- Sep 20, 2018
Thanks for your time, @Rja4000!And then the resulting measurement
I tried to replicate your exact settings (same for tone generator but 2V, 2.5Vrms peak):
Honestly, I still have no clue what's the deal with the rise post-3Khz. So I tested my Matrix Mini-i Pro 3 (measured by Amir here), with its fixed balanced output (4.1Vrms):
Got weird numbers and the same rise. I'm not convinced either by the overall shape of the harmonic signature.
I also replicated your parameters with ARTA (for the Matrix, The Marantz is going back):
Back to RMAA, I re-measured the Matrix with both RMAA and Cosmos in mono-mode, with THD+N test set to 0dBFS (not my usual testing, the latter running in Stereo mode, and THD set to stock -3dB):
|THD + Noise, %|
|THD + Noise (A-weighted), %|
Oddly, the result seems much closer to what Amir get:
Bottom line is that the Marantz SACD seems to have a similar (but slight) "Hump" between -40dB and -25dB to what we've seen with ESS or other home-made DAC.
More investigation on this may be usefull, in my opinion...
Here is the Matrix :ADI-2 Pro FS into Cosmos ADC seems to produce this hump for me, as well:
(Cosmos in Stereo Mode) Same hump issue, as you said, so probably on the Cosmos. Besides, Amir measured this: