Main features: ◆ use 40kHz, 24 bit digital / simulation and simulation / digital converter, generating a signal and perform tests ◆ Frequency and impedance measurement frequency regulator Festival resolution ◆ Frequency and impedance curve with automatic delay correction phase calculation ◆ acoustic measurements In addition to measuring the phase distortion correction line ◆ group delay line in addition to the phase group delay calculation ◆ transient response and the cumulative spectral decay (waterfall) ◆ frequency response curve of the free audio distortion measurements Yang Diao letter correcting any internal ◆ ◆ external signal frequency ◆ distortion and frequency, level assessment ◆ intermodulation distortion measurements: Tim and Dim ◆ Thiele small parameters to calculate the maximum frequency resolution 0.1Hz ◆ ◆ with speaker-aided design software Akabak, CALSOD and LEAP supporting the use of narrowband noise ◆ ◆ RT60 automatic test macro editor, Go / No Go to drive point determined ◆ Dial test points test performance specifications: Software: it uses 16-bit or 24-bit D / A and A / D converter to generate the test signals and to calculate the test signal, and calculated by the graphical interface test curve, the title kind of information like composition, simple and intuitive graphical user test function menu prompts to make your measurements handy. Hardware 1) DAAS4Pro: PCI4 bit 2-channel analog / digital, after digital / analog conversion stage common control box card (including the power amplifier and the preamplifier power supply phantom MIC) Microphone (15V or 48V) 2) DAAS4usb: before and after the USB interface level control box (including the power amplifier and preamp phantom power MIC) Microphone (15V or 48V) DAAS4 pro frequency response can be implemented in software via an optional QC Extension, polarity, impedance, harmonic distortion, friction & buzzer, the average sensitivity Online quality control functions, and all test results can be used directly to generate Excel reports for quality analysis.