I use XM via a FM modulator and the sound quality is crappy compared to CD. In my BMW with factory Sirius, it's virtually CD-quality, but in the Boxster, over the FM band, the dynamic range is reduced (as I understand it), and just doesn't sound good. I really only use it for news therefore. And when I'm travelling, I have to change FM frequencies as I move from area to area, when I get interference from local stations. FM modulator is a poor solution. It makes me wish - funny - I had a cassette deck in-dash - so I could at least use the cassette adapter.
Until there's a MOST-bus connector/adapter, or the iPod connector, us with these newer cars are out of luck.
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