Yes they are mostly IMHO "unnecessary klutzy weight" In my experience if there is any interference you will certainly hear it in the output very quickly. All devices generate noise whether they are battery powered or not, it really down to how well those devices isolate their outputs from noise and how good their RF screening is.Yes sorry , it was aimed at you. I messed up the part-quote somehow.
If there is a possiblity to get better usb sound quality through some simple gadgets, I'm all for it. I've see pictures of guys using ifi usb noise suppressors and 2 of those large ferret magnets.
Does that actually increase quality or is it mostly unneccesary klutzy weight?
I have some old Ferrits, but the ifi is too expensive for a questionable improvement.
Shouldnt' there be very low noise and distortion on purely battery powered systems anyway , vs a wall plugged (interferences ?) Desktop amp
I think for 90% of the devices out there you have nothing to worry about.