Well the Anthem AVM90 is much warmer especially when it’s turned on for 24hIf we look carefully, the AVM 90 beats the AVM 70 in SINAD mainly because of its much lower noise floor. In terms of distortion, audibility aside, I actually prefer the AVM 70 as it clearly has much lower higher order harmonics. It is academic though as we all know distortions at such low level is not much of a factor in terms of audibility. That's as long as people don't claim the 90 has a warmer sound haha (no one has yet)... The 2nd and 3 rd harmonics are probably about the same as the 90. It looks like the so called upgraded audio circuitry of the 90 succeeded in lower the noise, but not the distortions. Good to see that Amthem's claim wasn't just marketing hype.
This is assuming the RCA output is exactly 1/2 that of the XLR's output. That is a reasonable assumption (Amir said "I asked Anthem if the XLR output was derived from unbalanced and they said that was the case"), though it may still not be 100% sure as it could still somewhat depend on implementation.
On an other note what is the implications of VMRS? I am not an engineer so please explain it in plain English