Audio quality: Cable vs. Satellite?

Is the audio of cable TV any less compressed than Satellite TV, or an old fashioned antenna, or is it all the same? My ears have tinnitus and that makes them particularly sensitive to digital harshness, which is coming through loud and clear from my satellite TV provider, DirectTV. Having a highly resolving audio system only makes the matter worse, as you hear that super crispness all the more. I am using an Aragon Soundstage and Arcam P7 amp, running only fronts and center. I have tried the audio outs from the satellite box to fronts only but it is no improvement. The harshness is there either way. I also tried a tube buffer, to no avail. Has anyone found a way to reduce this fatiguing harshness? Thanks