New 2006 CTTS owner.

My radio and CDs sound fine.

The Sirius satellite radio sound is awful. Yes, I adjusted the sound to all possible combinations and it still sounds garbled.

My wife's XM in her Pilot is crystal clear. A friend said her Eclipse Sirius sounds great.

Is there a known problem with the 2006 Cayenne Sirius radio sound? Is there a fix?

Thanks in advance,
Bigfoot