Most have no idea how much noise effect‘s sound quality not until it’s reduced, moving from a big city high rise to a 50 year old house a couple years ago the battle to reduce RF , EMI noise continued even using a Puritan conditioner a Entech noise meter numbers dropped significantly however after extensive electrical upgrades were completed the conditioner left its own signature on the music most noticeable with a dac plugged into the conditioner.
It was easy to demonstrate plug the dac into the wall receptacle , dedicated line then switch into the conditioner first noticed transients we’re blunted I suppose if I spent more time farting around I’d find other sonic issues.
Optical fibre input is available in only some high priced dacs me thinks if dacs in the price range of the Gustard including for servers / streamers would be a large sonic leap forward . Up until recently I never liked the sound of internet radio it was sterile and dead sounding to me no matter the station I ended up using a 50 year old Marantz receiver tuner for FM broadcast during my entire work day . It was just recently a friend brought over a English Electric switch and replaced cat 8 cable , the differences in sound quality was really eye opening, all it did was reduce noise thats riding along with the signal right into your component though I am content with everything now the optical fibre route can wait .