Lexus, or any other OEM, has no control over the audio quality supplied by Sirius XM. As I alluded to in my post above in order for Sirius XM to provide so many channels of programming, and because their satellite has finite bandwidth, they find it necessary to bandwidth limit each channel of programming, vary the bitrates, and use a lossy compression algorithm. Because of this you will hear the limits as some are describing and are trying to correct for in their eq. To be clear the perceived lack of audio quality with their ML system when listening to Sirius XM programming is not an issue with the ML sound system but merely a consequence of the source. Doc, you have also described, as I speculated, that with higher quality sources and transports the ML system is actually quite good relatively speaking to the cost and environment that bounds it.
