Wireless microphone with no sound: tracing the signal at an event

Identify the microphone and where the voice is missing

Ask the speaker to say a short, recognizable phrase. Note the microphone, receiver and console channel assigned to that voice; compare the labels with the actual connections. If equipment moved between segments, a label may still refer to an earlier setup.

Check whether other sources can still be heard at that destination. Hearing music in the room is useful evidence, but you still need to trace the microphone. If no other sources are audible either, tell the technician and check the part of the system they share.

At the transmitter: check power, input and mute separately

Check the battery, power and connected microphone as appropriate for the model. With a lavalier or headset, identify the capsule, connector and transmitter before trying a replacement. A connector that fits does not establish compatibility.

Check the mute state and what the model's meter actually measures. It may display a stage before muting. For ULXD1/2 with ULXD4, see the guide to ULX-D transmitter mute, then check the output.

At the receiver: check RF and audio separately

Use the same phrase and record what the receiver shows while it is spoken. Separating radio reception from audio level helps you choose the next point to check. Read the model's indicator definitions; RF activity alone does not establish that the intended transmitter is being received.

If reception fails, compare the frequency, band and units with the agreed plan and follow the RF coordination guide. If reception appears stable, trace the audio: mute, input and output still need checking.

For an EW-D EM receiver, see the guidance on a steady or flashing yellow LINK indicator. Record the exact state; indicator meanings vary by model.

Trace the receiver output to an identified input

Identify the connector used, the cable and the input it reaches. The technician needs to confirm the output level, the level expected at that input and the power requirements of the equipment. Use a monitoring point provided by that model and identify its position in the signal path. Do not assume every receiver has a headphone output.

To compare a cable or unit, prepare compatible replacements and test outside the live segment, with levels controlled by the operator. Keep the rest of the route unchanged and record what you replaced. If you also change the console input, note that as a second changed condition.

At the console: confirm the source, channel and monitoring point

A channel named Presenter does not establish which port feeds it. Check the assigned source and look for the test phrase on the appropriate input meter. Identify the point you are observing before deciding the fault is farther downstream.

When listening through PFL, AFL or PAFL, record the selected tap point. Mute, fader or processing stages may lie between input monitoring and the house mix. For an SQ, see the guide to the PAFL monitoring point.

On QL5/QL1 V5.8, INPUT CUE offers PFL, AFL and POST PAN. Check the tap point and active group. Before monitoring for diagnosis, make sure SOLO ON is off: that mode can mute other channels on the buses. Hearing the input through PFL still leaves the house mix and output to be checked. Yamaha: CUE and SOLO, pp. 113–115.

If the input has audio, follow the mix that needs it

With the operator, confirm which mix should receive the voice and which channel, group or send settings affect it. Do not raise a fader just because it is labeled Microphone: first identify the channel and mix you are controlling.

Listen at the intended destination. If the room receives the voice but the recording does not, record that difference and trace the route to the recorder. If the voice is only audible in the console headphones, check the mix and output. The hybrid panel guide covers remote participants and multiple audio feeds.

During the live segment, hand over the prepared backup

Agree with the show lead who will hand over the prepared microphone and who will enable its channel. The backup must feed the segment's destinations: the room and, where required, remote participants, the livestream or recording. Check the voice after the changeover.

Record which unit you removed and keep it labeled for a later test. If the backup does not restore the voice, check what the two paths share before replacing more equipment. For rehearsing the changeover and return, follow the conference continuity guide.

Record the first point that failed the test

Record the test phrase, the points observed, the change made and the result at each destination. A brief recovery lets you continue testing; record the test duration and signal route before considering the issue resolved.

Download the diagnostic worksheet. It has spaces for observations, the test and its result. When requesting support, include models, versions and the signal route. A note such as “the receiver shows RF, but channel 7 shows no voice during the test phrase” helps identify the next test point.

ULXD4D/ULXD4Q: Rx MUTED, unavailable gain controls and power cycling

The Dual/Quad manual states that Rx MUTED replaces the gain value and that gain controls are unavailable on muted channels. To unmute, select AUDIO → MUTE → OFF and press ENTER, or press ▲▼ together. Agree with the operator when to enable the output.

Shure warns that cycling receiver power cancels audio mute. Record the state before and after in the worksheet, outside the live segment. Audio returning after a restart does not establish the cause. Also compare transmitter mute.

ULXD1/ULXD2: audio mute and RF MUTED are different states

The ULX-D manual explains that UTILITY → MUTE MODE → ON turns the power switch into an audio mute while keeping RF active. The transmitter displays AUDIO MUTED; the receiver displays Tx Muted. RF MUTE lets the transmitter start without transmitting RF: hold EXIT while powering on until RF MUTED appears. Shure specifies restarting the transmitter to leave this mode.

Compare the message, RF and audio in the worksheet, using identified units outside the live program. Audio mute keeps RF active: it does not free that frequency. When changing equipment, check the RF plan.

ULXD4 with ULXD1/ULXD2: what changes during IR Sync

For ULXD4 with ULXD1/ULXD2, the manual states that IR PRESETS applies settings during synchronization. KEEP retains that transmitter parameter; it does not promise to leave the entire configuration unchanged. Check RF POWER, BP PAD and MUTE MODE. KEEP is the default for each parameter.

Record values before and after in the worksheet, outside the live program. Test the backup's voice at every destination: KEEP may retain a different setting. Also check mute.

ULXD4Q: alternating encrypted bodypack and handheld transmitters

For units with configurable encryption, the Dual/Quad manual specifies DEVICE UTILITIES → ENCRYPTION → ON (Manual) → KEEP KEYS, then ENTER and synchronization of the first transmitter. Turn it off before synchronizing the next one. Keep only one transmitter sharing that channel powered on. Some units have fixed encryption that cannot be configured.

KEEP KEYS retains encryption keys; it is different from KEEP in IR PRESETS. If you regenerate keys, resynchronize every backup. Rehearse alternating transmitters and record the voice in the worksheet. Check the RF plan.

ULXD1/ULXD2: match levels before switching to the backup

Do not copy a gain setting from another system. AD2 with KSM8 and ULXD1/ULXD2 have their own documentation; use the controls for the transmitter you have identified.

The ULX-D manual uses UTILITY → MIC.OFFSET to compensate for differences between transmitters sharing a channel. ULXD1/ULXD2 provide 0 to +21 dB in 3 dB steps. Shure specifies receiver gain for routine adjustments.

Compare both transmitters with the same person and intended microphone position, powering only one at a time. Record offset, gain and the voice in the worksheet. Repeat after IR Sync: the backup needs to be tested.

AD2: different voices, Offset and the OVERLOAD warning

The AD2 manual assigns Audio → Offset to matching transmitters; it specifies 0 dB when using a single transmitter. The range is −12 to +21 dB. For input OVERLOAD, Shure specifies reducing the input signal or moving the microphone farther from the source.

During rehearsal, test quiet and loud speech and record the exact message in the worksheet. Check level and microphone position before compensating for the next speaker. Reducing Offset is not listed as the remedy for Input Overload.

ULXD4Q: check gain and metering when switching from XLR to Dante

The Dual/Quad manual provides receiver gain adjustment through ▲▼ or AUDIO, from −18 to +42 dB. The OL LED indicates that the internal limiter is active; transmitter input clipping is covered separately. These are different observations.

Record the route, gain, meter reading and voice at each destination in the worksheet, before and after the change. Do not copy settings without listening to each output. For dropouts, check Dante; for level differences between microphones, check Offset.