1. Adjust parameters with a color LCD display and powered by a wide voltage power supply of 110V-240V.

3. Dual stereo auxiliary input (Aux In) for local audio playback; dual line input (Line In) for remote signal input during interactive teaching; dual line output (Line Out) for remote signal output during interactive teaching; dual mixed signal output (REC Out) for connecting to an amplifier or recording equipment.

6. Equipped with optional USB or RJ45 network port communication interface, flexible usage.

6. Built-in Active Noise Cancellation (ANC) filters out background noise from the environment without affecting the high-quality transmission of voice signals, enhancing the signal-to-noise ratio and improving sound quality.

8. Built-in digital high-pass and low-pass control, allowing for adjustable voice frequency response range.

10. Built-in 10-band digital graphic equalizer: frequency control.

12. Keyboard Lock Function: After the admin finishes debugging the device, lock the panel buttons to prevent unauthorized operation by non-administrators.

14. Stores 5 debugging modes for easy access during mass installations and debugging.

16. Capable of connecting to a fixed 100V signal for convenient emergency broadcasting.

Technical Specifications of Main Unit NL3000B

2): Microphone Input Level -40dB

4): Low-pass Frequency Characteristics 5KHz-20KHz

6): Microphone Frequency Response: 50Hz ~ 18KHz (-3dB, when bandpass is off)

8): Distortion ≤0.1% DSP Processor ≤0.065% (1KHz/0dB)

10): Microphone Gain Enhancement ≥ 8 dB

12): Line Input Level 0dB

14): Setpoint Input Level 100V

16): Dimensions: 235mm x 205mm x 50mm

Available with software settings for debugging and control via USB or network interface (optional).