space.

• Less rack space — shorter racks, smaller footprints at FOH or monitor world
• Less weight — easier handling and more room in the truck
• Simpler antenna setup — four antenna inputs feed every channel, instead of splitting RF across a stack of receivers
• Faster load-in — fewer units to rack, cable, and power

The ANX4 runs both of Shure's flagship digital systems. The choice comes down to what the show demands.

Axient Digital is Shure's top tier. It's what you reach for on the biggest, most RF-crowded shows — broadcast, high-profile general sessions, anything where the margin for error is zero.

ULX-D is the workhorse. It's reliable, it's everywhere, and on the ANX4 it gets you more channels per receiver. It also supports ULX-D's High Density mode, so you can pack more channels into tight spectrum when the RF environment is crowded.

One important detail: the ANX4 runs one system at a time, not both at once. But it can run Axient on one show and ULX-D on the next. You just pick the system that fits your show.

Here's what makes the Shure ANX4 different from every receiver that came before it.

The ANX4 ships with zero active channels. Channels are activated through licenses (sold as singles or four-packs) so each unit runs exactly the channel count it needs.

We know..."licenses" make everybody nervous. So let's clear that up:

• They're perpetual. Bought once. No subscription, no expiration.
• They're portable. Licenses live in a ShureCloud account and can be pulled from one ANX4 and activated in another.
• They're flexible. A license can run as Axient or ULX-D, though each receiver runs one system at a time.

What does that mean if you're renting the Shure ANX4? 

Licensing is handled by us. Tell us your channel count and your system, and we'll configure each unit for your show before it ships.

Shure ANX4 Front Panel

Built for fast reads under pressure.

• 6-inch color display with a five-segment channel quality meter for every channel. One glance tells you if you're healthy.
• ¼-inch headphone jack with Dante Browse — listen to any channel right from the front of the rack, no hunting through a console to check a mic.

Shure ANX4 Around Back

Clean RF in. Networked audio out. No analog breakout in between.

• Four antenna inputs with a tuning range of 174 MHz to 2 GHz. One receiver covers pretty much every Axient Digital and ULX-D option (with one exception: the ULX-D 902 MHz band isn't supported).
• Four Ethernet ports for network control and Dante or AES67 output, straight into your console. Fewer cables, fewer conversion points, cleaner signal path.

The ANX4 is fully controllable in Shure Wireless Workbench, so your RF tech can monitor and manage every channel from anywhere on the network — FOH, monitor world, or the RF desk backstage.

And with 256-bit AES encryption, the ANX4 is ready for shows where the audio can't leave the room: executive briefings, earnings calls, confidential product reveals.

Picture a corporate general session in a hotel ballroom. Keynote presenters, a six-person panel, an awards segment, and a handful of handhelds for audience Q&A. That's easily 20+ wireless channels.

The traditional build means a stack of ULX-D quads and antenna distribution at FOH. With the ANX4, it's one rack unit running ULX-D in High Density mode, Dante straight into the console, and your RF tech watching every channel in Wireless Workbench. Same coverage. A fraction of the hardware.

Now say your next show is a broadcast awards night that calls for Axient Digital. Same receiver. Different mode. Your rack design stays consistent from show to show.

Things to keep in mind:

• One system per receiver. Each ANX4 runs Axient Digital or ULX-D, not both at once. Lock in your system during pre-production and match your transmitters to it. If a show calls for both systems, plan for a receiver per system.
• The ULX-D 902 MHz band isn't covered. If your transmitters live in that band, factor it into frequency coordination early.
• Outputs are networked. Audio comes out over Dante or AES67, not analog. If your console isn't on Dante or AES67, plan for a Dante interface in your system design.
• Channel counts top out per unit. Sixteen channels of Axient or 24 of ULX-D per receiver. Bigger channel counts simply mean more ANX4s — still a fraction of the rack space of traditional quads.

Where it excels:

• Corporate general sessions with high presenter, panel, and Q&A mic counts
• Broadcast and streamed events where Axient Digital's RF performance is non-negotiable
• Awards shows and galas running dozens of handhelds and lavs through a single show
• Theater and musical productions with large lav counts in crowded RF environments
• Multi-day conferences where channel needs shift from session to session
• Fly packs and touring rigs where every rack unit and every pound counts
• Confidential events that require encrypted wireless audio