According to the net, the Bose system in the Boxster 987 is meant to be really good with sound deadening added to the doors. Maybe have a look at that set up to see what they're doing right.
I always liked the Bose system in the Cayman, but it was almost always used for Radio 4, which is hardly demanding.
@hugo7 started
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According to the net, the Bose system in the Boxster 987 is meant to be really good with sound deadening added to the doors. Maybe have a look at that set up to see what they're doing right.