Every microphone we send out gets tested at the shop before it goes in the truck, and then again in the room before the event starts. That is the rule. It came from a night about eighteen years ago when a brand new wireless mic failed at a fundraiser in a downtown Nashville ballroom. The presenter tapped it, said "can you hear me," and nothing happened. We swapped in a backup under thirty seconds, but I still remember the cold feeling in my chest. So now we test everything twice.
Why microphones fail
Wireless microphones have a lot of moving parts: the capsule, the transmitter, the receiver, the antenna, and the battery. A failure can happen in any one of them. The most common issues I see in Nashville venues are:
- Battery corrosion from a mic that sat in a drawer for a year
- Interference from other wireless devices in the building
- A receiver tuned to the wrong frequency
- A cable that was stepped on one too many times
Most of these are preventable with a simple test. At the shop, we check the signal strength, the battery level, and the audio quality. In the room, we walk the stage and the seating area while the mic is live, listening for dead spots. That second test is the one that catches the room-specific issues.
What "testing twice" actually looks like
For every event, we follow a simple sequence:
- Test the microphone on the bench before packing
- Set up the system in the venue and test the wireless signal from every position the presenter will use
- Swap in a fresh set of batteries right before doors open
- Keep a wired handheld microphone plugged in as a backup
That last step is non-negotiable. A wired mic does not care about interference or batteries. It just works.
A story from the Omni
I once had a client who insisted we skip the second test because the room was running late. We did it anyway while the first guests were walking in, and we found that a nearby video switcher was causing intermittent dropouts on one channel. We changed the frequency, and the keynote went flawlessly. The client never knew there was a problem.
The events that people remember are the ones where nothing went wrong. And nothing went wrong because we tested it twice.
Your takeaway
If you are planning any event with a microphone, ask your AV partner when they test. If they say they test before the event, ask if that includes a walk test. If they look confused, find someone else. The best vendors in Nashville will tell you exactly what we do: test every mic twice, and carry a backup for every one.
