Take Control of Wireless Microphones
By: Chris Huff
Whatís your biggest frustration with wireless microphones?
1. Poor battery life
If you have to use single-use batteries, check the microphone manual for what the manufacturer recommends. I prefer the rechargeable route. You pay more upfront, but the batteries will last for years. Thatís also fewer batteries going in the trash or recycling bin. If you run multiple services on the weekend, turn the microphones/battery packs off between services. Once you have reliable batteries that can last five or six hours, then itís not a concern.
2. Difficult frequency coordination with multiple microphones
3. Off/Mute control inadvertently activated
As a tip, record the channel frequency settings the microphone uses in case itís accidentally reset or changed. While newer systems enable device-pairing (as long as you are within about three inches between the two devices), sometimes itís faster to use the controls to reset it yourself Ė especially when you are backstage such as at a larger church. You might even write in on a label inside the battery compartment. Some allow for disabling the mute button.
Sometimes a pastor might say they want to keep control of the power to their microphone. When this is the case, remind them they will have a delay between when they turn it on and when they can use it.
4. Poor microphone technique
5. Poor design
When it comes to buying a new wireless microphone, check them out in the store. Are batteries secured? Does anything use light-weight plastic? I prefer metal transmitter packs, but when price is a concern, that becomes a trade-off.
Hereís a tip on equipment that uses 9V batteries. The plus terminal, the larger one, can widen from use. If the battery isnít fitting as snug as before, use a small pair of pliers to gently squeeze it a little to decrease the gap inside.
6. High cost
There are several options, and much of it depends on your budget. Buy high quality when you can. If you canít, either go wired or prioritize. For example, spend the extra money for a wireless microphone for the pastor and the worship leader and then buy wired or lower-priced wireless for all other uses.
7. Interference / signal drops
If interference or signal drops occur on a regular basis, use the auto-scan feature to find a new transmission frequency. Pick a different one if it first gives you the same one. Make sure there arenít other microphones in the same area that use that frequency channel. For example, if you have two wireless systems in the same building, such as one in the sanctuary and one in the youth venue, by turning one on, it can block the other or you pick it up instead.
If you still canít get a consistently clear signal, look into an RF analyzer (or call someone who has one) and run it for a few hours to find out whatís going on. Only then can you find out what wireless frequencies are really safe for use.
8. Lav mics with feedback ring
Also, a wireless microphone has a gain control on the transmitter and if the gain is set too high, the consoleís channel gain might be set to zero with the signal still bleeding through. Or, the transmitter gain could be set too low and therefore require excessive gain on the channel and thus either dealing with feedback or excessive line noise.
When a pastor is using a lav microphone on stage, make sure their channel is not routed to the monitor and that all stage microphones are muted if not in use. Also, review the gain structure during the sound check by setting the fader at 0 and the gain at the 10 oíclock position if on analog (on digital, go with about a 30% gain to start Ė or wherever the console suggests if it indicates a preferred range). Then have the pastor speak on stage. If itís too loud, turn back the gain on their wireless transmitter. If itís not loud enough, boost it. Repeat until you get a strong signal and sound without feedback or line noise. If you still get a little feedback, notch it out with an EQ cut Ė it might have to do with the room.
9. User constantly readjusts their headset
A huge tip that will help is to make sure each person has their own dedicated head-worn microphone. You donít want the pastor to wear it one day and the next weekend theyíre on vacation and someone else is bending the wires to fit their head. Too much wear and tear and youíll have to replace the microphones. Also, when someone has their own microphone, they can bend it to fit and then never struggle with it except for the occasional adjustment.
As you can see, wireless microphones come with a host of potential problems, but all can be overcome!
Chris Huff is the owner of Behind the Mixer, a resource for churches and their research into sound systems, www.BehindtheMixer.com.