Grooved
Addicted to Fun and Learning
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- Feb 26, 2021
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Hi,intresting Gearspace topic (a shame DeltaWave page couldn't include all tests). Motus seams to be a very good value.
now if we make the loopback test balanced vs unbalanced aren't we testing how much diference the noise cancelation of the balanced conection makes? How do you know the output port is the culprid for the diference?
I was just surprised that the PKmetric result in DeltaWave for the 828MK2 was a lot lower than the 2408MK3 and 24I/0, as they all share the same DAC/ADC chips (it's doing both conversions) and pretty much the same design.
So I did test on one I have, and got 108 so about the same than the other two MOTU interfaces. Searching why it was lower in the results page, I saw that the file is called "asym", so suspected it was done in asymetric mode. I check with another file on Gearspace from another user and got the same result than mine, which confirmed that the first file in Gearspace for this Motu was recorded in asymetric/unbalanced.
The script used for measuring the files from Gearpsace in DeltaWave picks the first file for each interface, and unfortunately, the first for the 828MK2 was done in asymetric.
Now, like you said, it would be interesting to find why the PKmetric change a lot while the RMS difference is the same.
I will redo the loopback test with both unbalanced/balanced and analyse it.
It would be also interesting to test the file of this loopback test with the MOTU Ultralite MK5, if any owner can do it, it would great
EDIT : just checked on GS results and two people had send the recorded file with a MOTU Ultralite MK5, one in not available anymore, the other is, so I will check it too
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