I'm going to add to my above comment. With XM, the sound quality is lack luster. However, if you steam in hi-res audio such as Qubuz, the sound system actually sounds pretty good. I feel it is a bit short on bass, but in all fairness speakers need to break in. My KEF home speakers took 2-3 months to fully break in, and my Alfa Romeo Stelvio took almost 15,000 miles of driving for the subwoofer to fully break in. So at 1500 miles in the ST, I'm sure it will sound better as time goes on.