I listen to a lot of music... almost never in the Boxster. When I need critical listening I use an ipod and quality in ear monitors. Probably not legal... stuff happens. High end audio in a rag top sports car just seems out of place to me.
My Porsche listening tests:
Base stereo system is painful to listen to. Bose system is decent but not great. Favorite system in a Cayman had an Alpine head and Boston Acoustic high end speakers. It was marvelous.
All purely one drivers opinion.