Navigating Wireless Microphone Systems
Wireless microphones offer freedom of movement and a clean stage aesthetic — but they introduce a layer of technical complexity that wired mics don't have. Here's everything you need to know to plan a successful wireless system.
Understanding Frequency Coordination
Wireless microphones broadcast on UHF or VHF radio frequencies. Every wireless system in use at your event must operate on a different frequency — and those frequencies must be clear of local TV broadcasts, cellular signals, and other wireless devices in the venue.
Professional frequency coordination is not optional for events with more than two or three wireless systems. We use Shure Wireless Workbench and professional scanning equipment to identify clean frequencies at your venue before show day.
FCC Licensing and Compliance
In the United States, wireless microphones operating on TV band frequencies (470–608 MHz and 617–652 MHz) must be licensed if transmitting at more than 50mW. For professional events, FCC Part 74 licensing is required.
At Harmonic Production, all of our wireless inventory is licensed and frequency-coordinated. You never have to worry about compliance issues.
Capsule Types
Handheld wireless — The most recognizable form factor. Available with a wide range of capsule types (cardioid, supercardioid, hypercardioid) and capsule brands. Many professional engineers specify particular capsule choices in their technical riders.
Lavalier (lapel) wireless — Small, clip-on microphone with the transmitter worn on the body. Ideal for presentations, theater, broadcast, and any application where the speaker needs to be hands-free. Placement is critical — good lav technique dramatically affects sound quality.
Headset wireless — A small microphone element mounted on an earboom or headband. Popular in theater, corporate presentations, and live performance applications where consistent mic-to-mouth distance is critical.
Instrument wireless — Compact transmitters designed to clip onto an instrument or cable into a guitar/bass. Range and RF performance are typically optimized for stage environments.
How Many Channels Do You Need?
As a rule, always have one more wireless channel than you think you need. Technical issues happen, and having a spare ready to go can save a show.
Also factor in belt pack transmitters for in-ear monitor systems — each IEM system requires its own transmitter frequency, and these need to be coordinated with your microphone frequencies.
Shure vs. Sennheiser vs. Sony
The three dominant manufacturers for professional wireless are Shure (QLX-D, ULX-D, Axient Digital), Sennheiser (Evolution G4, Digital 6000, Digital 9000), and Sony (DWX series). All three produce world-class systems — the differences largely come down to specific RF performance characteristics, intermodulation handling, and user interface preferences.
Our inventory covers all three brands. Tell us your rider requirements and we'll spec the right system for your event.
