I think @erik_squires got it right. The issue with the wall warts isn't so much that they don't supply the necessary power, but whether the switching type are creating a backwash of noise in the rest of your system.
With the Schumann generator, though most folks that reviewed it favorably seemed to believe it did "more" by using a linear power supply, I didn't hear much difference. In fact, the whole notion of this component is borderline voodoo- nobody can explain why it does what it does. Some can't hear its effect at all. The first time I turned it on, it made me queasy. I then heard differences in the overall presentation of the system in my previous room/house/set up. In my new house/set up, I haven't found it to have much effect- it is a much bigger room and the placement isn't quite the same relative to the listening position. Perhaps a poor choice as an example, since it isn't a 'component' that is part of the system, but an external tweak.
Ditto on the difference with the little DSP unit for the subs. It's drawing a few hundredths of an amp, and I can see the voltage fluctuate between 12.0 and 12.1 on the bench supply read out. Maybe with a DAC or streamer that is essentially a source, it might make a difference in sound quality of the component itself, but my impression was that getting rid of the wart was due to potential noise pollution as it affected the rest of your system. Perhaps I'm wrong.....
With the Schumann generator, though most folks that reviewed it favorably seemed to believe it did "more" by using a linear power supply, I didn't hear much difference. In fact, the whole notion of this component is borderline voodoo- nobody can explain why it does what it does. Some can't hear its effect at all. The first time I turned it on, it made me queasy. I then heard differences in the overall presentation of the system in my previous room/house/set up. In my new house/set up, I haven't found it to have much effect- it is a much bigger room and the placement isn't quite the same relative to the listening position. Perhaps a poor choice as an example, since it isn't a 'component' that is part of the system, but an external tweak.
Ditto on the difference with the little DSP unit for the subs. It's drawing a few hundredths of an amp, and I can see the voltage fluctuate between 12.0 and 12.1 on the bench supply read out. Maybe with a DAC or streamer that is essentially a source, it might make a difference in sound quality of the component itself, but my impression was that getting rid of the wart was due to potential noise pollution as it affected the rest of your system. Perhaps I'm wrong.....