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.
@Brommers started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
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.