In scenes such as stage performances and lecture meetings, wireless microphones have become the first choice for audio capture because of their convenience and flexibility.
However, no matter how advanced the equipment is, if the frequency is not chosen properly, signal interference, crosstalk and other problems will seriously affect the recording quality.
Therefore, the SYNCO team spent a week creating a guide to bring you an easy understanding of what is the best frequency for wireless microphones.
Here are the 4 best frequency band for wireless mics:
- 470 - 500 MHz (UHF band)
- 500 - 600 MHz (UHF band)
- 2.4GHz (ISM band)
- 2.4GHz/5.8GHz (auto hopping)
However, they are each best suited for different occasions, so let's find out now!
Introduction
Wireless frequency, i.e., the frequency band of radio wave propagation, is the “channel” for wireless microphones to transmit audio signals.
At present, the mainstream wireless microphone frequency band mainly includes the following:
👉 VHF band (Very High Frequency): 174 - 216 MHz
Early, commonly used, strong penetration, but the band is crowded. The risk of interference is high but has been gradually eliminated.
👉 UHF band (Ultra High Frequency): 470 - 698 MHz (USA.)
Currently, the most mainstream frequency band, signal stability, long transmission distance, and strong anti-interference ability.
👉 ISM band (2.4 GHz/5.8 GHz): global, license-free
digital microphone common frequency band, but with WiFi, Bluetooth and other shared frequencies, interference probability is higher.
| Frequency Bands | Pros | Cons | Scenarios |
| 174–216 MHz (VHF) | Strong penetration, good compatibility with old devices | Vulnerable to interference from TV broadcasts | Basic conference, school teaching |
| 470–698 MHz (UHF) | Good stability, low latency, many channels | Local regulations need to be complied with | Professional filming, stage performance |
| 2.4 GHz (ISM) | Global availability, easy to set up | Shared WiFi bands, weak interference immunity | Lightweight live broadcast, vlog filming |
| 5.8 GHz (ISM) | High resistance to WiFi interference | Close proximity, significant wall obstruction | Indoor short distance use |
In general, digital systems usually use the 2.4GHz or 5.8GHz bands, which are highly resistant to crosstalk.
Analog systems, on the other hand, are mostly found in the UHF band, which has low latency but is susceptible to interference from surrounding radio waves.
But what is the best frequency for wireless microphones? Let's move on.
What Is The Best Frequency Range For Wireless Microphones?
Best Wireless Mic Frequency For Crowded Rooms: 470-500 MHz (UHF Band)
In crowded indoor venues such as exhibitions, live presentations, large events or weddings, the biggest challenge facing wireless microphones is signal conflict and environmental interference.
These environments are often crowded with WiFi routers, Bluetooth devices, camera mapping systems, and other audio-electronic devices, creating an extremely complex electromagnetic environment.
It is prone to wireless signal interference, resulting in unstable audio transmissions or interrupted connections.
The 470-500 MHz mid-low frequency range in the UHF band is currently the most recommended frequency range for such occasions.
Unlike the 2.4 GHz band, UHF 470-500 MHz is rarely occupied by WiFi or consumer Bluetooth devices, resulting in a cleaner signal and lower risk of interference.
At the same time, this frequency band has stronger signal penetration ability.
It can better pass through crowds, walls, stage installations and other obstructions, effectively reducing the signal attenuation and broken links caused by obstructions.
Best Frequency Range For Wireless Mics In large-Scale Stage: 500-600 MHz (UHF Band)
In professional environments such as large-scale stage performances, theater performances, wedding recordings, or film productions where sound quality and signal stability are critical, choosing the right wireless microphone frequency is crucial.
The current widely recognized preferred frequency band is the UHF band in the 500-600 MHz range.
This frequency band has excellent anti-interference ability and can effectively resist the signal impact from WiFi, Bluetooth and other consumer-grade devices to provide clear and stable audio transmission for demanding recording and sound reinforcement.
At the same time, this frequency range supports the parallel use of multi-channel systems under the premise of reasonable frequency spacing, which can effectively avoid intermodulation interference.
In Globally Used Or Tightly Regulated Areas Of The Spectrum: 2.4GHz (ISM Band)
The 2.4GHz ISM band is a widely adopted solution in areas where cross-border use is required or where spectrum regulation is more stringent, such as in some Asian countries, airports, trade show venues, or temporary events.
This band is a globally open and license-free band, and users do not need to apply for spectrum authorization or hold professional licenses, greatly reducing deployment thresholds and compliance risks.
At the same time, 2.4GHz-based lavalier lapel microphone wireless often have the advantage of being plug-and-play, and the tuning process is much simpler for non-professional users to get started quickly.
In Noisy Environments/High Signal Interference Areas: 2.4GHz/5.8GHz (Automatic Frequency Hopping)
In noisy areas with serious airwave interference, such as backstage at concerts, exhibition sites or near city broadcasting towers, the choice of 2.4GHz/5.8GHz with automatic frequency hopping is crucial.
Among them, the 5.8GHz band channel is relatively clean and has obvious advantages in avoiding regular interference, especially for high-density scenarios within short and medium distances.
However, due to the relatively weak penetration ability of high-frequency signals, it is more suitable for unobstructed or close-range use.
In contrast, the 2.4GHz band with automatic frequency hopping can quickly switch between multiple channels and find clean signal paths in real-time.
It effectively avoids signal blockage or conflicts, thus guaranteeing the continuity and clarity of audio transmission.
For users working in high-interference environments, the 2.4GHz/5.8GHz band is undoubtedly the most suitable.
Frequency Use Regulations In The United States
In the U.S., the Federal Communications Commission (FCC) has strict regulations on the use of wireless microphones in the frequency band.
Especially in the 600 MHz band (614-698 MHz), which has been divided for other wireless services, it is now completely prohibited for civilian wireless microphones to continue to use this band.
Users need to pay special attention when purchasing equipment to avoid facing signal interference or regulatory penalties for using illegal frequency bands.
Currently, the FCC recommends using the UHF band between 470-608 MHz, provided that the microphone equipment used is certified to operate in the legal frequency range.
How Far Apart Do The Frequencies Have To Be Without Interfering With Each Other?
When using multiple wireless microphone systems, in order to avoid mutual interference, each set of devices should be separated by at least 0.25 MHz to 1 MHz or more.
It depends on the type of devices used, the frequency band, and the complexity of the site environment.
However, if you want a more stable system with less interference, a separation of 5-10 MHz or more is recommended.
Conclusion
The above results are derived from what is the best frequency for wireless microphones reddit reviews and actual test feedback.
The final choice also needs to take into account the usage scenario, the type of device, and local regulations.
Suppose you need to use the device in a 2.4GHz high-interference environment.
In that case, it is recommended to choose a wireless system with frequency hopping technology and digital anti-interference algorithms.
Suppose you are on the set for a large-scale performance or movie shooting.
In that case, you should prioritize a high-performance UHF microphone system and plan the frequency spacing wisely to ensure no interference and no dropouts.
If you have other questions about wireless lav mic and other microphones, feel free to contact SYNCO as well!