My observations of better power (cabling) results in:
- Less EMI: more body and texture, sound appears more effortless in general, less choked.
- Less RFI: Clearer sound, less strident, blacker background, better detail, less fatigue
- General: More oomph and punch, fatter, rounder and tighter bass, a larger soundbubble (less distortion, which kills the 3D of your system).