Digital Signal Processor controls the entire system is for reliable, quick and easy audiometric exploration of hearing thresholds and screening tests, such as suprathreshold pure tone tests. The SIBELSOUND 400, is a revolutionary two channel audiometer. SIBEL, S.A.'s RDI department in collaboration with the Surgery Department (Ear, Nose and Throat and Audiology) of the University of Barcelona and well-known specialists in the field, in accordance with standard criteria of both national institutions such as the UNE and international institutions such as the IEC, ISO, developed this device. Key Aspects Connectivity: It is connected with other management systems. . Musical Frequencies: It is one of the features of the product. Frequency: The device has a high frequency. Tests: One thousand tests alongwith Supra threshold test is conducted to record the information in Internal database. Calculation and Diagnosis: It calculates and diagnosis the hearing loss. Technology: Advanced digital technology is based on DSP.