Addicted to Fun and Learning
- May 15, 2019
About your little divergence with @MC_RME :
I don't know for the RME ADI-2 DAC fs, but the RME ADI-2 Pro fs R performs up to the spec for THD+N at 32 ohm:
(Measured with RME ADI-2 Pro fs R 24dBu Mono mode as ADC, E1DA load board, software is Virtins Multi Instrument 18.104.22.168)
Specs says THD+N at 18dBu = -107dB, and I measured almost -110dB
6.0616 Vrms (17.9dBu) at 32.2 Ohm = 1.14W (Unbalanced)
I can push to -3.2dBFS in High Power mode with 32.2 ohm load before saturation.
That's a clean 1.37W. (Spec says 1.5W)
At -7dB, I get the 109dB SINAD @MC_RME is claiming:
At 300.3 Ohm, I can push it to max in Hi Power mode, for a voltage that reaches almost the promised 10V (22dBu) and 0.312W:
Thanks @Rja4000 for your measurements as well! I was able to clear this with @VintageFlanker already, by replicating his measurement using the Cosmos ADC. A simple grounding issue that made non-harmonics and a rising bass noise floor show up. No worries...