esldude
500+ Head-Fier
- Joined
- Dec 8, 2001
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Made a GIF in Gimp. I copied the screenshots of the spectrums into layers in Gimp to make cropping them easier, so I just saved the result as a GIF too.
OP measured both a 30 Hz square wave (which shows the larger dip in the middle on balanced) and a 300 Hz square wave. I was discussing the 30 Hz one because the 300 Hz ones look practically the same.
Oops my bad. Somehow overlooked the 30 hz one.
Still pretty sure it is something transient unrelated to the equipment. If you look at the 15-17 second mark in both files you can see the low end noise is pretty much identical and lower than most of the balanced signal. The unbalanced stays generally lower in the low frequencies while the balanced one fluctuates though when quieted down is the same as the unbalanced. Look at the 20-23 second segment in both files which is in the 30 hz squarewave section and see that both have virtually identical noise floors at that point. The balanced is actually a touch lower there.