ATS - 1 Dual DomainR but not a double field simulation, digital audio audio tester, and it also use AES3 / SPDIF digital interface and measure the characteristics, such as jitter.In my 2700 series instruments, ATS 1 architecture is a true double field.In the field of digital, the digital signal is used to the production and the measuring tools, it is used in digital audio measurement is extremely low distortion and the residual noise of tools.