Shure Wireless Ranges Compared: BLX, GLX-D+, SLX-D+, QLX-D, ULX-D and Axient Digital

Six Shure wireless microphone families, one ladder. What changes at each step: analogue or digital, UHF or 2.4/5.8 GHz, which UK band variant to buy, how many channels you can run, batteries, networking, encryption and receiver formats.

~11 min read · Updated October 2026 · By the Stage Supply team

In this guide: The short answer · The range · Comparison table · UK bands and licensing · Channel counts · Batteries · Networking and encryption · Receiver formats · Head to heads · Popular picks · FAQ

Shure sells its handheld and bodypack wireless as a ladder of separate ranges rather than one product with options. Each step up changes several things at once: the radio, the band you buy, how many channels share a space, how the system is powered and whether it joins a network. This guide puts the six current ranges side by side so you can see where the steps are.

Two pairings have their own guides, so they are kept short here: BLX vs SLX-D+ and SLX vs SLX-D. If you are choosing between the original SLX-D and the new SLX-D+, see SLX-D vs SLX-D+. For the general basics, start with our wireless microphone buying guide.

The short answer

• BLX is the entry point: analogue UHF, AA batteries, simple portable or half-rack receivers. Right for one or two channels that just need to work.
• GLX-D+ is digital and works in the 2.4 and 5.8 GHz bands rather than UHF, which Shure describes as licence-free. It comes with a rechargeable battery and suits bands and presenters who want no frequency planning. The catch is channel count.
• SLX-D+ is the first digital UHF tier. It adds Ethernet control, AES-256 encryption, rechargeable options and receivers from single to quad. For most UK venues, churches and function bands running four or more channels, this is the sensible starting point.
• QLX-D is a metal-bodied, networked digital system that packs more channels into the same spectrum than SLX-D+. It has a single-channel receiver only.
• ULX-D adds dual and quad receivers with Dante, plus a High Density mode for very large channel counts. It is the usual pick for big conference and installed systems.
• Axient Digital is the touring and broadcast flagship, with frequency diversity, Quadversity, ShowLink remote control and Dante/AES67/AES3 outputs.

If you remember one rule: buy the band before you buy the range. In the UK, the variant you order decides whether you can use Channel 38, Channel 70 or neither. See the band section below.

The range at a glance

Shure UK currently lists BLX, GLX-D+ Dual Band, SLX-D+, QLX-D, ULX-D and Axient Digital among its wireless microphone systems, alongside the new ANX4 receiver for Axient Digital and ULX-D, and MoveMic mobile wireless mics. This guide covers the six handheld and bodypack ranges.

• Analogue vs digital. Analogue systems use a compander to squeeze a voice into the narrow radio channel, then expand it again. Digital systems carry the full dynamic range without companding. In Shure's own specs, BLX quotes 50 Hz to 15 kHz and 100 dB dynamic range. The digital ranges quote 20 Hz to 20 kHz and 118 dB or more.
• UHF vs 2.4/5.8 GHz. Everything except GLX-D+ runs in UHF, where UK use mostly needs an Ofcom licence, apart from licence-exempt slots such as the narrow Channel 70. GLX-D+ works in 2.4 GHz and 5.8 GHz, the same territory as Wi-Fi.

Side-by-side comparison

All figures come from Shure's UK product pages and user guides. Channel counts depend on region and RF environment, so treat them as Shure's best case, not a promise for every venue.

UK bands and licensing

Ofcom gives you three ways to run radio mics legally. Our Channel 38 and Channel 70 guide covers licensing in detail, and licensing beyond Channel 38 covers coordinated frequencies. In short:

• Licence-exempt. Ofcom lists 863–865 MHz (Channel 70, 10 mW, typically up to 4 frequencies together), 173.7–175.1 MHz VHF, and 2400–2483.5 MHz.
• Channel 38 shared licence. 606.500–613.500 MHz, available under Ofcom's UK Wireless Microphone Licence on a shared, non-protected basis. Ofcom publishes a 10-channel frequency plan for it.
• Coordinated frequencies. For most other UHF spectrum, Ofcom assigns frequencies for your site or event.

Now map the Shure band codes onto that:

Each range ships in several bands, and Shure notes that not every band is sold or authorised in every country. The UHF systems we mainly stock are the 606 MHz-based variants: BLX K3E, SLX-D+ K55, QLX-D K51 and ULX-D K51. All four cover Channel 38. Our GLX-D+ systems are the Z4 version.

How many channels can you actually run?

Shure quotes channel counts per TV channel (6 MHz in the Americas, 8 MHz in Europe) or per band. In the UK, Channel 38 is 7 MHz wide (606.5–613.5 MHz) and Ofcom publishes a 10-frequency plan for it. Ofcom says that plan is only a suggestion, and manufacturers' own frequency plans can fit more, especially on digital systems. Once Channel 38 is full, you need coordinated frequencies whatever range you own.

• BLX: up to 12 systems per frequency band. On a K3E system that is spread over 24 MHz, so not all of it sits inside Channel 38.
• GLX-D+: without the GLXD+FM Frequency Manager, up to 4 typical, 8 optimal. With GLXD+FM and GLXD4R+ rack receivers, up to 11 typical, 16 optimal. This is the main limit of the range.
• SLX-D+: up to 11 systems per 6 MHz and 14 per 8 MHz TV channel, across an 88 MHz tuning window on K55.
• QLX-D: up to 17 per 6 MHz and 22 per 8 MHz, and more than 60 compatible channels across a 64 MHz band.
• ULX-D and Axient Digital: High Density mode allows up to 47 transmitters per 6 MHz and 63 per 8 MHz. Shure positions it for many channels in a confined area over short distances (on ULX-D, up to 30 metres of range in High Density mode). Shure's ANX4 receives up to 16 Axient Digital or 24 ULX-D channels in one rack space, with channel licences sold separately.

More channels on UHF also means more care with antennas. Once you rack several receivers, look at antenna distribution such as the UA844+SWB and directional antennas like the PA805. See our antennas and RF distribution guide.

Batteries and rechargeable options

• BLX runs on two AA batteries, with Shure quoting up to 14 hours from alkalines.
• GLX-D+ comes with the SB904 lithium-ion battery, rated up to 12 hours. It charges in the receiver or over USB-C on the transmitter, and a 15-minute quick charge gives about 1.5 hours.
• SLX-D+ runs on two AA batteries or the optional SB903 rechargeable, with up to 8 hours either way (5.5 hours for the SLXD5+ portable receiver). Chargers come in single-bay, dual-bay and 8-bay rack-drawer versions.
• QLX-D takes SB900-series rechargeables, such as the SB900C, with remaining time shown in hours and minutes. Shure's product page quotes up to 10 hours on its rechargeables and 9 hours on AAs; the QLX-D user guide gives over 11 hours on an SB900C and 8 hours on alkalines.
• ULX-D also uses SB900-series batteries, up to 12 hours, and stays AA-compatible. Axient Digital adds networked charging with remote monitoring of runtime and charge status.

Networking, control and encryption

This is where the ranges split most clearly. BLX and GLX-D+ are standalone systems. GLX-D+ rack receivers can share frequency data through the GLXD+FM Frequency Manager, but Shure does not list Ethernet control or encryption for either range.

• SLX-D+ adds Ethernet with Wireless Workbench and third-party control, plus the WWB Mobile app over Wi-Fi or Bluetooth. ShowLink Ease lets the receiver change a transmitter's frequency, power, lock state and firmware over the air. It also has Digital Feedback Reduction and AES-256 encryption. The quad comes as standard SLXD4Q+ or SLXD4QDAN+ with Dante.
• QLX-D has Ethernet networking with network channel scanning across receivers, Wireless Workbench and ShurePlus Channels, AMX/Crestron control and AES-256 encryption.
• ULX-D adds Dante on the dual and quad receivers, RF cascade ports, dual Ethernet, audio summing, bodypack frequency diversity and Dante Domain Manager compatibility, plus AES-256.
• Axient Digital adds Dante/AES67 and AES3 outputs, Dante Cue and Dante Browse monitoring, ShowLink remote control of ADX transmitters over 2.4 GHz, frequency diversity, Quadversity and interference avoidance with the AXT600 Spectrum Manager.

Receiver formats: single, dual, quad and portable

On a fully loaded QLX-D rack, every channel is its own half-rack box. That is one practical reason larger installs move to ULX-D dual and quad receivers.

The common head-to-heads

GLX vs SLX (GLX-D+ vs SLX-D+)

Both are digital. The difference is spectrum and scale. GLX-D+ avoids UHF altogether: it scans 2.4 and 5.8 GHz, moves away from interference automatically and needs no licence according to Shure, but it shares those bands with Wi-Fi and tops out at around 4 to 8 systems without the frequency manager. SLX-D+ works in UHF, so in the UK you plan around Channel 38 or coordinated frequencies. In return you get far more channels, Ethernet control, encryption and dual or quad receivers. For a solo act or a pair of presenter mics, GLX-D+ is the simpler buy. For a rack of six or more, choose SLX-D+.

BLX vs GLX-D+ vs SLX-D+

These are the three entry tiers. BLX is analogue UHF on AA batteries. GLX-D+ is digital and rechargeable out of the box in 2.4/5.8 GHz. SLX-D+ is digital UHF with proper networking and the most room to grow. Our BLX vs SLX-D+ guide covers the first and last in depth, and EW-D vs SLX-D+ covers the cross-brand alternative.

SLX vs QLX-D (SLX-D+ vs QLX-D)

Both are 24-bit digital UHF with Ethernet and AES-256. QLX-D fits more channels into the same spectrum (22 vs 14 per 8 MHz), has an all-metal transmitter and receiver build, and can be paired with ULX-D transmitters and receivers, including the ULX-D boundary and gooseneck transmitters. SLX-D+ has the wider K55 tuning window, ShowLink Ease remote transmitter control, built-in feedback reduction, and dual and quad receivers, which QLX-D does not offer. For a rack of ordinary vocal and presenter channels in Channel 38, SLX-D+ is usually the more practical choice. QLX-D earns its place when spectrum is tight and you will coordinate frequencies.

QLX-D vs ULX-D

Both use K51 in our stock and the same SB900 rechargeables. ULX-D adds a 20 mW power setting in some bands (K51 is limited to 1 or 10 mW, the same as QLX-D), dual and quad receivers with Dante, High Density mode and bodypack frequency diversity. Shure also lets QLX-D and ULX-D transmitters and receivers be paired with each other, provided encryption is off, High Density mode is off and both are tuned manually to the same frequency. If you need Dante or more than a handful of channels in one rack, go ULX-D.

AD4Q vs ADX5D

These are both Axient Digital receivers, built for different jobs. The AD4Q is a four-channel rack receiver (44 mm high, so one rack unit) with Dante, AES67 and AES3 outputs, Quadversity and frequency diversity. The ADX5D is a two-channel portable receiver for camera slots and audio bags, 29 x 88 x 108 mm without a backplate. It offers a choice of backplates and battery sleds, and the option of AES3 on output 1. Choose the AD4Q for a stage or install rack and the ADX5D for location and broadcast.

Popular picks from the shop

Frequently asked questions

What is the difference between Shure BLX, SLX-D+ and QLX-D?

BLX is analogue UHF on AA batteries with simple receivers. SLX-D+ is 24-bit digital UHF with Ethernet control, AES-256 encryption, rechargeable options and single, dual and quad receivers. QLX-D is digital too, with a metal build and single receivers, and it fits more channels into the same spectrum (22 vs 14 per 8 MHz TV channel).

Is GLX-D+ licence-free in the UK?

Shure describes GLX-D+ as using a licence-free frequency range: 2.4 GHz and 5.8 GHz (the Z4 band). Ofcom lists 2400–2483.5 MHz as licence-exempt for wireless microphones, and its licence-exemption rules for short-range devices (IR 2030) also cover 5725–5875 MHz. The trade-off is that you share those bands with Wi-Fi, and the system count is lower than on UHF.

Which Shure band should I buy in the UK?

For UHF, choose a band that starts at 606 MHz so it covers Channel 38: K3E for BLX, K55 for SLX-D+, K51 for QLX-D and ULX-D. If you will not buy the Channel 38 licence, a band containing 863–865 MHz (such as S50) keeps you in licence-exempt Channel 70. That gives you only a few channels.

Can I mix Shure ranges, like an SLX-D+ transmitter with a QLX-D receiver?

No. Transmitters pair with receivers of their own range. The exceptions Shure lists are SLX-D+ receivers, which work with original SLX-D transmitters in the matching band (K55 with K59), and QLX-D with ULX-D: Shure says transmitters and receivers from the two ranges can be paired, with encryption and High Density mode off and both tuned manually to the same frequency. The ANX4 receiver also runs either Axient Digital or ULX-D transmitters. Capsules are a separate question: see our capsule compatibility guide.

Do I need Axient Digital?

Only if you run large channel counts in crowded spectrum, need frequency diversity and remote transmitter control, or work in broadcast. For most UK venues, churches and bands, SLX-D+ or ULX-D covers the job.