So, I'm now going to recommend these:
10x Topnisus 9mm Ferrites
for the power cable on DAVE. I am using 40 ferrites.
I've spent an hour or so comparing two mains cables of the same basic design (that comes with DAVE) and find that the cable with ferrites has a richer tonality and in musical terms makes it easier to follow individual instruments and comprehend lyrics. Some examples:
In Little Plastic Castle by Ani DiFranco the guitar at the start chimes more than it twangs and her voice has a slight guttural quality instead of being airy. Without the ferrites the guitar tends to sound more like a banjo and overall there's a feeling that lower harmonics in instruments and voices are victims of asceticism.
In Rag Sindhu Bhairavi by Ali Akbar Khan the physicality of both sarod and tabla is much more apparent. Comparatively the drum has mass and the strings have resistance, bringing out the expressiveness of the playing in a way that's hard to ignore. There's more grace and more deliberation in the playing, the dynamics and rhythms flowing back and forth sing and dance more freely.
I've had DAVE configured this way for over three months now and while I initially found no value in the addition of the ferrites, over the last 2 months or so I've been feeling that the nature of my system has changed, mostly a sense that there is more gravitas and physicality. So tonight I decided to find out.
Overall there is a sense of richness in the sound of instruments - it's not that the balance of the sound has become darker, more that lower harmonics are more present. This also seems to give more shape to notes, with a stronger sense from transients such as plucks or beats. But this goes both ways, so that notes that are lightly or softly played are more different from notes that are heavily or firmly played.
The 9mm inner diameter ferrites fit tightly on the mains cable that comes with DAVE, without being difficult to "click" them shut, though a kink in the cable will give a bit of trouble. All the ferrites should be close to DAVE.