EMB JH3301 Wireless Unidirectional Headset Microphone System

The EMB JH3301 is a wireless unidirectional overhead headset microphone system designed for hands-free voice pickup. It combines a wearable microphone, transmitter, and receiver so a speaker can move without being tethered to a microphone cable. It is suited to voice-focused uses where the wearer needs both mobility and a consistent microphone position.

The lightweight adjustable headband positions the microphone for close, repeatable vocal capture. Its unidirectional design is intended to focus pickup toward the user’s voice rather than equally capturing sound from all directions. A moisture shield helps reduce perspiration reaching the microphone transducer during active use.

The microphone section is specified with a 100 Hz to 10 kHz frequency response, 600-ohm output impedance, and -72 dB sensitivity. These published figures describe a voice-oriented microphone system rather than a full-range music-production microphone. The wireless link operates in the VHF band on a stated 110–120 MHz carrier frequency.

The JH3301 has a stated effective working distance of 15 to 30 meters between transmitter and receiver. FM modulation is used for transmission, while the receiver provides a stated 0 to 400 mV audio output. The complete system response is listed as 50 Hz to 15 kHz.

For a basic portable or installed PA setup, the receiver can serve as the wireless front end for a compatible audio system. The supplied transmitter is powered by 9 V, and the receiver is specified for AC 220 V operation. Because connector type, battery format, and regional power accessories are not confirmed, those details should be verified before installation.

Key Features

• Hands-Free Headset Format: Keeps the microphone positioned while leaving the wearer’s hands available.
• Unidirectional Pickup: Focuses microphone pickup toward the user’s voice.
• Adjustable Lightweight Headband: Supports a personalized and stable wearing position.
• Moisture Shield: Helps protect the transducer from perspiration during use.
• VHF Wireless Link: Uses a stated 110–120 MHz carrier frequency.
• Complete Three-Piece System: Includes the microphone, transmitter, and receiver.

Design & Installation

The JH3301 uses a wearable overhead headset format with an adjustable, lightweight headband for hands-free vocal use. Its microphone assembly includes a moisture shield intended to help keep perspiration from reaching the transducer element. The published design information does not specify housing materials, connector type, or physical dimensions.

Wear the headset so the microphone remains consistently positioned near the mouth, then use the included transmitter and receiver as a matched wireless system. Keep the transmitter and receiver within the stated 15 to 30 meter working range, and connect the receiver’s audio output to compatible audio equipment after confirming the required input connection. The receiver is specified for AC 220 V power, while the transmitter uses a 9 V supply, so confirm local power compatibility before setup.