Quality of Sirius XM

I recently started streaming Sirius XM in my barroom. I’ve noticed sound quality differences between my Roon DB, Pandora, Sirius XM and a few other sources. The sound quality varies quite a bit. I just assume that Sirius XM is streaming at a compressed rate. Don’t know that to be true, though. Not sure if the satellite feed sound quality is different than what is streaming over the internet. 

Can anyone shed some light on this for me?

Thanks in advance. 


Considering the quality of their "stream" and the amount they charge, it is probably the worst offering imaginable in audio.

Sirius XM rolls off the high end substantially & overall sounds terrible in even a decent system. A Good FM signal can be much better. 

I had it in the car, I think they overcook a MP3 quality sound into a fake HI-REZ sound that sounded artificial.