Yeah, I am suspecting it is the cable (RCA to XLR) that caused the noise issue. But I have no other way to connect my E30 to the ADC
That's true, then my question is why I got better separation of stereo effect when I powered my DAC with batteries rather than linear power supply? Is it no relationship with the power noise?That was half the the test. The other half compared presumably dirty AC coming out of the wall against lab generated power with three audio devices and no difference whatsoever was found. This is on top of prior testing of power conditioners showing the same.
Rule #1 of any premium cutters like Knipex to never use it on electrical wiring. It is way too hard on them. I have electricians cutters that I use for that.
I know. I am signing the checks regularly for test services. Meaningless wrt audio equipment. Is no indication of meaningful performance.
Or maybe you are quoting something you have no personal experience with and have never done for a piece of audio equipment or you would know it's rather meaningless w.r.t. a valid audiophile test.
I wanted to check a new headphones amp just now. I tried to check 1khz tone using E30 in my computer room and I couldn't get good THD plus noise result. Always very high noise level in the -50db. It sounded ok, but the noise level as measured by REW RTA bugs me. Something is not quite right. Maybe using RCA to XLR adapter to connect to the ADC is the problem.....So my captures from yesterday may not be quite right....
Absolutely. Lab conditions usually are quite different from the millions of configurations hifi system owners actually use.
On my side, I noticed the D90se is built using a CE compliant SMPS. I assume the D90se is CE compliant also.
Only the SMPS module is CE certified. Using that doesn't mean the device it is used in is also certified.
The entire device needs to be certified as well. There are more ports than just the power port that needs to be tested.
There are no meaningful wrt high performance audio pass/fail criteria.
Have a look at the D90se. A close look. You may so also see its output stages / lines buffers.