VintageFlanker, hey it seems you deserve to get a preproduction E1DA Cosmos APU free sample(the other two samples go to Archimago, and StaticV3 as usual), as a beta tester, if you never mind.
Analog Processing Unit contains Low Noise Amplifier 140nVrms(A) i.e. about 6x times less vs APx555b. You can measure SNR or DR(140db++) of any DAC on the market. Just by the way the LNA section contains 48V phantom power and may work with a condenser mic preamp(Neumann, AKG, Rode etc) as well. Another half of APU is the notch filter 1/10kHz that may see distortions-harmonics as low as -150db and less. Its residual THD+N@1kHz <-130db i.e. at least 2x times lower than APx555b. I think you could be one of the first people who'll measure ES9038Pro based DAC properly. Actually, APx555b isn't able to measure even a cheap CS43131 SNR/DR and will show 123db(A) instead of Cirrus promised -130db(A), APU shows -130.5db(A)