Receiving Frequency Range
640–690 MHz
Product Overview
The Harmonai MR20 UHF dual-channel lavalier microphone system is a professional-grade wireless conference microphone solution operating in the UHF 640–690 MHz band with FM modulation. It features dual-channel transmitters and a high-sensitivity receiver. With an SNR exceeding 105 dB, dynamic range over 100 dB, and total harmonic distortion under 0.5%, it delivers clear, pristine audio transmission—perfect for conferences, speeches, and classroom instruction.
Receiver Sensitivity
−94 dBm (30 dB)
Image Rejection
>60 dB
Frequency Stability
±0.005%
Modulation Method
FM
Maximum Frequency Deviation
±45 kHz
Audio Response
50 Hz–18 kHz (+3 dB)
Signal-to-Noise Ratio (SNR)
>105 dB
Dynamic Range
>100 dB
Total Harmonic Distortion (THD)
<0.5%
Transmitter Output Power
30 mW
Maximum Input Sound Pressure Level (SPL)
130 dB SPL
Receiver Power Supply
12 V / 1 A
Transmitter Power Supply
2 × 1.5 V AA batteries
Operating Temperature
−10°C to 55°C
Applications
The Harmonai MR20 UHF wireless lavalier microphone system is widely used in business meetings, academic lectures, training sessions, wedding hosting, and live performances. Its dual-channel ‘one-receiver–two-transmitters’ design supports two speakers simultaneously without interference. The UHF band offers strong anti-interference performance, while the compact, discreet lavalier transmitter ensures comfortable, unobtrusive wear—making it an ideal choice for professional audio recording and broadcasting.
Contact us for detailed Harmonai MR20 specifications or bulk procurement pricing—we’re ready to support you with expert audio solutions.
Harmonai ACT-518 Dual-Channel True Diversity Wireless Microphone
The Harmonai ACT-518 is a professional dual-channel true diversity wireless microphone system with PLL frequency synthesis and infrared auto-sync, delivering stable transmission up to 500 meters in open spaces. Two mics operate simultaneously without interference, powered by two AA batteries for ~8 hours.$20.63
Harmonai Relay Amplifier – Professional UHF Antenna Distribution Amplifier for Wireless Microphone Systems
The Harmonai Relay Amplifier is a signal-boosting device designed specifically for wireless microphone antenna distribution systems. It extends transmission distance, reduces signal attenuation, and supports simultaneous connection of multiple receivers for stage performances, conference systems, and broadcast studios.$65.00
Harmonai XTA448(24version) Digital Audio Processor — High-Value Export Edition
The Harmonai XTA448(24version) is an export-focused digital audio processor that builds on the proven XTA448 22-version architecture—delivering improved sound quality while removing AES functionality to maximize value for entry-level professional applications.$280.69
XTA448 Digital Audio Processor (22 Version) — Domestic Alternative, High-Value DSP
The XTA448 (22 Version) is Harmonai’s next-generation digital audio processor (DSP), featuring select high-quality domestic OEM components while delivering 1:1 functional fidelity and outstanding sound quality — an ideal high-value solution for professional audio processing.$275.38
Harmonai A2D XY Microphone Stand
Harmonai A2D XY Microphone StandContact for price
Harmonai A4D Microphone Stand Adapter
Harmonai A4D Microphone Stand AdapterContact for price
Harmonai A35 Monitor Accessories
Harmonai A35 Monitor AccessoriesContact for price
Harmonai KK3 Adapter
KK3 Adapter - Contact us for pricingContact for price
Harmonai PSM920 Wireless In-Ear Monitor
PSM920 Wireless In-Ear Monitor - Contact us for pricingContact for price
Harmonai A02 U28 Desktop Broadcast Microphone
A02 U28 Desktop Broadcast Microphone - Contact us for pricingContact for price
Harmonai P17 Condenser Microphone
P17 Condenser Microphone - Contact us for pricingContact for price