Simulated Mouth KABR M903

Application Scenario: Sound source for acoustic measurement of microphones and transducersCompliance Standard: ITU-T Rec. P.51Frequency Range: Minimum SPL of 110dB re. 20μPa (100Hz - 10kHz)Distortion:

• < 1.5% (200Hz - 300Hz, 94dB SPL at MRP)

• < 1% (300Hz - 10kHz, 94dB SPL at MRP)Maximum Power: 15WOperation Mode: Active

The M903 Simulated Mouth is a sound source designed by Shenzhen Hongzhe Technology Co., Ltd. It is engineered to simulate the acoustic field environment of the human mouth and complies with international standards IEEE 269 and ITU-T Rec. P.51. Typically, it is used to test the frequency response of telephone microphones and communication microphones. The M903 features extremely high stability and low distortion, making it an ideal sound source for acoustic transducer testing.

The Reference Measurement Point (MRP) of the simulated mouth is located 35mm away from the mouth (with the lower lip ring removed). There are two methods for calibrating the mouth: 0° or 90° relative to the central axis of the simulated mouth. Using these two calibration methods, adjust the standard microphone and fix it firmly at the MRP for the calibration of the simulated mouth. Within the frequency range of 100Hz to 10kHz, the simulated mouth can generate a minimum continuous equalized signal of 100dB (re. 20μPa), and its loudspeaker receives external analog signals directly via BNC.