Shure BLX24/SM58 Review: The Default First Wireless, and Its One Real Flaw

Three things, and only one of them is the radio. The first is the SM58 capsule, which is the same cartridge as the wired Shure SM58 Pro XLR Dynamic Vocal Microphone at $109.00. Its cardioid pattern rejects roughly 25 dB directly behind the grille, which is what lets a hand-held vocal survive in front of a floor wedge, and it tolerates being dropped on a tile floor by a nine year old holding it for a Christmas reading.

The second is a receiver that tunes across a defined band letter and can run up to twelve compatible systems within that band. The third is battery life: 14 hours from two AA alkaline cells, which is three Sundays plus rehearsals for most churches. Work out what your own transmitter count will cost to feed with the wireless battery calculator before you decide between alkaline and rechargeable.

What you are not buying is frequency agility across the whole UHF range. BLX is sold in fixed band letters, so the H10 or H9 receiver you buy tunes inside its own slice and nowhere else. That is fine in a quiet market and a real constraint in a dense one. Check what is open where your building sits with the wireless microphone channel calculator.

The line that decides whether this system works in your building is not the range figure, it is the simultaneous system count.

This is the thing that separates BLX from everything above it and it is rarely said plainly. The BLX4 receiver has one antenna. A diversity receiver has two, with the electronics constantly choosing whichever is receiving better, which is how a system rides out the moving nulls that a person walking across a platform creates. A single antenna receiver has no second opinion. When the transmitter reaches a null, the audio drops.

In a small room with the receiver in line of sight of the platform, that almost never happens and the BLX behaves faultlessly. In a long sanctuary with the rack in a closet behind a block wall, or with a pastor who walks the centre aisle to the back row, it happens enough to be noticed from the pews. If either of those describes your building, the honest recommendation is to step up to a diversity receiver rather than to buy two BLX systems. The Sennheiser reviewed at EW 100 G4 is the cheapest true diversity option here.

The practical mitigation if you already own BLX: put the receiver in the room, not in a closet, at head height or above, with its antenna vertical and at least a few feet from metal and from the network switch. That single change fixes most reported dropouts.

Across published owner reviews the recurring praise is durability and the absence of surprises. Churches report units in weekly service for many years, capsules surviving drops, and volunteers who can be taught the whole system in five minutes because there are only a group and a channel to set. The SM58 capsule draws the same comment it has drawn for decades: nobody is excited by it and nobody has to think about it.

The consistent criticisms are three. Dropouts in larger or more obstructed rooms, which is the single antenna design. Frustration when a church tries to add a fifth or sixth channel and discovers the band is crowded. And plastic build on the receiver and bodypack relative to the metal transmitters higher up the line. None of these is a defect; all three are the shape of a $389 system.

Budget pick, because the receiver is identical: the BLX24/PG58 at $329.00 is the same BLX4 receiver with a PG58 capsule instead of an SM58. If the channel is announcements rather than worship vocals, the capsule difference matters less than the fifty dollars, and the upgrade path later is just a capsule.

Step-up alternative, because density is the real constraint: the SLXD24/SM58 at $769.00 is digital, rack mountable and fits far more channels in the same spectrum. Worth it the moment you pass about six channels. The full comparison is at BLX versus SLX-D.

Sidestep alternative, because some churches should leave UHF entirely: the GLXD24+/SM58 at $659.00 runs in 2.4 and 5.8 GHz with automatic frequency management and a rechargeable battery, so there is no coordination to do. The trade is range and sharing the band with your Wi-Fi, covered at UHF versus 2.4 GHz.

Buy it for one to four channels in a room under about 400 seats, with the receiver in the same space as the transmitter. Buy it if your volunteers change every month and the system has to be teachable in one service. Buy it if the alternative is a no-name system in an unverified band, which is a far worse outcome than any compromise here.

Do not buy it as channels five through ten of a growing system, and do not buy it for a building where the rack lives behind masonry. Both of those point at digital. The wider field is in the wireless microphone roundup, and if this channel is for preaching rather than singing, read the preaching pastor microphone page first, because a handheld is rarely the right answer there.