Tks, not sure what do you mean regarding Schiit Hel. I did take a look, this is just a DAC. Cosmos ADC is the simple USB(single Type-C, no extra power required) analog2digital convertor with 2 XLRs(1.7Vrms..10Vrms 8 steps DIP-switch) and one 2.5mm jack inputs(AUX 20..30Vrms to measure power amps). Mono/Stereo mode is switchable by UAC2 Volume(>50% of Windows volume slider means MONO, <50% STEREO). Mono mode gives 3db advantages for SNR, Dynamic Range(DR), and THD+N(aka sinad), for instance, DR in 2ch mode 124db(A), 1ch 127db(A), residual THD+N at 2ch mode -118-119db, 1ch <-121db etc. Each channel has Signal LED(Green for stereo, Blue for mono mode), and Clipping LED(Red). Max Fs 384kHz(frequency response +0.1/-3db 5Hz-190kHz), max bit depth 32bits PCM. Crosstalk -140db@1kHz.
PS: also attached Cosmos Analog Processing Unit, which contains Low Noise Amp(LNA balanced input with CMRR -120db, 140nVrms(A) 40/60db to measure DR/SNR of any imaginable monsters DACs), and notch filter 1/10kHz with residual THD+N -128db@1kHz, harmonics level -145db at 6Vrms input(-135db at 10Vrms, -155db or so at 1-2Vrms). Cosmos APU will be $75. In fact, calibrated Cosmos APU could be used with any laptop's audio inputs to measure so low levels of distortions. Super-duper ADC isn't required i.e. you can not measure the noise of Meizu HiFi DAC(~550nV(A)) with APx555b(~700nV(A)) because of the huge residual noise of AP analyzer but you can buy Cosmos APU for $75 and measure 550nV no problem