Digital Pilot Tone Technology
Cutting-edge digital pilot tone technology that fully eliminates frequency crosstalk between KTV rooms
Professional audio, microphones and system integration

Harmonai HK-833H Modified is a wireless dual microphone system engineered specifically for KTV and conference room applications. It operates in the UHF band using Phase-Locked Loop (PLL) frequency synthesis, delivering 100×2 independent channels with only 250 kHz channel spacing. The system integrates cutting-edge digital pilot tone technology to completely eliminate inter-room frequency crosstalk. Combined with automatic interference-free channel search, installation and deployment are fast and hassle-free.
The transmitter features 42-step adjustable output power, infrared auto-pairing, and a unique dual-boost design. Its aluminum body and integrated LCD display ensure both professional-grade engineering quality and user-friendly operation. With two wireless microphones paired to a single receiver, this system effortlessly covers more than 100 KTV rooms — making it an ideal choice for large-scale installations.
Cutting-edge digital pilot tone technology that fully eliminates frequency crosstalk between KTV rooms
Built-in feedback suppression circuitry for simplified setup and tuning
Automatic interference-free channel search function for faster, easier installation
UHF band
Phase-Locked Loop (PLL) frequency synthesis
100×2 channels
250 kHz
Two-stage high-performance RF filtering for excellent interference rejection
First IF uses SAW filter; second IF uses triple-ceramic filter
Specially designed mute circuit that fully eliminates pop noise during microphone power-on and power-off
Microphones use AA batteries
6–10 hours
Unique dual-boost design ensures consistent microphone performance even as battery voltage drops
Up to 50 meters or more in optimal conditions
Standard configuration includes LCD display and aluminum microphone body
42-step adjustable transmission power for flexible adaptation to diverse environments
Infrared auto-pairing: microphones instantly synchronize to the receiver’s operating channel upon power-on
KTV engineering-specific model — two microphones per single receiver enable seamless configuration across 100+ KTV rooms
This product is purpose-built for KTV entertainment venues and conference room systems, especially suited for:
• KTV Room Installations: Dual-microphone configuration with digital pilot tone anti-crosstalk technology enables one system to reliably serve multiple rooms — scalable to 100+ rooms.
• Conference Rooms / Multi-Function Halls: Operating range exceeding 50 meters plus automatic channel search meets wireless audio requirements for medium-to-large meeting spaces.
• Educational & Training Facilities: Built-in feedback suppression and mute circuitry allow stable operation without professional calibration — ideal for classrooms and training rooms.
• Small-Scale Performances / Event Hosting: UHF band combined with dual-boost design ensures signal stability; rugged aluminum microphone body ensures durability.
For detailed product information or bulk engineering quotations, contact the Harmonai professional team — we deliver customized audio solutions.