Hello,
does usage of *shielded* usb power cable make sense regarding
quality of sound from 3.5mm jack ?
...thanks
Re: shielded power cable
Probably not. It may be a good idea to put a ferrite bead on it though if you are having interference problems on the audio. Changing the power supply may fix it too -- switched mode power supplies all generate noise at about 1MHz, but some more than others. (1MHz may affect audio by generating mixing products at audio frequencies.) There's nothing you can do about that noise, because it isn't common-mode, other than changing the power supply or fitting some capacitors.