- Thread Starter
- #41
Assuming company spec follows your argument that it is from CD, this is what they spec:Something really must have gone wrong, as an SPDIF-Receiver into AD1955 into LM4562 I/Vs and outputs should generate a nice and clean better than -110dB spectrum at 1kHz. I doubt Emotiva R&D and QC engineers would give the shown performance a pass.
LM4562 have a tendency to produce "popcorn" noise, maybe that's what we're seeing in one channel.
I can hardly accept the excuse of not having a test signal CD at hand as it takes no more than a few minutes to generate the files and burn them on CD (the player even takes data-CDs).
And this is what I got:
0.00195 in good channel versus 0.00150. Definitely in the same neighborhood.
The original request from member was to test the DAC and that is what I signed up to do. At the end, when I saw these results, I did think about spinning my test CD but found it broken as I reported. I only have one old computer left with CD drive. Not only do I have to create the tracks and burn them there, then I have to mess with AP software to measure in asych mode which is a pain to do. So I ran with what the member requested.
From past experience, these results only get worse anyway when you switch to 24 bit to 16 bit as the latter limits you to 93 dB SINAD.